A flaw was found in dnsmasq before version 2.83. When getting a reply from
a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the
forwarded query that matches the reply, by only using a weak hash of the
query name. Due to the weak hash (CRC32 when dnsmasq is compiled without
DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find
several different domains all having the same hash, substantially reducing
the number of attempts they would have to perform to forge a reply and get
it accepted by dnsmasq. This is in contrast with RFC5452, which specifies
that the query name is one of the attributes of a query that must be used
to match a reply. This flaw could be abused to perform a DNS Cache
Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a
successful attack is reduced. The highest threat from this vulnerability is
to data integrity.
{"osv": [{"lastseen": "2022-12-08T07:35:00", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T16:15:00", "type": "osv", "title": "CVE-2020-25685", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685"], "modified": "2022-12-08T07:34:55", "id": "OSV:CVE-2020-25685", "href": "https://osv.dev/vulnerability/CVE-2020-25685", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2022-08-10T07:15:50", "description": "\nMoshe Kol and Shlomi Oberman of JSOF discovered several\nvulnerabilities in dnsmasq, a small caching DNS proxy and DHCP/TFTP\nserver. They could result in denial of service, cache poisoning or the\nexecution of arbitrary code.\n\n\nFor the stable distribution (buster), these problems have been fixed in\nversion 2.80-1+deb10u1.\n\n\nWe recommend that you upgrade your dnsmasq packages.\n\n\nFor the detailed security status of dnsmasq please refer to\nits security tracker page at:\n[\\\nhttps://security-tracker.debian.org/tracker/dnsmasq](https://security-tracker.debian.org/tracker/dnsmasq)\n\n\n", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "baseScore": 8.1, "privilegesRequired": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "userInteraction": "NONE", "version": "3.1"}, "impactScore": 5.9}, "published": "2021-02-02T00:00:00", "type": "osv", "title": "dnsmasq - security update", "bulletinFamily": "software", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "COMPLETE", "integrityImpact": "PARTIAL", "baseScore": 8.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 8.5, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25687", "CVE-2020-25685", "CVE-2020-25681", "CVE-2020-25683", "CVE-2020-25682", "CVE-2020-25686"], "modified": "2022-08-10T07:15:45", "id": "OSV:DSA-4844-1", "href": "https://osv.dev/vulnerability/DSA-4844-1", "cvss": {"score": 8.3, "vector": "AV:N/AC:M/Au:N/C:P/I:P/A:C"}}], "alpinelinux": [{"lastseen": "2023-12-03T16:03:17", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T16:15:00", "type": "alpinelinux", "title": "CVE-2020-25685", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685"], "modified": "2023-11-07T03:20:00", "id": "ALPINE:CVE-2020-25685", "href": "https://security.alpinelinux.org/vuln/CVE-2020-25685", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T16:03:17", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T16:15:00", "type": "alpinelinux", "title": "CVE-2020-25684", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2023-11-07T03:20:00", "id": "ALPINE:CVE-2020-25684", "href": "https://security.alpinelinux.org/vuln/CVE-2020-25684", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T16:03:17", "description": "A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T17:15:00", "type": "alpinelinux", "title": "CVE-2020-25686", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25686"], "modified": "2023-11-07T03:20:00", "id": "ALPINE:CVE-2020-25686", "href": "https://security.alpinelinux.org/vuln/CVE-2020-25686", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "prion": [{"lastseen": "2023-11-22T01:31:07", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}}, "published": "2021-01-20T16:15:00", "type": "prion", "title": "Design/Logic Flaw", "bulletinFamily": "NVD", "cvss2": {"severity": "LOW", "exploitabilityScore": 4.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "HIGH", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 2.6, "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685"], "modified": "2023-11-07T03:20:00", "id": "PRION:CVE-2020-25685", "href": "https://www.prio-n.com/kb/vulnerability/CVE-2020-25685", "cvss": {"score": 2.6, "vector": "AV:N/AC:H/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-11-22T01:31:07", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}}, "published": "2021-01-20T16:15:00", "type": "prion", "title": "Design/Logic Flaw", "bulletinFamily": "NVD", "cvss2": {"severity": "LOW", "exploitabilityScore": 4.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "HIGH", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 2.6, "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2023-11-07T03:20:00", "id": "PRION:CVE-2020-25684", "href": "https://www.prio-n.com/kb/vulnerability/CVE-2020-25684", "cvss": {"score": 2.6, "vector": "AV:N/AC:H/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-11-22T01:31:07", "description": "A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}}, "published": "2021-01-20T17:15:00", "type": "prion", "title": "Design/Logic Flaw", "bulletinFamily": "NVD", "cvss2": {"severity": "LOW", "exploitabilityScore": 4.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "HIGH", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 2.6, "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25686"], "modified": "2023-11-07T03:20:00", "id": "PRION:CVE-2020-25686", "href": "https://www.prio-n.com/kb/vulnerability/CVE-2020-25686", "cvss": {"score": 2.6, "vector": "AV:N/AC:H/Au:N/C:N/I:P/A:N"}}], "redhatcve": [{"lastseen": "2023-12-04T00:29:35", "description": "A flaw was found in dnsmasq. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.\n#### Mitigation\n\nThe impact of this flaw can be reduced by disabling the dnsmasq cache by adding `--cache-size=0` when calling dnsmasq or by adding a line with `cache-size=0` to the dnsmasq configuration file (/etc/dnsmasq.conf by default). \n\n\nWhen using Red Hat Enterprise Linux 8.3 with libvirt through a virt:rhel module, use `virsh net-edit <network-name>` and reference <https://libvirt.org/formatnetwork.html#elementsNamespaces> to add the suggested option `cache-size=0`. \n\n\nThere is no way to customize the dnsmasq configuration generated by libvirt, when using versions of Red Hat Enterprise Linux prior to version 8.3. If dnsmasq is being run through NetworkManager, create a new file in /etc/NetworkManager/dnsmasq.d/ and add `cache-size=0` to it. \n\n\nIn all cases, by disabling the cache, you may experience a performance loss in your environment due to all DNS queries being forwarded to the upstream servers. Please evaluate if the mitigation is appropriate for the system\u2019s environment before applying. \n\n", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-19T12:18:11", "type": "redhatcve", "title": "CVE-2020-25685", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685"], "modified": "2023-08-31T16:00:44", "id": "RH:CVE-2020-25685", "href": "https://access.redhat.com/security/cve/cve-2020-25685", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-04T00:29:35", "description": "A flaw was found in dnsmasq. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.\n#### Mitigation\n\nThe impact of this flaw can be reduced by disabling the dnsmasq cache by adding `--cache-size=0` when calling dnsmasq or by adding a line with `cache-size=0` to the dnsmasq configuration file (/etc/dnsmasq.conf by default). \n\n\nWhen using Red Hat Enterprise Linux 8.3 with libvirt through a virt:rhel module, use `virsh net-edit <network-name>` and reference <https://libvirt.org/formatnetwork.html#elementsNamespaces> to add the suggested option `cache-size=0`. \n\n\nThere is no way to customize the dnsmasq configuration generated by libvirt, when using versions of Red Hat Enterprise Linux prior to version 8.3. If dnsmasq is being run through NetworkManager, create a new file in /etc/NetworkManager/dnsmasq.d/ and add `cache-size=0` to it. \n\n\nIn all cases, by disabling the cache, you may experience a performance loss in your environment due to all DNS queries being forwarded to the upstream servers. Please evaluate if the mitigation is appropriate for the system\u2019s environment before applying. \n\n", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-19T14:57:23", "type": "redhatcve", "title": "CVE-2020-25684", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2023-08-31T16:00:34", "id": "RH:CVE-2020-25684", "href": "https://access.redhat.com/security/cve/cve-2020-25684", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-04T00:29:36", "description": "A flaw was found in dnsmasq. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.\n#### Mitigation\n\nThe only known way to mitigate this flaw is to disable DNSSEC altogether, by removing the `--dnssec` command line option or the `dnssec` option from dnsmasq configuration file. \n\n", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 8.1, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-01-19T12:18:18", "type": "redhatcve", "title": "CVE-2020-25681", "bulletinFamily": "info", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "COMPLETE", "integrityImpact": "PARTIAL", "baseScore": 8.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 8.5, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25681", "CVE-2020-25682", "CVE-2020-25683", "CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2020-25687"], "modified": "2023-04-06T07:32:33", "id": "RH:CVE-2020-25681", "href": "https://access.redhat.com/security/cve/cve-2020-25681", "cvss": {"score": 8.3, "vector": "AV:N/AC:M/Au:N/C:P/I:P/A:C"}}, {"lastseen": "2023-12-04T00:29:39", "description": "A flaw was found in dnsmasq. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.\n#### Mitigation\n\nThe impact of this flaw can be reduced by disabling the dnsmasq cache by adding `--cache-size=0` when calling dnsmasq or by adding a line with `cache-size=0` to the dnsmasq configuration file (/etc/dnsmasq.conf by default). \n\n\nWhen using Red Hat Enterprise Linux 8.3 with libvirt through a virt:rhel module, use `virsh net-edit <network-name>` and reference <https://libvirt.org/formatnetwork.html#elementsNamespaces> to add the suggested option `cache-size=0`. \n\n\nThere is no way to customize the dnsmasq configuration generated by libvirt, when using versions of Red Hat Enterprise Linux prior to version 8.3. If dnsmasq is being run through NetworkManager, create a new file in /etc/NetworkManager/dnsmasq.d/ and add `cache-size=0` to it. \n\n\nIn all cases, by disabling the cache, you may experience a performance loss in your environment due to all DNS queries being forwarded to the upstream servers. Please evaluate if the mitigation is appropriate for the system\u2019s environment before applying. \n\n", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-19T12:18:42", "type": "redhatcve", "title": "CVE-2020-25686", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25686"], "modified": "2023-08-31T16:00:58", "id": "RH:CVE-2020-25686", "href": "https://access.redhat.com/security/cve/cve-2020-25686", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "cve": [{"lastseen": "2023-12-03T15:43:52", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T16:15:00", "type": "cve", "title": "CVE-2020-25685", "cwe": ["CWE-326"], "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685"], "modified": "2023-11-07T03:20:00", "cpe": ["cpe:/o:debian:debian_linux:10.0", "cpe:/o:fedoraproject:fedora:32", "cpe:/o:fedoraproject:fedora:33"], "id": "CVE-2020-25685", "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25685", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}, "cpe23": ["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*", "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"]}, {"lastseen": "2023-12-03T15:43:54", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T16:15:00", "type": "cve", "title": "CVE-2020-25684", "cwe": ["NVD-CWE-Other"], "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2023-11-07T03:20:00", "cpe": ["cpe:/o:debian:debian_linux:10.0", "cpe:/o:fedoraproject:fedora:32", "cpe:/o:fedoraproject:fedora:33", "cpe:/o:debian:debian_linux:9.0"], "id": "CVE-2020-25684", "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25684", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}, "cpe23": ["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*", "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"]}, {"lastseen": "2023-12-03T15:43:53", "description": "A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T17:15:00", "type": "cve", "title": "CVE-2020-25686", "cwe": ["CWE-358"], "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25686"], "modified": "2023-11-07T03:20:00", "cpe": ["cpe:/o:debian:debian_linux:10.0", "cpe:/o:fedoraproject:fedora:32", "cpe:/o:fedoraproject:fedora:33"], "id": "CVE-2020-25686", "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25686", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}, "cpe23": ["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*", "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"]}], "debiancve": [{"lastseen": "2023-12-03T18:24:36", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T16:15:00", "type": "debiancve", "title": "CVE-2020-25685", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685"], "modified": "2021-01-20T16:15:00", "id": "DEBIANCVE:CVE-2020-25685", "href": "https://security-tracker.debian.org/tracker/CVE-2020-25685", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T18:24:36", "description": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T16:15:00", "type": "debiancve", "title": "CVE-2020-25684", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2021-01-20T16:15:00", "id": "DEBIANCVE:CVE-2020-25684", "href": "https://security-tracker.debian.org/tracker/CVE-2020-25684", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T18:24:36", "description": "A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-20T17:15:00", "type": "debiancve", "title": "CVE-2020-25686", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25686"], "modified": "2021-01-20T17:15:00", "id": "DEBIANCVE:CVE-2020-25686", "href": "https://security-tracker.debian.org/tracker/CVE-2020-25686", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "thn": [{"lastseen": "2022-05-09T12:39:12", "description": "[](<https://thehackernews.com/images/-4JMeeulG8oc/YAbH6K-iByI/AAAAAAAABhs/PM1FhHhjD-ItL0VUT0-mvF5-e0V6BdKHQCLcBGAsYHQ/s0/dns-security.jpg>)\n\nCybersecurity researchers have uncovered multiple vulnerabilities in Dnsmasq, a popular open-source software used for caching Domain Name System (DNS) responses, thereby potentially allowing an adversary to mount DNS [cache poisoning attacks](<https://www.cloudflare.com/learning/dns/dns-cache-poisoning/>) and remotely execute malicious code.\n\nThe seven flaws, collectively called \"**DNSpooq**\" by Israeli research firm JSOF, echoes previously disclosed weaknesses in the DNS architecture, making Dnsmasq servers powerless against a range of attacks.\n\n\"We found that Dnsmasq is vulnerable to DNS cache poisoning attack by an off-path attacker (i.e., an attacker that does not observe the communication between the DNS forwarder and the DNS server),\" the researchers noted in a report [published](<https://www.jsof-tech.com/disclosures/dnspooq/>) today.\n\n\"Our attack allows for poisoning of multiple domain names at once, and is a result of several vulnerabilities found. The attack can be completed successfully under seconds or few minutes, and have no special requirements. We also found that many instances of Dnsmasq are misconfigured to listen on the WAN interface, making the attack possible directly from the Internet.\"\n\nDnsmasq, short for [DNS masquerade](<https://en.wikipedia.org/wiki/Dnsmasq>), is a lightweight software with DNS forwarding capabilities used for locally caching DNS records, thus reducing the load on upstream nameservers and improving performance.\n\nAs of September 2020, there were about 1 million vulnerable Dnsmasq instances, JSOF found, with the software included in Android smartphones and millions of routers and other networking devices from Cisco, Aruba, Technicolor, Redhat, Siemens, Ubiquiti, and Comcast.\n\n### Revisiting Kaminsky Attack and SAD DNS\n\nThe concept of DNS cache poisoning is not new. In 2008, security researcher [Dan Kaminsky](<https://www.blackhat.com/html/webinars/kaminsky-DNS.html>) presented his findings of a widespread and critical DNS vulnerability that allowed attackers to launch cache poisoning attacks against most nameservers.\n\nIt exploited a fundamental [design flaw in DNS](<https://www.linuxjournal.com/content/understanding-kaminskys-dns-bug>) \u2014 there can be only 65,536 possible transaction IDs (TXIDs) \u2014 to flood the DNS server with forged responses, which is then cached and leveraged to route users to fraudulent websites.\n\nThe transaction IDs were introduced as a mechanism to thwart the possibility that an authoritative nameserver could be impersonated to craft malicious responses. With this new setup, DNS resolvers attached a 16-bit ID to their requests to the nameservers, which would then send back a response with the same ID.\n\n[](<https://thehackernews.com/images/-JIpwrIjlSqM/YAbJ78WhyKI/AAAAAAAABh4/snm9Ktk3GFALwllYIXNuoqTEVNJcDlL3gCLcBGAsYHQ/s0/browser.jpg>)\n\nBut the limitation in transaction IDs meant that whenever a recursive resolver queries the authoritative nameserver for a given domain (e.g., www.google.com), an attacker could flood the resolver with DNS responses for some or all of the 65 thousand or so possible transaction IDs.\n\nIf the malicious answer with the right transaction ID from the attacker arrives before the response from the authoritative server, then the DNS cache would be effectively poisoned, returning the attacker's chosen IP address instead of the legitimate address for as long as the DNS response was valid.\n\nThe attack banked on the fact that the entire lookup process is unauthenticated, meaning there is no way to verify the identity of the authoritative server, and that DNS requests and responses use UDP (User Datagram Protocol) instead of TCP, thereby making it easy to spoof the replies.\n\nTo counter the problem, a randomized UDP port was used as a second identifier along with the transaction ID, as opposed to just using port 53 for DNS lookups and responses, thus raising the entropy in the order of billions and making it practically infeasible for attackers to guess the correct combination of the source port and the transaction ID.\n\nAlthough the effectiveness of cache poisoning attacks has taken a hit due to the aforementioned source port randomization (SPR) and protocols such as [DNSSEC](<https://en.wikipedia.org/wiki/Domain_Name_System_Security_Extensions>) (Domain Name System Security Extensions), researchers last November found a \"novel\" side-channel to defeat the randomization by using ICMP rate limits as a side-channel to reveal whether a given port is open or not.\n\nThe attacks \u2014 named \"[SAD DNS](<https://thehackernews.com/2020/11/sad-dns-new-flaws-re-enable-dns-cache.html>)\" or Side-channel AttackeD DNS \u2014 involves sending a burst of spoofed UDP packets to a DNS resolver, each sent over a different port, and subsequently using [ICMP](<https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol>) \"Port Unreachable\" messages (or lack thereof) as an indicator to discern if the rate limit has been met and eventually narrow down the exact source port from which the request originated.\n\n### Mount Multi-Staged Attacks That Allow Device Takeover\n\nInterestingly, the DNS cache poisoning attacks detailed by JSOF bear similarities to SAD DNS in that the three vulnerabilities (CVE-2020-25684, CVE-2020-25685, and CVE-2020-25686) aim to reduce the entropy of the Transaction IDs and source port that are required for a response to be accepted.\n\nSpecifically, the researchers noted that despite Dnsmasq's support for SPR, it \"multiplexes multiple TXIDs on top of one port and does not link each port to specifics TXIDs,\" and that the CRC32 algorithm used for preventing DNS spoofing can be trivially defeated, leading to a scenario where \"the attacker needs to get any one of the ports right and any one of the TXIDs right.\"\n\nDnsmasq versions 2.78 to 2.82 were all found to be affected by the three flaws.\n\n[](<https://thehackernews.com/images/-mkgpTUoRhgg/YAbQoObWLDI/AAAAAAAA3ho/JOaPxZjqEAs6I6zCNOBU8hZJDPMoQI4-ACLcBGAsYHQ/s0/dns.jpg>)\n\nThe other four vulnerabilities disclosed by JSOF are heap-based buffer overflows, which can lead to potential remote code execution on the vulnerable device.\n\n\"These vulnerabilities, in and of themselves, would have limited risk, but become especially powerful since they can be combined with the cache-poisoning vulnerabilities to produce a potent attack, allowing for remote code execution,\" the researchers said.\n\nEven worse, these weaknesses can be chained with other network attacks such as [SAD DNS](<https://blog.cloudflare.com/sad-dns-explained/>) and [NAT Slipstreaming](<https://thehackernews.com/2020/11/new-natfirewall-bypass-attack-lets.html>) to mount multi-staged attacks against Dnsmasq resolvers listening on port 53. Even those that are configured to only listen to connections received from within an internal network are at risk if the malicious code gets transmitted via web browsers or other infected devices on the same network.\n\nBesides rendering them susceptible to cache poisoning, the attacks can also permit a bad actor to take control over routers and networking equipment, stage distributed denial-of-service (DDoS) attacks by subverting traffic to a malicious domain, and even prevent users from accessing legitimate sites (reverse DDoS).\n\nThe researchers also raised the possibility of a \"wormable attack\" wherein mobile devices connected to a network that uses an infected Dnsmasq server receives a bad DNS record and is then used to infect a new network upon connecting to it.\n\n### Update Dnsmasq to 2.83\n\nIt's highly recommended that vendors update their Dnsmasq software to the [latest version](<https://www.thekelleys.org.uk/dnsmasq/>) (2.83 or above) that will be released later today in order to mitigate the risk.\n\nAs workarounds, researchers suggest lowering the maximum queries allowed to be forwarded, as well as rely on DNS-over-HTTPS ([DoH](<https://thehackernews.com/2021/01/nsa-suggests-enterprises-use-designated.html>)) or DNS-over-TLS (DoT) to connect to the upstream server.\n\n\"DNS is an Internet-critical protocol whose security greatly affect[s] the security of Internet users,\" the researchers concluded. \"These issues put networking devices at risk of compromise and affect millions of Internet users, which can suffer from the cache poisoning attack presented.\n\n\"This highlight[s] the importance of DNS security in general and the security of DNS forwarders in particular. It also highlights the need to expedite the deployment of DNS security measures such as DNSSEC, DNS transport security, and DNS cookies.\"\n\n \n\n\nFound this article interesting? Follow THN on [Facebook](<https://www.facebook.com/thehackernews>), [Twitter _\uf099_](<https://twitter.com/thehackersnews>) and [LinkedIn](<https://www.linkedin.com/company/thehackernews/>) to read more exclusive content we post.\n", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-19T12:01:00", "type": "thn", "title": "A Set of Severe Flaws Affect Popular DNSMasq DNS Forwarder", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2021-04-13T11:28:13", "id": "THN:5CFE6070F72F17DAC9AFD3A651C741D8", "href": "https://thehackernews.com/2021/01/a-set-of-severe-flaws-affect-popular.html", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "redhat": [{"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-19T12:37:34", "type": "redhat", "title": "(RHSA-2021:0153) Moderate: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2021-01-19T13:10:03", "id": "RHSA-2021:0153", "href": "https://access.redhat.com/errata/RHSA-2021:0153", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-19T12:37:17", "type": "redhat", "title": "(RHSA-2021:0155) Moderate: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2021-01-19T13:10:04", "id": "RHSA-2021:0155", "href": "https://access.redhat.com/errata/RHSA-2021:0155", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-25T14:51:18", "type": "redhat", "title": "(RHSA-2021:0245) Moderate: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2021-01-25T14:59:02", "id": "RHSA-2021:0245", "href": "https://access.redhat.com/errata/RHSA-2021:0245", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-19T12:37:20", "type": "redhat", "title": "(RHSA-2021:0154) Moderate: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2021-01-19T13:10:04", "id": "RHSA-2021:0154", "href": "https://access.redhat.com/errata/RHSA-2021:0154", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-19T12:37:12", "type": "redhat", "title": "(RHSA-2021:0156) Moderate: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2021-01-19T13:02:00", "id": "RHSA-2021:0156", "href": "https://access.redhat.com/errata/RHSA-2021:0156", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "LOW", "confidentialityImpact": "NONE", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-01-25T14:03:53", "type": "redhat", "title": "(RHSA-2021:0240) Moderate: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686"], "modified": "2021-01-25T14:12:38", "id": "RHSA-2021:0240", "href": "https://access.redhat.com/errata/RHSA-2021:0240", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-03T20:41:19", "description": "The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. \n\nSecurity Fix(es):\n\n* sudo: Heap buffer overflow in argument parsing (CVE-2021-3156)\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* Previously, the Red Hat Virtualization Host (RHV-H) repository (rhvh-4-for-rhel-8-x86_64-rpms) did not include the libsmbclient package, which is a dependency for the sssd-ad package. Consequently, the sssd-ad package failed to install.\n\nWith this update, the libsmbclient is now in the RHV-H repository, and sssd-ad now installs on RHV-H. (BZ#1868967)", "cvss3": {"exploitabilityScore": 1.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 7.8, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-02-03T15:57:48", "type": "redhat", "title": "(RHSA-2021:0401) Important: Red Hat Virtualization Host security bug fix and enhancement update [ovirt-4.4.4]", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2021-3156"], "modified": "2021-02-03T16:06:16", "id": "RHSA-2021:0401", "href": "https://access.redhat.com/errata/RHSA-2021:0401", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-12-03T20:41:19", "description": "The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks.\n\nSecurity Fix(es):\n\n* sudo: Heap buffer overflow in argument parsing (CVE-2021-3156)\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\nFor more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* When performing an upgrade of the Red Hat Virtualization Host using the command `yum update`, the yum repository for RHV 4.3 EUS is unreachable\n\nAs a workaround, run the following command:\n`# yum update --releasever=7Server` (BZ#1899378)", "cvss3": {"exploitabilityScore": 1.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 7.8, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-02-03T10:15:53", "type": "redhat", "title": "(RHSA-2021:0395) Important: RHV-H security, bug fix, enhancement update (redhat-virtualization-host) 4.3.13", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2021-3156"], "modified": "2021-02-03T10:26:47", "id": "RHSA-2021:0395", "href": "https://access.redhat.com/errata/RHSA-2021:0395", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled (CVE-2020-25681)\n\n* dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled (CVE-2020-25682)\n\n* dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled (CVE-2020-25683)\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\n* dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled (CVE-2020-25687)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 8.1, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-01-19T12:37:10", "type": "redhat", "title": "(RHSA-2021:0150) Important: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "COMPLETE", "integrityImpact": "PARTIAL", "baseScore": 8.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 8.5, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25681", "CVE-2020-25682", "CVE-2020-25683", "CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2020-25687"], "modified": "2021-01-19T12:56:01", "id": "RHSA-2021:0150", "href": "https://access.redhat.com/errata/RHSA-2021:0150", "cvss": {"score": 8.3, "vector": "AV:N/AC:M/Au:N/C:P/I:P/A:C"}}, {"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled (CVE-2020-25681)\n\n* dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled (CVE-2020-25682)\n\n* dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled (CVE-2020-25683)\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\n* dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled (CVE-2020-25687)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 8.1, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-01-19T12:36:50", "type": "redhat", "title": "(RHSA-2021:0151) Important: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "COMPLETE", "integrityImpact": "PARTIAL", "baseScore": 8.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 8.5, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25681", "CVE-2020-25682", "CVE-2020-25683", "CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2020-25687"], "modified": "2021-01-19T13:05:07", "id": "RHSA-2021:0151", "href": "https://access.redhat.com/errata/RHSA-2021:0151", "cvss": {"score": 8.3, "vector": "AV:N/AC:M/Au:N/C:P/I:P/A:C"}}, {"lastseen": "2023-12-03T20:41:24", "description": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled (CVE-2020-25681)\n\n* dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled (CVE-2020-25682)\n\n* dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled (CVE-2020-25683)\n\n* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)\n\n* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)\n\n* dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled (CVE-2020-25687)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 2.2, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 8.1, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-01-19T12:36:51", "type": "redhat", "title": "(RHSA-2021:0152) Important: dnsmasq security update", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "COMPLETE", "integrityImpact": "PARTIAL", "baseScore": 8.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 8.5, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25681", "CVE-2020-25682", "CVE-2020-25683", "CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2020-25687"], "modified": "2021-01-19T12:56:03", "id": "RHSA-2021:0152", "href": "https://access.redhat.com/errata/RHSA-2021:0152", "cvss": {"score": 8.3, "vector": "AV:N/AC:M/Au:N/C:P/I:P/A:C"}}, {"lastseen": "2023-12-03T20:41:19", "description": "Red Hat OpenShift Container Platform is Red Hat's cloud computing\nKubernetes application platform solution designed for on-premise or private\ncloud deployments.\n\nSecurity Fix(es):\n\n* openshift: builder allows read and write of block devices (CVE-2021-20182)\n\n* kubernetes: Compromised node could escalate to cluster level privileges (CVE-2020-8559)\n\n* kubernetes: Docker config secrets leaked when file is malformed and loglevel >= 4 (CVE-2020-8564)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nThis advisory contains the container images for Red Hat OpenShift Container Platform 4.4.33. See the following advisory for the RPM packages for this release:\n\nhttps://access.redhat.com/errata/RHSA-2021:0282\n\nSpace precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes:\n\nhttps://docs.openshift.com/container-platform/4.4/release_notes/ocp-4-4-release-notes.html\n\nThis update fixes the following bugs among others:\n\n* Previously, there were broken connections to the API server that caused nodes to remain in the NotReady state. Detecting a broken network connection could take up to 15 minutes, during which the platform would remain unavailable. This is now fixed by setting the TCP_USER_TIMEOUT socket option, which controls how long transmitted data can be unacknowledged before the connection is forcefully closed. (BZ#1907939)\n\n* Previously, the quota controllers only worked on resources retrieved from the discovery endpoint, which might contain only a fraction of all resources due to a network error. This is now fixed by having the quota controllers periodically resync when new resources are observed from the discovery endpoint. (BZ#1910096)\n\n* Previously, the kuryr-controller was comparing security groups related to\nnetwork policies incorrectly. This caused security rules related to a\nnetwork policy to be recreated on every minor update of that network\npolicy. This bug has been fixed, allowing network policy updates that\nalready have existing rules to be preserved; network policy additions or\ndeletions are performed, if needed. (BZ#1910221)\n\nYou may download the oc tool and use it to inspect release image metadata as follows:\n\n(For x86_64 architecture)\n\n $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-x86_64\n\nThe image digest is sha256:a035dddd8a5e5c99484138951ef4aba021799b77eb9046f683a5466c23717738\n\n(For s390x architecture)\n\n $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-s390x\n\nThe image digest is sha256:ecc1e5aaf8496dd60a7703562fd6c65541172a56ae9008fce6db5d55e43371dc\n\n(For ppc64le architecture)\n\n $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-ppc64le\n\nThe image digest is sha256:567bf8031c80b08e3e56a57e1c8e5b0b01a2f922e01b36ee333f6ab5bff95495\n\nAll OpenShift Container Platform 4.4 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift Console or the CLI oc command. Instructions for upgrading a cluster are available\nat https://docs.openshift.com/container-platform/4.4/updating/updating-cluster-between-minor.html#understanding-upgrade-channels_updating-cluster-between-minor.", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-02-03T10:03:50", "type": "redhat", "title": "(RHSA-2021:0281) Important: OpenShift Container Platform 4.4.33 bug fix and security update", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "COMPLETE", "integrityImpact": "PARTIAL", "baseScore": 8.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 8.5, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-14382", "CVE-2020-2304", "CVE-2020-2305", "CVE-2020-25681", "CVE-2020-25682", "CVE-2020-25683", "CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2020-25687", "CVE-2020-25694", "CVE-2020-25696", "CVE-2020-8559", "CVE-2020-8564", "CVE-2021-20182"], "modified": "2021-02-03T10:05:11", "id": "RHSA-2021:0281", "href": "https://access.redhat.com/errata/RHSA-2021:0281", "cvss": {"score": 8.3, "vector": "AV:N/AC:M/Au:N/C:P/I:P/A:C"}}, {"lastseen": "2023-12-03T20:41:19", "description": "OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform.\n\nThis advisory contains the following OpenShift Virtualization 2.6.0 images:\n\nRHEL-8-CNV-2.6\n==============\nkubevirt-cpu-node-labeller-container-v2.6.0-5\nkubevirt-cpu-model-nfd-plugin-container-v2.6.0-5\nnode-maintenance-operator-container-v2.6.0-13\nkubevirt-vmware-container-v2.6.0-5\nvirtio-win-container-v2.6.0-5\nkubevirt-kvm-info-nfd-plugin-container-v2.6.0-5\nbridge-marker-container-v2.6.0-9\nkubevirt-template-validator-container-v2.6.0-9\nkubevirt-v2v-conversion-container-v2.6.0-6\nkubemacpool-container-v2.6.0-13\nkubevirt-ssp-operator-container-v2.6.0-40\nhyperconverged-cluster-webhook-container-v2.6.0-73\nhyperconverged-cluster-operator-container-v2.6.0-73\novs-cni-plugin-container-v2.6.0-10\ncnv-containernetworking-plugins-container-v2.6.0-10\novs-cni-marker-container-v2.6.0-10\ncluster-network-addons-operator-container-v2.6.0-16\nhostpath-provisioner-container-v2.6.0-11\nhostpath-provisioner-operator-container-v2.6.0-14\nvm-import-virtv2v-container-v2.6.0-21\nkubernetes-nmstate-handler-container-v2.6.0-19\nvm-import-controller-container-v2.6.0-21\nvm-import-operator-container-v2.6.0-21\nvirt-api-container-v2.6.0-111\nvirt-controller-container-v2.6.0-111\nvirt-handler-container-v2.6.0-111\nvirt-operator-container-v2.6.0-111\nvirt-launcher-container-v2.6.0-111\ncnv-must-gather-container-v2.6.0-54\nvirt-cdi-importer-container-v2.6.0-24\nvirt-cdi-cloner-container-v2.6.0-24\nvirt-cdi-controller-container-v2.6.0-24\nvirt-cdi-uploadserver-container-v2.6.0-24\nvirt-cdi-apiserver-container-v2.6.0-24\nvirt-cdi-uploadproxy-container-v2.6.0-24\nvirt-cdi-operator-container-v2.6.0-24\nhco-bundle-registry-container-v2.6.0-582\n\nSecurity Fix(es):\n\n* golang.org/x/crypto: Processing of crafted ssh-ed25519 public keys allows for panic (CVE-2020-9283)\n\n* golang: crypto/ssh: crafted authentication request can lead to nil pointer dereference (CVE-2020-29652)\n\n* gogo/protobuf: plugin/unmarshal/unmarshal.go lacks certain index validation (CVE-2021-3121)\n\n* golang.org/x/text: possibility to trigger an infinite loop in encoding/unicode could lead to crash (CVE-2020-14040)\n\n* golang: data race in certain net/http servers including ReverseProxy can lead to DoS (CVE-2020-15586)\n\n* golang: ReadUvarint and ReadVarint can read an unlimited number of bytes from invalid inputs (CVE-2020-16845)\n\n* jwt-go: access restriction bypass vulnerability (CVE-2020-26160)\n\n* golang-github-gorilla-websocket: integer overflow leads to denial of service (CVE-2020-27813)\n\n* golang: math/big: panic during recursive division of very large numbers (CVE-2020-28362)\n\n* containernetworking-cni: Arbitrary path injection via type field in CNI configuration (CVE-2021-20206)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-03-10T08:47:39", "type": "redhat", "title": "(RHSA-2021:0799) Moderate: OpenShift Virtualization 2.6.0 security and bug fix update", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 9.3, "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2018-10103", "CVE-2018-10105", "CVE-2018-14461", "CVE-2018-14462", "CVE-2018-14463", "CVE-2018-14464", "CVE-2018-14465", "CVE-2018-14466", "CVE-2018-14467", "CVE-2018-14468", "CVE-2018-14469", "CVE-2018-14470", "CVE-2018-14879", "CVE-2018-14880", "CVE-2018-14881", "CVE-2018-14882", "CVE-2018-16227", "CVE-2018-16228", "CVE-2018-16229", "CVE-2018-16230", "CVE-2018-16300", "CVE-2018-16451", "CVE-2018-16452", "CVE-2018-20843", "CVE-2019-11068", "CVE-2019-13050", "CVE-2019-13627", "CVE-2019-14559", "CVE-2019-14889", "CVE-2019-15165", "CVE-2019-15166", "CVE-2019-15903", "CVE-2019-16168", "CVE-2019-16935", "CVE-2019-17450", "CVE-2019-18197", "CVE-2019-19221", "CVE-2019-19906", "CVE-2019-19956", "CVE-2019-20218", "CVE-2019-20387", "CVE-2019-20388", "CVE-2019-20454", "CVE-2019-20807", "CVE-2019-20907", "CVE-2019-20916", "CVE-2019-5018", "CVE-2019-8625", "CVE-2019-8710", "CVE-2019-8720", "CVE-2019-8743", "CVE-2019-8764", "CVE-2019-8766", "CVE-2019-8769", "CVE-2019-8771", "CVE-2019-8782", "CVE-2019-8783", "CVE-2019-8808", "CVE-2019-8811", "CVE-2019-8812", "CVE-2019-8813", "CVE-2019-8814", "CVE-2019-8815", "CVE-2019-8816", "CVE-2019-8819", "CVE-2019-8820", "CVE-2019-8823", "CVE-2019-8835", "CVE-2019-8844", "CVE-2019-8846", "CVE-2020-10018", "CVE-2020-10029", "CVE-2020-11793", "CVE-2020-12321", "CVE-2020-12400", "CVE-2020-12403", "CVE-2020-13630", "CVE-2020-13631", "CVE-2020-13632", "CVE-2020-14040", "CVE-2020-14351", "CVE-2020-14382", "CVE-2020-14391", "CVE-2020-14422", "CVE-2020-15503", "CVE-2020-15586", "CVE-2020-15999", "CVE-2020-16845", "CVE-2020-1730", "CVE-2020-1751", "CVE-2020-1752", "CVE-2020-1971", "CVE-2020-24659", "CVE-2020-25681", "CVE-2020-25682", "CVE-2020-25683", "CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2020-25687", "CVE-2020-25705", "CVE-2020-26160", "CVE-2020-27813", "CVE-2020-28362", "CVE-2020-29652", "CVE-2020-29661", "CVE-2020-3862", "CVE-2020-3864", "CVE-2020-3865", "CVE-2020-3867", "CVE-2020-3868", "CVE-2020-3885", "CVE-2020-3894", "CVE-2020-3895", "CVE-2020-3897", "CVE-2020-3899", "CVE-2020-3900", "CVE-2020-3901", "CVE-2020-3902", "CVE-2020-6405", "CVE-2020-6829", "CVE-2020-7595", "CVE-2020-8492", "CVE-2020-8619", "CVE-2020-8622", "CVE-2020-8623", "CVE-2020-8624", "CVE-2020-9283", "CVE-2020-9327", "CVE-2020-9802", "CVE-2020-9803", "CVE-2020-9805", "CVE-2020-9806", "CVE-2020-9807", "CVE-2020-9843", "CVE-2020-9850", "CVE-2020-9862", "CVE-2020-9893", "CVE-2020-9894", "CVE-2020-9895", "CVE-2020-9915", "CVE-2020-9925", "CVE-2021-20206", "CVE-2021-3121", "CVE-2021-3156"], "modified": "2021-03-10T08:48:38", "id": "RHSA-2021:0799", "href": "https://access.redhat.com/errata/RHSA-2021:0799", "cvss": {"score": 9.3, "vector": "AV:N/AC:M/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-12-03T20:41:19", "description": "Red Hat OpenShift Container Platform is Red Hat's cloud computing\nKubernetes application platform solution designed for on-premise or private\ncloud deployments.\n\nThis advisory contains the container images for Red Hat OpenShift Container\nPlatform 4.7.0. See the following advisory for the RPM packages for this\nrelease:\n\nhttps://access.redhat.com/errata/RHSA-2020:5634\n\nSpace precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes:\n\nhttps://docs.openshift.com/container-platform/4.7/release_notes/ocp-4-7-release-notes.html\n\nYou may download the oc tool and use it to inspect release image metadata as follows:\n\n(For x86_64 architecture)\n\n $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.7.0-x86_64\n\nThe image digest is sha256:d74b1cfa81f8c9cc23336aee72d8ae9c9905e62c4874b071317a078c316f8a70\n\n(For s390x architecture)\n\n $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.7.0-s390x\n\nThe image digest is sha256:a68ca03d87496ddfea0ac26b82af77231583a58a7836b95de85efe5e390ad45d\n\n(For ppc64le architecture)\n\n $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.7.0-ppc64le\n\nThe image digest is sha256:bc7b04e038c8ff3a33b827f4ee19aa79b26e14c359a7dcc1ced9f3b58e5f1ac6\n\nAll OpenShift Container Platform 4.7 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift Console or the CLI oc command. Instructions for upgrading a cluster are available at https://docs.openshift.com/container-platform/4.7/updating/updating-cluster-between-minor.html#understanding-upgrade-channels_updating-cluster-between-minor.\n\nSecurity Fix(es):\n\n* crewjam/saml: authentication bypass in saml authentication (CVE-2020-27846)\n\n* golang: crypto/ssh: crafted authentication request can lead to nil pointer dereference (CVE-2020-29652)\n\n* gogo/protobuf: plugin/unmarshal/unmarshal.go lacks certain index validation (CVE-2021-3121)\n\n* nodejs-y18n: prototype pollution vulnerability (CVE-2020-7774)\n\n* kubernetes: Secret leaks in kube-controller-manager when using vSphere Provider (CVE-2020-8563)\n\n* containernetworking/plugins: IPv6 router advertisements allow for MitM attacks on IPv4 clusters (CVE-2020-10749)\n\n* heketi: gluster-block volume password details available in logs (CVE-2020-10763)\n\n* golang.org/x/text: possibility to trigger an infinite loop in encoding/unicode could lead to crash (CVE-2020-14040)\n\n* jwt-go: access restriction bypass vulnerability (CVE-2020-26160)\n\n* golang-github-gorilla-websocket: integer overflow leads to denial of service (CVE-2020-27813)\n\n* golang: math/big: panic during recursive division of very large numbers (CVE-2020-28362)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-02-24T14:49:26", "type": "redhat", "title": "(RHSA-2020:5633) Moderate: OpenShift 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"CVE-2018-16300", "CVE-2018-16451", "CVE-2018-16452", "CVE-2018-20843", "CVE-2019-11068", "CVE-2019-12614", "CVE-2019-13050", "CVE-2019-13225", "CVE-2019-13627", "CVE-2019-14889", "CVE-2019-15165", "CVE-2019-15166", "CVE-2019-15903", "CVE-2019-15917", "CVE-2019-15925", "CVE-2019-16167", "CVE-2019-16168", "CVE-2019-16231", "CVE-2019-16233", "CVE-2019-16935", "CVE-2019-17450", "CVE-2019-17546", "CVE-2019-18197", "CVE-2019-18808", "CVE-2019-18809", "CVE-2019-19046", "CVE-2019-19056", "CVE-2019-19062", "CVE-2019-19063", "CVE-2019-19068", "CVE-2019-19072", "CVE-2019-19221", "CVE-2019-19319", "CVE-2019-19332", "CVE-2019-19447", "CVE-2019-19524", "CVE-2019-19533", "CVE-2019-19537", "CVE-2019-19543", "CVE-2019-19602", "CVE-2019-19767", "CVE-2019-19770", "CVE-2019-19906", "CVE-2019-19956", "CVE-2019-20054", "CVE-2019-20218", "CVE-2019-20386", "CVE-2019-20387", "CVE-2019-20388", "CVE-2019-20454", "CVE-2019-20636", "CVE-2019-20807", "CVE-2019-20812", "CVE-2019-20907", "CVE-2019-20916", "CVE-2019-3884", "CVE-2019-5018", "CVE-2019-6977", "CVE-2019-6978", "CVE-2019-8625", "CVE-2019-8710", "CVE-2019-8720", "CVE-2019-8743", "CVE-2019-8764", "CVE-2019-8766", "CVE-2019-8769", "CVE-2019-8771", "CVE-2019-8782", "CVE-2019-8783", "CVE-2019-8808", "CVE-2019-8811", "CVE-2019-8812", "CVE-2019-8813", "CVE-2019-8814", "CVE-2019-8815", "CVE-2019-8816", "CVE-2019-8819", "CVE-2019-8820", "CVE-2019-8823", "CVE-2019-8835", "CVE-2019-8844", "CVE-2019-8846", "CVE-2019-9455", "CVE-2019-9458", "CVE-2020-0305", "CVE-2020-0444", "CVE-2020-10018", "CVE-2020-10029", "CVE-2020-10732", "CVE-2020-10749", "CVE-2020-10751", "CVE-2020-10763", "CVE-2020-10773", "CVE-2020-10774", "CVE-2020-10942", "CVE-2020-11565", "CVE-2020-11668", "CVE-2020-11793", "CVE-2020-12465", "CVE-2020-12655", "CVE-2020-12659", "CVE-2020-12770", "CVE-2020-12826", "CVE-2020-13249", "CVE-2020-13630", "CVE-2020-13631", "CVE-2020-13632", "CVE-2020-14019", "CVE-2020-14040", "CVE-2020-14381", "CVE-2020-14382", "CVE-2020-14391", "CVE-2020-14422", "CVE-2020-15157", "CVE-2020-15503", "CVE-2020-15862", "CVE-2020-15999", "CVE-2020-16166", "CVE-2020-1716", "CVE-2020-1730", "CVE-2020-1751", "CVE-2020-1752", "CVE-2020-1971", "CVE-2020-24490", "CVE-2020-24659", "CVE-2020-25211", "CVE-2020-25641", "CVE-2020-25658", "CVE-2020-25661", "CVE-2020-25662", "CVE-2020-25681", "CVE-2020-25682", "CVE-2020-25683", "CVE-2020-25684", "CVE-2020-25685", "CVE-2020-25686", "CVE-2020-25687", "CVE-2020-25694", "CVE-2020-25696", "CVE-2020-2574", "CVE-2020-26160", "CVE-2020-2752", "CVE-2020-27813", "CVE-2020-27846", "CVE-2020-28362", "CVE-2020-2922", "CVE-2020-29652", "CVE-2020-3862", "CVE-2020-3864", "CVE-2020-3865", "CVE-2020-3867", "CVE-2020-3868", "CVE-2020-3885", "CVE-2020-3894", "CVE-2020-3895", "CVE-2020-3897", "CVE-2020-3898", "CVE-2020-3899", "CVE-2020-3900", "CVE-2020-3901", "CVE-2020-3902", "CVE-2020-6405", "CVE-2020-7595", "CVE-2020-7774", "CVE-2020-8177", "CVE-2020-8492", "CVE-2020-8563", "CVE-2020-8566", "CVE-2020-8619", "CVE-2020-8622", "CVE-2020-8623", "CVE-2020-8624", "CVE-2020-8647", "CVE-2020-8648", "CVE-2020-8649", "CVE-2020-9327", "CVE-2020-9802", "CVE-2020-9803", "CVE-2020-9805", "CVE-2020-9806", "CVE-2020-9807", "CVE-2020-9843", "CVE-2020-9850", "CVE-2020-9862", "CVE-2020-9893", "CVE-2020-9894", "CVE-2020-9895", "CVE-2020-9915", "CVE-2020-9925", "CVE-2021-2007", "CVE-2021-26539", "CVE-2021-3121"], "modified": "2021-03-02T01:56:45", "id": "RHSA-2020:5633", "href": "https://access.redhat.com/errata/RHSA-2020:5633", "cvss": {"score": 10.0, "vector": "AV:N/AC:L/Au:N/C:C/I:C/A:C"}}], "nessus": [{"lastseen": "2023-05-18T15:23:09", "description": "The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:0153 advisory.\n\n - dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)\n\n - dnsmasq: loose query name check in reply_query() makes forging replies easier 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It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AHV-20201105.1045 advisory.\n\n - Net-SNMP through 5.7.3 has Improper Privilege Management because SNMP WRITE access to the EXTEND MIB provides the ability to run arbitrary commands as root. (CVE-2020-15862)\n\n - The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified.\n OpenSSL's s_server, s_client and verify tools have support for the -crl_download option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue.\n Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w). (CVE-2020-1971)\n\n - A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity. (CVE-2020-25684)\n\n - A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced.\n The highest threat from this vulnerability is to data integrity. (CVE-2020-25685)\n\n - A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name.\n This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the Birthday Attacks section of RFC5452. 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A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.\n (CVE-2020-25681)\n\n - A flaw was found in dnsmasq before 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap- allocated memory, possibly executing code on the machine. 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This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability. (CVE-2020-25683)\n\n - A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. 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This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.(CVE-2020-25683)\n\n - A flaw was found in dnsmasq. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. 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The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-25682)\n\n - A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use this flaw to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.(CVE-2020-25683)\n\n - A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries.\n However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. 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This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.(CVE-2020-25683)\n\n - A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries.\n However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. 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This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.(CVE-2020-25685)\n\n - A flaw was found in dnsmasq. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries.\n However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. 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An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-25682)\n\n - A flaw was found in dnsmasq. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. 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CVE-2020-25685
