Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.
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The highest threat from this vulnerability is to data confidentiality.\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-03-17T10:34:28", "type": "redhatcve", "title": "CVE-2021-28116", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2023-04-06T07:38:20", "id": "RH:CVE-2021-28116", "href": "https://access.redhat.com/security/cve/cve-2021-28116", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "suse": [{"lastseen": "2022-11-06T12:08:56", "description": "An update that fixes one vulnerability is now available.\n\nDescription:\n\n This update for squid fixes the following issues:\n\n Update to version 4.17:\n\n - CVE-2021-28116: Fixed a out-of-bounds read in the WCCP protocol\n (bsc#1189403).\n\n\nPatch Instructions:\n\n To install this openSUSE Security Update use the SUSE recommended installation methods\n like YaST online_update or \"zypper patch\".\n\n Alternatively you can run the command listed for your product:\n\n - openSUSE Leap 15.3:\n\n zypper in -t patch openSUSE-SLE-15.3-2021-3485=1", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-10-20T00:00:00", "type": "suse", "title": "Security update for squid (moderate)", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2021-10-20T00:00:00", "id": "OPENSUSE-SU-2021:3485-1", "href": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/ZZT7QFDJXMSX6NXIB2FSSHOCTFVNNNMF/", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}, {"lastseen": "2022-11-06T12:08:56", "description": "An update that fixes one vulnerability is now available.\n\nDescription:\n\n This update for squid fixes the following issues:\n\n Update to version 4.17:\n\n - CVE-2021-28116: Fixed a out-of-bounds read in the WCCP protocol\n (bsc#1189403).\n\n This update was imported from the SUSE:SLE-15:Update update project.\n\n\nPatch Instructions:\n\n To install this openSUSE Security Update use the SUSE recommended installation methods\n like YaST online_update or \"zypper patch\".\n\n Alternatively you can run the command listed for your product:\n\n - openSUSE Leap 15.2:\n\n zypper in -t patch openSUSE-2021-1419=1", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-10-31T00:00:00", "type": "suse", "title": "Security update for squid (moderate)", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2021-10-31T00:00:00", "id": "OPENSUSE-SU-2021:1419-1", "href": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/NZHVBTOAFMYNYOVMQUSRJMITM2FJLGC7/", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "cve": [{"lastseen": "2023-05-27T14:34:55", "description": "Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-03-09T22:15:00", "type": "cve", "title": "CVE-2021-28116", "cwe": ["CWE-125"], "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2023-02-03T18:56:00", "cpe": ["cpe:/a:squid-cache:squid:4.14", "cpe:/o:debian:debian_linux:11.0", "cpe:/o:debian:debian_linux:10.0", "cpe:/o:fedoraproject:fedora:33", "cpe:/a:squid-cache:squid:5.0.5", "cpe:/o:fedoraproject:fedora:34"], "id": "CVE-2021-28116", "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-28116", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}, "cpe23": ["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "cpe:2.3:a:squid-cache:squid:4.14:*:*:*:*:*:*:*", "cpe:2.3:a:squid-cache:squid:5.0.5:*:*:*:*:*:*:*"]}], "mageia": [{"lastseen": "2023-05-27T15:00:33", "description": "Updated squid packages fix security vulnerability: Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody (CVE-2021-28116). Squid is updated to 4.17 that fixes this issue and other bugs. \n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-10-31T11:12:48", "type": "mageia", "title": "Updated squid packages fix security vulnerability\n", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2021-10-31T11:12:48", "id": "MGASA-2021-0499", "href": "https://advisories.mageia.org/MGASA-2021-0499.html", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "prion": [{"lastseen": "2023-08-16T02:54:46", "description": "Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-03-09T22:15:00", "type": "prion", "title": "CVE-2021-28116", "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2023-02-03T18:56:00", "id": "PRION:CVE-2021-28116", "href": "https://kb.prio-n.com/vulnerability/CVE-2021-28116", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "rocky": [{"lastseen": "2023-07-24T17:24:28", "description": "An update is available for squid, libecap.\nThis update affects Rocky Linux 8.\nA Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list\nSquid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.\n\nSecurity Fix(es):\n\n* squid: out-of-bounds read in WCCP protocol data may lead to information disclosure (CVE-2021-28116)\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\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Rocky Linux 8.6 Release Notes linked from the References section.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2022-05-10T06:39:58", "type": "rocky", "title": "squid:4 security and bug fix update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2022-05-10T06:39:58", "id": "RLSA-2022:1939", "href": "https://errata.rockylinux.org/RLSA-2022:1939", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "almalinux": [{"lastseen": "2023-09-22T21:09:18", "description": "Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.\nSecurity Fix(es):\n* squid: out-of-bounds read in WCCP protocol data may lead to information disclosure (CVE-2021-28116)\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.\nAdditional Changes:\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2022-05-10T00:00:00", "type": "almalinux", "title": "Moderate: squid:4 security and bug fix update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2022-07-07T14:00:36", "id": "ALSA-2022:1939", "href": "https://errata.almalinux.org/8/ALSA-2022-1939.html", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "debiancve": [{"lastseen": "2023-05-27T15:16:32", "description": "Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-03-09T22:15:00", "type": "debiancve", "title": "CVE-2021-28116", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2021-03-09T22:15:00", "id": "DEBIANCVE:CVE-2021-28116", "href": "https://security-tracker.debian.org/tracker/CVE-2021-28116", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "ubuntu": [{"lastseen": "2023-05-27T14:58:49", "description": "## Releases\n\n * Ubuntu 21.04 \n * Ubuntu 20.04 LTS\n * Ubuntu 18.04 ESM\n\n## Packages\n\n * squid \\- Web proxy cache server\n * squid3 \\- Web proxy cache server\n\nLyu discovered that Squid incorrectly handled WCCP protocol data. A remote \nattacker could use this issue to cause Squid to crash, resulting in a \ndenial of service, or possibly obtain sensitive information.\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-10-05T00:00:00", "type": "ubuntu", "title": "Squid vulnerability", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2021-10-05T00:00:00", "id": "USN-5104-1", "href": "https://ubuntu.com/security/notices/USN-5104-1", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "ubuntucve": [{"lastseen": "2023-06-29T13:59:01", "description": "Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows\ninformation disclosure because of an out-of-bounds read in WCCP protocol\ndata. This can be leveraged as part of a chain for remote code execution as\nnobody.\n\n#### Bugs\n\n * <https://bugs.squid-cache.org/show_bug.cgi?id=5131>\n * <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986804>\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2021-03-09T00:00:00", "type": "ubuntucve", "title": "CVE-2021-28116", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2021-03-09T00:00:00", "id": "UB:CVE-2021-28116", "href": "https://ubuntu.com/security/CVE-2021-28116", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "redhat": [{"lastseen": "2023-05-27T14:34:05", "description": "Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.\n\nSecurity Fix(es):\n\n* squid: out-of-bounds read in WCCP protocol data may lead to information disclosure (CVE-2021-28116)\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\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 8.6 Release Notes linked from the References section.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2022-05-10T06:39:58", "type": "redhat", "title": "(RHSA-2022:1939) Moderate: squid:4 security and bug fix update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116"], "modified": "2022-05-10T10:03:43", "id": "RHSA-2022:1939", "href": "https://access.redhat.com/errata/RHSA-2022:1939", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "debian": [{"lastseen": "2023-08-18T15:17:37", "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-5171-1 security@debian.org\nhttps://www.debian.org/security/ Moritz Muehlenhoff\nJune 27, 2022 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : squid\nCVE ID : CVE-2021-28116 CVE-2021-46784\n\nMultiple security issues were discovered in the Squid proxy caching\nserver:\n\nCVE-2021-28116\n\n Amos Jeffries discovered an information leak if WCCPv2 is enabled\n\nCVE-2021-46784\n\n Joshua Rogers discovered that an error in parsing Gopher server\n responses may result in denial of service\n\n\nFor the oldstable distribution (buster), these problems have been fixed\nin version 4.6-1+deb10u7.\n\nFor the stable distribution (bullseye), these problems have been fixed in\nversion 4.13-10+deb11u1.\n\nWe recommend that you upgrade your squid packages.\n\nFor the detailed security status of squid please refer to\nits security tracker page at:\nhttps://security-tracker.debian.org/tracker/squid\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2022-06-27T18:45:27", "type": "debian", "title": "[SECURITY] [DSA 5171-1] squid security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116", "CVE-2021-46784"], "modified": "2022-06-27T18:45:27", "id": "DEBIAN:DSA-5171-1:89438", "href": "https://lists.debian.org/debian-security-announce/2022/msg00139.html", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N"}}], "photon": [{"lastseen": "2023-05-27T14:47:13", "description": "Updates of ['squid'] packages of Photon OS have been released.\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2021-07-20T00:00:00", "type": "photon", "title": "Important Photon OS Security Update - PHSA-2021-4.0-0063", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116", "CVE-2021-28651", "CVE-2021-28652", "CVE-2021-28662", "CVE-2021-31806", "CVE-2021-31807", "CVE-2021-31808", "CVE-2021-33620"], "modified": "2021-07-20T00:00:00", "id": "PHSA-2021-4.0-0063", "href": "https://github.com/vmware/photon/wiki/Security-Update-4.0-63", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2022-05-12T18:55:44", "description": "Updates of ['squid'] packages of Photon OS have been released.\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2021-07-19T00:00:00", "type": "photon", "title": "Important Photon OS Security Update - PHSA-2021-0063", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116", "CVE-2021-28651", "CVE-2021-28652", "CVE-2021-28662", "CVE-2021-31806", "CVE-2021-31807", "CVE-2021-31808", "CVE-2021-33620"], "modified": "2021-07-19T00:00:00", "id": "PHSA-2021-0063", "href": "https://github.com/vmware/photon/wiki/Security-Update-4.0-63", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2023-09-24T14:27:52", "description": "Updates of ['containerd', 'squid'] packages of Photon OS have been released.\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2021-07-20T00:00:00", "type": "photon", "title": "Important Photon OS Security Update - PHSA-2021-3.0-0269", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "baseScore": 6.8, "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 6.4, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116", "CVE-2021-28651", "CVE-2021-28652", "CVE-2021-28662", "CVE-2021-31806", "CVE-2021-31807", "CVE-2021-31808", "CVE-2021-32760", "CVE-2021-33620"], "modified": "2021-07-20T00:00:00", "id": "PHSA-2021-3.0-0269", "href": "https://github.com/vmware/photon/wiki/Security-Update-3.0-269", "cvss": {"score": 6.8, "vector": "AV:N/AC:M/Au:N/C:P/I:P/A:P"}}], "fedora": [{"lastseen": "2023-05-27T14:49:25", "description": "Squid is a high-performance proxy caching server for Web clients, supporting FTP, gopher, and HTTP data objects. Unlike traditional caching software, Squid handles all requests in a single, non-blocking, I/O-driven process. Squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups, supports non-blocking DNS lookups, and implements negative caching of failed requests. Squid consists of a main server program squid, a Domain Name System lookup program (dnsserver), a program for retrieving FTP data (ftpget), and some management and client tools. ", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2021-06-11T01:16:02", "type": "fedora", "title": "[SECURITY] Fedora 34 Update: squid-5.0.6-1.fc34", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116", "CVE-2021-28651", "CVE-2021-28652", "CVE-2021-28662", "CVE-2021-31806", "CVE-2021-31807", "CVE-2021-31808", "CVE-2021-33620"], "modified": "2021-06-11T01:16:02", "id": "FEDORA:CC54030AE7DD", "href": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2023-05-27T14:49:25", "description": "Squid is a high-performance proxy caching server for Web clients, supporting FTP, gopher, and HTTP data objects. Unlike traditional caching software, Squid handles all requests in a single, non-blocking, I/O-driven process. Squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups, supports non-blocking DNS lookups, and implements negative caching of failed requests. Squid consists of a main server program squid, a Domain Name System lookup program (dnsserver), a program for retrieving FTP data (ftpget), and some management and client tools. ", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2021-06-11T01:20:16", "type": "fedora", "title": "[SECURITY] Fedora 33 Update: squid-4.15-1.fc33", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2021-28116", "CVE-2021-28651", "CVE-2021-28652", "CVE-2021-28662", "CVE-2021-31806", "CVE-2021-31807", "CVE-2021-31808", "CVE-2021-33620"], "modified": "2021-06-11T01:20:16", "id": "FEDORA:C4C0D3091C28", "href": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "gentoo": [{"lastseen": "2023-06-06T15:24:40", "description": "### Background\n\nSquid is a full-featured Web proxy cache designed to run on Unix systems. It supports proxying and caching of HTTP, FTP, and other URLs, as well as SSL support, cache hierarchies, transparent caching, access control lists and many other features. \n\n### Description\n\nMultiple vulnerabilities have been discovered in Squid. Please review the CVE identifiers referenced below for details. \n\n### Impact\n\nA remote attacker could send a specially crafted request, possibly resulting in a Denial of Service condition or information leak. \n\n### Workaround\n\nThere is no known workaround at this time.\n\n### Resolution\n\nAll Squid users should upgrade to the latest version:\n \n \n # emerge --sync\n # emerge --ask --oneshot --verbose \">=net-proxy/squid-4.15\"", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 8.6, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 4.0}, "published": "2021-05-26T00:00:00", "type": "gentoo", "title": "Squid: Multiple vulnerabilities", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-25097", "CVE-2021-28116", "CVE-2021-28651", "CVE-2021-28652", "CVE-2021-28662", "CVE-2021-31806", "CVE-2021-31807", "CVE-2021-31808"], "modified": "2021-05-26T00:00:00", "id": "GLSA-202105-14", "href": "https://security.gentoo.org/glsa/202105-14", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:P/I:N/A:N"}}], "rosalinux": [{"lastseen": "2023-09-08T23:13:37", "description": "Software: squid 3.5.20\nOS: Cobalt 7.9\n \nCVE-ID: CVE-2016-10003\nCVE-Crit: HIGH\nCVE-DESC: An incorrect comparison of HTTP request headers in Squid HTTP Proxy 3.5.0.0.1-3.5.22 and 4.0.1-4.0.16 causes Collapsed Forwarding to incorrectly identify some private responses as suitable for delivery to multiple clients. \nCVE-STATUS: Default\nCVE-REV: default\n \n \nCVE-ID: CVE-2018-19131\nCVE-Crit: MEDIUM\nCVE-DESC: Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP error page (S) generation for certificate errors. \nCVE-STATUS: Default\nCVE-REV: Default\n \n \nCVE-ID: CVE-2018-19132\nCVE-Crit: MEDIUM\nCVE-DESC: Squid before 4.4, when SNMP is enabled, allows denial of service (memory leak) via SNMP packet. \nCVE-STATUS: Default\nCVE-REV: Default\n \n \nCVE-ID: CVE-2019-12526\nCVE-Crit: CRITICAL\nCVE-DESC: An issue was discovered in Squid prior to version 4.9. The processing of URN responses in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to a URN request, Squid cannot ensure that the response fits in the buffer. This results in a heap-based data overflow controlled by an attacker. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-12528\nCVE-Crit: HIGH\nCVE-DESC: An issue was discovered in Squid prior to 4.10. This allows an engineered FTP server to initiate the disclosure of sensitive information from dynamic memory, such as information related to other users' sessions or non-Squid processes. \nCVE-STATUS: Default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-12529\nCVE-Crit: MEDIUM\nCVE-DESC: The issue was found in Squid 2.x - 2.7.STABLE9, 3.x - 3.5.28, and 4.x - 4.7. When Squid is configured to use basic authentication, the Proxy-Authorization header is parsed by uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to make sure that the calculated length does not exceed the input buffer size. This results in decoding and contiguous memory. An attacker cannot get the decoded data unless the Squid maintainer has configured the display of usernames on error pages. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-12523\nCVE-Crit: CRITICAL\nCVE-DESC: An issue was discovered in Squid before version 4.9. When processing a URN request, the corresponding HTTP request is executed. This HTTP request does not pass the access checks that incoming HTTP requests pass. This has the effect of bypassing all access checks and allowing access to restricted HTTP servers, e.g. an attacker can connect to HTTP servers that only listen to localhost. \nCVE-STATUS: Default\nCVE-REV: Default\n \n \nCVE-ID: CVE-2019-12524\nCVE-Crit: CRITICAL\nCVE-DESC: An issue was discovered in Squid prior to version 4.7. When processing requests from users, Squid checks its rules to see if the request should be denied. Squid by default comes with rules to block access to the Cache Manager, which provides detailed server information intended for maintenance personnel. This rule is implemented via url_regex. The url_regex rule URL handler decodes the incoming request. This allows an attacker to encode their URL to bypass the url_regex check and access the blocked resource. \nCVE-STATUS: Default\nCVE-REV: Default\n \n \nCVE-ID: CVE-2019-12521\nCVE-Crit: MEDIUM\nCVE-DESC: An issue was discovered in Squid before version 4.7. When Squid analyzes ESI, it stores ESI items in ESIContext. ESIContext contains a buffer to store a stack of ESIElements. When a new ESIElement is analyzed, it is added via addStackElement. The addStackElement has a check for the number of elements in this buffer, but it is disabled at 1, which results in a heap overflow of 1 element. The overflow is in the same structure, so it cannot affect neighboring memory blocks and thus just causes a failure during processing. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-12520\nCVE-Crit: HIGH\nCVE-DESC: The issue was discovered in Squid through 4.7 and 5. When Squid receives a request, it checks its cache to see if it can handle the response. It does this by creating an MD5 hash of the absolute URL of the request. If it is found, it serves the request. The absolute URL may include decoded UserInfo (username and password) for certain protocols. This decoded information is appended to the domain. This allows an attacker to specify a username with special characters to separate the domain and treat the rest of the URL as a path or query string. An attacker can first make a request to their domain using the encoded username, and then when a request comes in for the target domain that is decoded with the exact URL, it will serve the attacker HTML instead of the actual HTML. On Squid servers that also act as reverse proxies, this allows the attacker to access features that only reverse proxies can use, such as ESI. \nCVE-STATUS: Default\nCVE-REV: Default\n \n \nCVE-ID: CVE-2019-12522\nCVE-Crit: MEDIUM\nCVE-DESC: An issue was discovered in Squid before version 4.7. When Squid is started as root, it spawns its child processes as a smaller user, the default user is nobody. This is done by calling leave_suid. leave_suid leaves the saved UID set to 0. This makes it trivial for an attacker who has compromised a child process to elevate its privileges to root. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-18677\nCVE-Crit: MEDIUM\nCVE-DESC: An issue was found in Squid 3.x and 4.x through 4.8 when using the append_domain parameter (because the appended characters do not interact properly with hostname length restrictions). Due to improper handling of the message, it can incorrectly redirect traffic to sources it should not be delivered to. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-18678\nCVE-Crit: MEDIUM\nCVE-DESC: An issue has been discovered in Squid 3.x and 4.x through 4.8. This allows attackers to pass HTTP requests through the interface software to a Squid instance that shares the HTTP request pipeline differently. The resulting Response messages corrupt caches (between the client and Squid) with content controlled by the attacker to arbitrary URLs. The software consequences are isolated between the attacker and Squid. It does not affect Squid itself or any upstream servers. The problem is due to the request header containing spaces between the header name and the colon. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-18679\nCVE-Crit: HIGH\nCVE-DESC: The issue was discovered in Squid 2.x, 3.x and 4.x through 4.8. Due to improper data management, it is vulnerable to information disclosure when processing HTTP digest authentication. Nonce markers contain the raw byte value of a pointer located in allocated heap memory. This information reduces ASLR defenses and can help attackers isolate memory regions for remote code execution attacks. \nCVE-STATUS: Default\nCVE-REV: Default\n \n \nCVE-ID: CVE-2019-18860\nCVE-Crit: MEDIUM\nCVE-DESC: Squid before 4.9, when certain web browsers are used, does not properly handle HTML in the host parameter (also known as hostname) in cachemgr.cgi. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-18676\nCVE-Crit: HIGH\nCVE-DESC: An issue has been found in Squid 3.x and 4.x through 4.8. Improper input validation causes a heap-based buffer overflow, which can cause a denial of service for all clients using the proxy. The severity is high because this vulnerability occurs before normal security checks; any remote client that can contact the proxy port can easily perform an attack through the generated URI scheme. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-15811\nCVE-Crit: MEDIUM\nCVE-DESC: The issue was found in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP request separation attacks can be successful for HTTP and HTTPS traffic. This results in cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any subsequent caches with content from an arbitrary source. Squid uses string search instead of analyzing the Transfer-Encoding header to find fragmented encoding. This allows an attacker to hide a second request within Transfer-Encoding: it is interpreted by Squid as fragmented and split into a second request delivered in the upstream direction. Squid will then send two different responses to the client, corrupting all downstream caches. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-15810\nCVE-Crit: MEDIUM\nCVE-DESC: The issue was found in Squid before 4.13 and 5.x before 5.0.4. Due to improper data validation, HTTP request smuggling attacks can be successful against HTTP and HTTPS traffic. This results in cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the proxy cache and any subsequent caches with content from an arbitrary source. When configured for simplified header parsing (the default), Squid retransmits headers containing whitespace characters to upstream servers. When this occurs as a prefix to a Content-Length header, the specified frame length will be ignored by Squid (allowing the conflicting length from another Content-Length header to be used) but retransmitted upstream. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-14058\nCVE-Crit: HIGH\nCVE-DESC: The issue was discovered in Squid before 4.12 and 5.x before 5.0.3. Due to the use of a potentially dangerous feature, Squid and the default certificate validation helper are vulnerable to denial of service when opening a TLS connection to an attacker-controlled server for HTTPS. This is because unrecognized error values are mapped to NULL, but later code expects each error value to map to a valid error string. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-15049\nCVE-Crit: HIGH\nCVE-DESC: An issue was found in http / ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. Request Smuggling and Poisoning attack can be successful against an HTTP cache. The client sends an HTTP request with a Content-Length header containing \"+ \\\"-\"or an unusual shell space character prefix to the length field value. \nCVE-STATUS: Default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-24606\nCVE-Crit: HIGH\nCVE-DESC: Squid before 4.13 and 5.x before 5.0.4 allows a trusted partner to perform a denial of service using all available CPU cycles while processing a generated Cache Digest response message. This only occurs when cache_peer is used with the cache digests function. The problem exists because the livelocking peerDigestHandleReply () in peer_digest.cc does not handle EOF correctly. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-25097\nCVE-Crit: HIGH\nCVE-DESC: An issue was found in Squid prior to versions 4.13 and 5.x through 5.0.4. Due to improper input validation, it allows a trusted client to smuggle HTTP requests and access services that are otherwise denied by security controls. This occurs for certain uri_whitespace configuration settings. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-8517\nCVE-Crit: HIGH\nCVE-DESC: An issue was discovered in Squid before 4.10. Due to improper input validation, the NTLM authentication credential parser in ext_lm_group_acl can write to memory outside of the credential buffer. On systems with memory access protection, this can cause an auxiliary process to terminate unexpectedly. This results in Squid process termination and denial of service for all clients using the proxy. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-8450\nCVE-Crit: HIGH\nCVE-DESC: An issue was discovered in Squid before 4.10. Due to improper buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-8449\nCVE-Crit: HIGH\nCVE-DESC: An issue was discovered in Squid before 4.10. Due to improper input validation, it can interpret generated HTTP requests in unexpected ways to access server resources denied by earlier security filters. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2021-28116\nCVE-Crit: MEDIUM\nCVE-DESC: Squid prior to versions 4.14 and 5.x through 5.0.5 in some configurations allows information disclosure due to WCCP protocol data being read out of bounds. This can be used as part of a chain to remotely execute code like nobody. \nCVE-STATUS: default\nCVE-REV: default\n \n\n", "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": "2021-07-02T18:10:45", "type": "rosalinux", "title": "Advisory ROSA-SA-2021-1976", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "PARTIAL", "availabilityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "baseScore": 7.5, "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 6.4, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2016-10003", "CVE-2018-19131", "CVE-2018-19132", "CVE-2019-12520", "CVE-2019-12521", "CVE-2019-12522", "CVE-2019-12523", "CVE-2019-12524", "CVE-2019-12526", "CVE-2019-12528", "CVE-2019-12529", "CVE-2019-18676", "CVE-2019-18677", "CVE-2019-18678", "CVE-2019-18679", "CVE-2019-18860", "CVE-2020-14058", "CVE-2020-15049", "CVE-2020-15810", "CVE-2020-15811", "CVE-2020-24606", "CVE-2020-25097", "CVE-2020-8449", "CVE-2020-8450", "CVE-2020-8517", "CVE-2021-28116"], "modified": "2021-07-02T18:10:45", "id": "ROSA-SA-2021-1976", "href": "https://abf.rosalinux.ru/advisories/ROSA-SA-2021-1976", "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}}]}
CVE-2021-28116
