CVE-2023-50269

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Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives."}, {"lang": "es", "value": "Squid es un proxy de almacenamiento en cach\u00e9 para la Web. Debido a un error de recursi\u00f3n no controlada en las versiones 2.6 a 2.7.STABLE9, versiones 3.1 a 5.9 y versiones 6.0.1 a 6.5, Squid puede ser vulnerable a un ataque de denegaci\u00f3n de servicio contra el an\u00e1lisis de solicitudes HTTP. Este problema permite que un cliente remoto realice un ataque de denegaci\u00f3n de servicio enviando un encabezado X-Forwarded-For grande cuando la funci\u00f3n follow_x_forwarded_for est\u00e1 configurada. Este error se solucion\u00f3 con la versi\u00f3n 6.6 de Squid. Adem\u00e1s, los parches que solucionan este problema para las versiones estables se pueden encontrar en los archivos de parches de Squid."}], "id": "CVE-2023-50269", "lastModified": "2026-06-17T06:39:25.343", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-50269", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2023-12-19T14:21:27.775746Z", "version": "2.0.3"}}]}, "published": "2023-12-14T18:15:45.070", "references": [{"source": "security-advisories@github.com", "tags": ["Broken Link"], "url": "http://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch"}, {"source": "security-advisories@github.com", "tags": ["Broken Link"], "url": "http://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/squid-cache/squid/security/advisories/GHSA-wgq4-4cfg-c4x3"}, {"source": "security-advisories@github.com", "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00003.html"}, {"source": "security-advisories@github.com", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/"}, {"source": "security-advisories@github.com", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/"}, {"source": "security-advisories@github.com", "url": "https://security.netapp.com/advisory/ntap-20240119-0005/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Broken Link"], "url": "http://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Broken Link"], "url": "http://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/squid-cache/squid/security/advisories/GHSA-wgq4-4cfg-c4x3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00003.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://security.netapp.com/advisory/ntap-20240119-0005/"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2024:1787", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "squid-7:3.5.20-17.el7_9.10", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2024-04-11T00:00:00Z"}, {"advisory": "RHSA-2024:1375", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "squid:4-8090020240314114525.a75119d5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-03-19T00:00:00Z"}, {"advisory": "RHSA-2024:0772", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "squid:4-8020020240122164331.4cda2c84", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2024-02-12T00:00:00Z"}, {"advisory": "RHSA-2024:0772", "cpe": "cpe:/a:redhat:rhel_tus:8.2", "package": "squid:4-8020020240122164331.4cda2c84", "product_name": "Red Hat Enterprise Linux 8.2 Telecommunications Update Service", "release_date": "2024-02-12T00:00:00Z"}, {"advisory": "RHSA-2024:0772", "cpe": "cpe:/a:redhat:rhel_e4s:8.2", "package": "squid:4-8020020240122164331.4cda2c84", "product_name": "Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions", "release_date": "2024-02-12T00:00:00Z"}, {"advisory": "RHSA-2024:0773", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "squid:4-8040020240122165847.522a0ee4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2024-02-12T00:00:00Z"}, {"advisory": "RHSA-2024:0773", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "squid:4-8040020240122165847.522a0ee4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2024-02-12T00:00:00Z"}, {"advisory": "RHSA-2024:0773", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "squid:4-8040020240122165847.522a0ee4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2024-02-12T00:00:00Z"}, {"advisory": "RHSA-2024:0771", "cpe": "cpe:/a:redhat:rhel_eus:8.6", "package": "squid:4-8060020231222131040.ad008a3a", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2024-02-12T00:00:00Z"}, {"advisory": "RHSA-2024:0397", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "squid:4-8080020231222130009.63b34585", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-01-24T00:00:00Z"}, {"advisory": "RHSA-2024:1376", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "squid-7:5.5-6.el9_3.8", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-03-19T00:00:00Z"}, {"advisory": "RHSA-2024:1153", "cpe": "cpe:/a:redhat:rhel_eus:9.0", "package": "squid-7:5.2-1.el9_0.4", "product_name": "Red Hat Enterprise Linux 9.0 Extended Update Support", "release_date": "2024-03-05T00:00:00Z"}, {"advisory": "RHSA-2024:1085", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "squid-7:5.5-5.el9_2.4", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-03-05T00:00:00Z"}], "bugzilla": {"description": "squid: denial of service in HTTP request parsing", "id": "2254663", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2254663"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-674", "details": ["Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives.", "A flaw was found in Squid, which is susceptible to a Denial of Service (DoS) due to an Uncontrolled Recursion bug, specifically targeting HTTP Request parsing. Exploiting this issue involves a remote client initiating a DoS attack by sending an oversized X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This issue poses a threat to the stability and availability of the Squid service."], "mitigation": {"lang": "en:us", "value": "Remove all \"follow_x_forwarded_for\" lines from squid.conf."}, "name": "CVE-2023-50269", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "squid", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "squid34", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2023-12-14T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-50269\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-50269\nhttp://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch\nhttp://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch\nhttps://github.com/squid-cache/squid/security/advisories/GHSA-wgq4-4cfg-c4x3"], "statement": "Squid configurations lacking the \"follow_x_forwarded_for\" setting are not susceptible to the vulnerability.", "threat_severity": "Important"}

{}