A flaw was found in squid. An out-of-bounds read in the WCCP protocol can be leveraged as part of a chain for remote code execution leading to an information disclosure. The highest threat from this vulnerability is to data confidentiality.
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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"}}], "ubuntucve": [{"lastseen": "2023-05-28T13:31:59", "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. 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"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"}}], "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:*:*:*:*:*:*:*"]}], "alpinelinux": [{"lastseen": "2023-05-31T03:05:03", "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": {}, "published": "2023-05-31T03:03:58", "type": "alpinelinux", "title": "CVE-2021-28116", "bulletinFamily": "unix", "cvss2": {}, "cvelist": ["CVE-2021-28116"], "modified": "2023-05-31T03:03:58", "id": "ALPINE:CVE-2021-28116", "href": "", "cvss": {"score": 0.0, "vector": "NONE"}}], "debian": [{"lastseen": "2023-05-30T14:10:15", "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": "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": "2023-05-27T14:47:13", "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": "2023-05-27T15:04:18", "description": "Updates of ['squid', 'containerd'] 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"}}], "gentoo": [{"lastseen": "2023-05-29T14:38:02", "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"}}], "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": "2021-06-11T01:20:16", "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"}}, {"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"}}], "rosalinux": [{"lastseen": "2023-04-22T08:33:13", "description": "Software: squid 3.5.20\nOS: Cobalt 7.9\n \nCVE-ID: CVE-2016-10003\nCVE-Crit: HIGH\nCVE-DESC: Incorrect comparison of HTTP request headers in Squid HTTP Proxy 3.5.0.1-3.5.22 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 through a generated X.509 certificate during HTTP (S) error page generation for certificate errors. \nCVE-STATUS: by default\nCVE-REV: By 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: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2019-12526\nCVE-Crit: CRITICAL\nCVE-DESC: problem has been detected in Squid before version 4.9. URN response processing in Squid suffers from 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 leads to heap based data overflow controlled by the attacker. \nCVE-STATUS: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2019-12528\nCVE-Crit: HIGH\nCVE-DESC: An issue has been detected in Squid prior to 4.10. This allows a constructed FTP server to initiate disclosure of sensitive information from dynamic memory, such as information related to other users' sessions or non-Squid processes. \nCVE-STATUS: by default\nCVE-REV: By default\n \n \nCVE-ID: CVE-2019-12529\nCVE-Crit: MEDIUM\nCVE-DESC: The problem 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 analyzed using 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 size of the input buffer. This results in decoding and contiguous memory. An attacker will not be able to get the decoded data unless the Squid maintainer has configured to display user names on error pages. \nCVE-STATUS: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2019-12523\nCVE-Crit: CRITICAL\nCVE-DESC: problem has been detected in Squid before version 4.9. When a URN request is processed, the corresponding HTTP request is executed. This HTTP request does not pass the access checks that incoming HTTP requests pass. This bypasses all access checks and allows access to limited HTTP servers, for example, an attacker can connect to HTTP servers that only listen to localhost. \nCVE-STATUS: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2019-12524\nCVE-Crit: CRITICAL\nCVE-DESC: The problem has been detected in Squid before version 4.7. When handling 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 Cache Manager which gives details of the server for service personnel. This rule is implemented through url_regex. The url_regex URL rule handler decodes the incoming request. This allows an attacker to encode their URL to bypass the url_regex check and gain access to the blocked resource. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2019-12521\nCVE-Crit: MEDIUM\nCVE-DESC: The problem has been detected in Squid before version 4.7. When Squid parses ESI, it stores ESI items in ESIContext. The ESIContext contains a buffer to store the ESIElements stack. When a new ESIElement is parsed, 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 causes the heap 1 element to overflow. The overflow is in the same structure, so it cannot affect adjacent 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 problem has been detected in Squid through 4.7 and 5. When it receives a request, Squid checks its cache to see if it can process 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 added to the domain. This allows the attacker to specify the 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 its domain using the encoded username, and then when a request comes in for the target domain, which is decoded with the exact URL, it will serve the attacker's HTML instead of the actual HTML. On Squid servers, which also act as reverse proxies, this allows the attacker to access features that can only use reverse proxies, such as ESI. \nCVE-STATUS: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2019-12522\nCVE-Crit: MEDIUM\nCVE-DESC: The problem has been detected in Squid before version 4.7. When Squid is started as root, it spawns its child processes as a lesser user, by default it is a nobody user. This is done with a leave_suid call. The leave_suid leaves the saved UID as 0. This makes it trivial for an attacker who has compromised a child process to escalate its privileges to root. \nCVE-STATUS: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2019-18677\nCVE-Crit: MEDIUM\nCVE-DESC: a problem has been detected in Squid 3.x and 4.x - 4.8 when using the append_domain parameter (because the added characters do not interact properly with hostname length restrictions). Due to improper message handling, it may not properly 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: The problem has been detected in Squid 3.x and 4.x to 4.8. It allows attackers to pass HTTP requests through the interface software to a Squid instance which shares the HTTP request pipeline differently. The resulting Response messages corrupt caches (between the client and Squid) of attacker-controlled content at arbitrary URLs. The impact on the software is isolated between the attacker and Squid. It does not affect Squid itself or any upstream servers. The problem is related to the request header containing spaces between the header name and the colon. \nCVE-STATUS: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2019-18679\nCVE-Crit: HIGH\nCVE-DESC: The problem has been detected in Squid 2.x, 3.x and 4.x - 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 protection and can help attackers isolate memory areas 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 using certain web browsers, does not handle HTML correctly in the host parameter (also known as hostname) in cachemgr.cgi. \nCVE-STATUS: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2019-18676\nCVE-Crit: HIGH\nCVE-DESC: The problem has been detected in Squid 3.x and 4.x - 4.8. Due to improper input validation, a heap-based buffer overflow occurs, which can result in 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 URI scheme created. \nCVE-STATUS: default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2020-15811\nCVE-Crit: MEDIUM\nCVE-DESC: The problem was detected in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, attacks with split HTTP requests can succeed for HTTP and HTTPS traffic. This leads to 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 Transfer-Encoding header analysis to look for fragmented encoding. This allows the attacker to hide the second request within Transfer-Encoding: it is interpreted by Squid as fragmented and split into a second request delivered upstream. Squid will then send two different responses to the client, corrupting all the downstream caches. \nCVE-STATUS: by default\nCVE-REV: The default\n \n \nCVE-ID: CVE-2020-15810\nCVE-Crit: MEDIUM\nCVE-DESC: The problem has been detected in Squid before 4.13 and 5.x before 5.0.4. Due to improper data validation, HTTP request smuggling attacks can succeed against HTTP and HTTPS traffic. This leads to 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 parsing of headers (the default), Squid retransmits headers containing space characters to upstream servers. When this occurs as a prefix to the 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: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2020-14058\nCVE-Crit: HIGH\nCVE-DESC: The problem has been detected 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 assistant are vulnerable to denial of service when opening a TLS connection to a maliciously controlled server for HTTPS. This happens because unrecognized error values are displayed as NULL, but later code expects each error value to be mapped to a valid error string. \nCVE-STATUS: default\nCVE-REV: default\n \n \nCVE-ID: CVE-2020-15049\nCVE-Crit: HIGH\nCVE-DESC: problem 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 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: by 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 created Cache Digest response message. This only happens when cache_peer is used with the cache digest 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: A problem has been detected in Squid prior to versions 4.13 and 5.x to 5.0.4. Due to incorrect input validation, it allows a trusted client to smuggle HTTP requests and access services that are otherwise not allowed by security controls. This happens for certain uri_whitespace configuration settings. \nCVE-STATUS: default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2020-8517\nCVE-Crit: HIGH\nCVE-DESC: A problem was detected in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl can write to memory outside the credentials buffer. On systems with memory access protection, this can cause the auxiliary process to terminate unexpectedly. This causes the Squid process to terminate and deny service to all clients using the proxy. \nCVE-STATUS: by default\nCVE-REV: By default\n \n \nCVE-ID: CVE-2020-8450\nCVE-Crit: HIGH\nCVE-DESC: A problem has been detected 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: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2020-8449\nCVE-Crit: HIGH\nCVE-DESC: a problem was detected in Squid before 4.10. Due to incorrect input validation, it can interpret created HTTP requests in unexpected ways to access server resources forbidden by earlier security filters. \nCVE-STATUS: by default\nCVE-REV: by default\n \n \nCVE-ID: CVE-2021-28116\nCVE-Crit: MEDIUM\nCVE-DESC: Squid up to versions 4.14 and 5.x to 5.0.5 allow disclosure in some configurations due to WCCP protocol data being read outside. This can be used as part of the chain for remote code execution as none. \nCVE-STATUS: by default\nCVE-REV: by 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
