CVE-2021-31535
Vulnerability from cvelistv5
Published
2021-05-27 12:26
Modified
2024-08-03 23:03
Severity
Summary
LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session.
References
SourceURLTags
cve@mitre.orghttp://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.htmlExploit, Third Party Advisory, VDB Entry
cve@mitre.orghttp://seclists.org/fulldisclosure/2021/May/52Mailing List, Third Party Advisory
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2021/05/18/2Mailing List, Third Party Advisory
cve@mitre.orghttps://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605Third Party Advisory
cve@mitre.orghttps://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E
cve@mitre.orghttps://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E
cve@mitre.orghttps://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E
cve@mitre.orghttps://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2021/05/msg00021.htmlThird Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/
cve@mitre.orghttps://lists.freedesktop.org/archives/xorg/Third Party Advisory
cve@mitre.orghttps://lists.x.org/archives/xorg-announce/2021-May/003088.htmlVendor Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/202105-16Third Party Advisory
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20210813-0001/Third Party Advisory
cve@mitre.orghttps://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/Exploit, Third Party Advisory
cve@mitre.orghttps://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txtExploit, Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2021/dsa-4920Third Party Advisory
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2021/05/18/2Mailing List, Third Party Advisory
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2021/05/18/3Mailing List, Third Party Advisory
Impacted products
VendorProduct
n/an/a
Show details on NVD website

To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-31535\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2021-05-27T13:15:08.240\",\"lastModified\":\"2023-11-07T03:34:58.383\",\"vulnStatus\":\"Modified\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session.\"},{\"lang\":\"es\",\"value\":\"El archivo LookupCol.c en X.Org X versiones hasta X11R7.7 y libX11 versiones anteriores a 1.7.1, podr\u00eda permitir que atacantes remotos ejecuten c\u00f3digo arbitrario.\u0026#xa0;La peticiones XLookupColor de libX11 (destinada a la b\u00fasqueda de color del lado del servidor) contiene un fallo que permite a un cliente enviar peticiones de nombre de color con un nombre m\u00e1s largo que el tama\u00f1o m\u00e1ximo permitido por el protocolo (y tambi\u00e9n m\u00e1s largo que el tama\u00f1o m\u00e1ximo de paquete para tama\u00f1o normal de paquetes).\u0026#xa0;Los datos controlados por el usuario que exceden el tama\u00f1o m\u00e1ximo son luego interpretados por el servidor como peticiones de protocolo X adicionales y ejecutados, por ejemplo, para deshabilitar completamente la autorizaci\u00f3n del servidor X.\u0026#xa0;Por ejemplo, si la v\u00edctima encuentra secuencias de control de terminal maliciosas para c\u00f3digos de color, entonces el atacante puede tomar el control total de la sesi\u00f3n gr\u00e1fica en ejecuci\u00f3n\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:P/A:P\",\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\",\"baseScore\":7.5},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":10.0,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-120\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.7.1\",\"matchCriteriaId\":\"AC5EF16E-76E0-4A32-9CF8-272B013E9F9C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:x.org:x_window_system:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"x11r7.7\",\"matchCriteriaId\":\"856DA4F8-78C3-4FC3-BC21-CD1A3C98FFA4\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E460AA51-FCDA-46B9-AE97-E6676AA5E194\"}]}]}],\"references\":[{\"url\":\"http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"http://seclists.org/fulldisclosure/2021/May/52\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/05/18/2\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2021/05/msg00021.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.freedesktop.org/archives/xorg/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.x.org/archives/xorg-announce/2021-May/003088.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/202105-16\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20210813-0001/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2021/dsa-4920\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.openwall.com/lists/oss-security/2021/05/18/2\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://www.openwall.com/lists/oss-security/2021/05/18/3\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}"
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}


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