CVE-2021-31535

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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."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-09-02T03:07:21.000Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt"}, {"tags": ["x_refsource_MISC"], "url": "https://lists.freedesktop.org/archives/xorg/"}, {"name": "[oss-security] 20210518 libX11 security advisory: May 18, 2021", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "http://www.openwall.com/lists/oss-security/2021/05/18/2"}, {"name": "20210520 CVE-2021-31535 libX11 Insufficient Length Checks PoC and Archeology", "tags": ["mailing-list", "x_refsource_FULLDISC"], "url": "http://seclists.org/fulldisclosure/2021/May/52"}, {"tags": ["x_refsource_MISC"], "url": "http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html"}, {"name": "[debian-lts-announce] 20210524 [SECURITY] [DLA 2666-1] libx11 security update", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00021.html"}, {"name": "DSA-4920", "tags": ["vendor-advisory", "x_refsource_DEBIAN"], "url": "https://www.debian.org/security/2021/dsa-4920"}, {"name": "GLSA-202105-16", "tags": ["vendor-advisory", "x_refsource_GENTOO"], "url": "https://security.gentoo.org/glsa/202105-16"}, {"tags": ["x_refsource_MISC"], "url": "https://www.openwall.com/lists/oss-security/2021/05/18/3"}, {"tags": ["x_refsource_MISC"], "url": "https://www.openwall.com/lists/oss-security/2021/05/18/2"}, {"tags": ["x_refsource_MISC"], "url": "https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/"}, {"tags": ["x_refsource_MISC"], "url": "https://lists.x.org/archives/xorg-announce/2021-May/003088.html"}, {"tags": ["x_refsource_MISC"], "url": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://security.netapp.com/advisory/ntap-20210813-0001/"}, {"name": "FEDORA-2021-62bb9998b2", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/"}, {"name": "[kafka-dev] 20210831 Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E"}, {"name": "[kafka-users] 20210831 Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E"}, {"name": "[kafka-users] 20210901 Re: [EXTERNAL] Re: Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E"}, {"name": "[kafka-dev] 20210901 Re: [EXTERNAL] Re: Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-31535", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. 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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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt", "refsource": "MISC", "url": "https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt"}, {"name": "https://lists.freedesktop.org/archives/xorg/", "refsource": "MISC", "url": "https://lists.freedesktop.org/archives/xorg/"}, {"name": "[oss-security] 20210518 libX11 security advisory: May 18, 2021", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/05/18/2"}, {"name": "20210520 CVE-2021-31535 libX11 Insufficient Length Checks PoC and Archeology", "refsource": "FULLDISC", "url": "http://seclists.org/fulldisclosure/2021/May/52"}, {"name": "http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html", "refsource": "MISC", "url": "http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html"}, {"name": "[debian-lts-announce] 20210524 [SECURITY] [DLA 2666-1] libx11 security update", "refsource": "MLIST", "url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00021.html"}, {"name": "DSA-4920", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4920"}, {"name": "GLSA-202105-16", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202105-16"}, {"name": "https://www.openwall.com/lists/oss-security/2021/05/18/3", "refsource": "MISC", "url": "https://www.openwall.com/lists/oss-security/2021/05/18/3"}, {"name": "https://www.openwall.com/lists/oss-security/2021/05/18/2", "refsource": "MISC", "url": "https://www.openwall.com/lists/oss-security/2021/05/18/2"}, {"name": "https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/", "refsource": "MISC", "url": "https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/"}, {"name": "https://lists.x.org/archives/xorg-announce/2021-May/003088.html", "refsource": "MISC", "url": "https://lists.x.org/archives/xorg-announce/2021-May/003088.html"}, {"name": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605", "refsource": "MISC", "url": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605"}, {"name": "https://security.netapp.com/advisory/ntap-20210813-0001/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20210813-0001/"}, {"name": "FEDORA-2021-62bb9998b2", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/"}, {"name": 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"https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://lists.x.org/archives/xorg-announce/2021-May/003088.html"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://security.netapp.com/advisory/ntap-20210813-0001/"}, {"name": "FEDORA-2021-62bb9998b2", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/"}, {"name": "[kafka-dev] 20210831 Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker image", "tags": ["mailing-list", "x_refsource_MLIST", "x_transferred"], "url": 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"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2021-31535", "datePublished": "2021-05-27T12:26:26.000Z", "dateReserved": "2021-04-21T00:00:00.000Z", "dateUpdated": "2024-08-03T23:03:33.270Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*", "matchCriteriaId": "AC5EF16E-76E0-4A32-9CF8-272B013E9F9C", "versionEndExcluding": "1.7.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:x.org:x_window_system:*:*:*:*:*:*:*:*", "matchCriteriaId": "856DA4F8-78C3-4FC3-BC21-CD1A3C98FFA4", "versionEndIncluding": "x11r7.7", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "matchCriteriaId": "E460AA51-FCDA-46B9-AE97-E6676AA5E194", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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. 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). 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. 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"}], "id": "CVE-2021-31535", "lastModified": "2026-06-17T03:51:58.060", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-05-27T13:15:08.240", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "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": ["Third Party Advisory"], "url": 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"https://lists.debian.org/debian-lts-announce/2021/05/msg00021.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.freedesktop.org/archives/xorg/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://lists.x.org/archives/xorg-announce/2021-May/003088.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202105-16"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20210813-0001/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4920"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://www.openwall.com/lists/oss-security/2021/05/18/2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://www.openwall.com/lists/oss-security/2021/05/18/3"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHBA-2021:3472", "cpe": "cpe:/a:redhat:ansible_automation_platform:3.8::el7", "package": "ansible-tower-38/ansible-tower-rhel7:3.8.4-1", "product_name": "Red Hat Ansible Tower 3.8 for RHEL 7", "release_date": "2021-09-08T00:00:00Z"}, {"advisory": "RHSA-2021:3296", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "libX11-0:1.6.7-4.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-08-30T00:00:00Z"}, {"advisory": "RHSA-2021:4326", "cpe": "cpe:/a:redhat:enterprise_linux:8", "impact": "moderate", "package": "libX11-0:1.6.8-5.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-09T00:00:00Z"}, {"advisory": "RHSA-2021:3477", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:4.3.18-20210903.0.el7_9", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2021-09-09T00:00:00Z"}], "bugzilla": {"description": "libX11: missing request length checks", "id": "1961822", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1961822"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-20->CWE-77", "details": ["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.", "A missing validation flaw was found in libX11. This flaw allows an attacker to inject X11 protocol commands on X clients, and in some cases, also bypass, authenticate (via injection of control characters), or potentially execute arbitrary code with permissions of the application compiled with libX11. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability."], "mitigation": {"lang": "en:us", "value": "xterm should not be used to display less trusted data, e.g. from SSH connections to less trusted remote machines.\nTo avoid attacks via .Xdefaults on kiosk type machines, where graphical user has no permission to execute arbitrary operating system commands or sometimes not even to send hardware keyboard keystrokes, the .Xdefaults must not be modifiable by the user."}, "name": "CVE-2021-31535", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "libX11", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "impact": "moderate", "package_name": "libX11", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-05-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-31535\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-31535\nhttps://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/\nhttps://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt"], "statement": "This flaw was rated with an important severity as it allows an attacker to inject X11 protocol commands on X clients with the privileges of the application linked with the libX11 library, potentially having administrative privileges. However, Red Hat Enterprise Linux 8 and 9 do not run the Xorg server with root privileges, lowering the security impact of this issue. For this reason, Red Hat Enterprise Linux 8 and 9 have been rated with a moderate severity.", "threat_severity": "Important"}

{}