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CVE-2016-7943 (GCVE-0-2016-7943)

Vulnerability from cvelistv5 – Published: 2016-12-13 20:00 – Updated: 2024-08-06 02:13
VLAI
Summary
The XListFonts function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving length fields, which trigger out-of-bounds write operations.
Severity
9.8 (Critical)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
URL Tags
http://www.securitytracker.com/id/1036945 vdb-entryx_refsource_SECTRACK
https://usn.ubuntu.com/3758-2/ vendor-advisoryx_refsource_UBUNTU
https://cgit.freedesktop.org/xorg/lib/libX11/comm… x_refsource_CONFIRM
https://security.gentoo.org/glsa/201704-03 vendor-advisoryx_refsource_GENTOO
https://lists.x.org/archives/xorg-announce/2016-O… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2016/10/04/4 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2016/10/04/2 mailing-listx_refsource_MLIST
http://www.securityfocus.com/bid/93362 vdb-entryx_refsource_BID
https://usn.ubuntu.com/3758-1/ vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
Date Public
2016-10-04 00:00
Show details on NVD website
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      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-787\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2016-7943\",\"sourceIdentifier\":\"security@opentext.com\",\"published\":\"2016-12-13T20:59:07.520\",\"lastModified\":\"2026-05-06T22:30:45.220\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The XListFonts function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving length fields, which trigger out-of-bounds write operations.\"},{\"lang\":\"es\",\"value\":\"La funci\u00f3n XListFonts en X.org libX11 en versiones anteriores a 1.6.4 podr\u00eda permitir a servidores remotos X obtener privilegios a trav\u00e9s de vectores que involucran campos de longitud, que desencadena operaciones de escritura fuera de l\u00edmites.\"}],\"metrics\":{\"cvssMetricV30\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.0\",\"vectorString\":\"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"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\",\"baseScore\":7.5,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"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-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"772E9557-A371-4664-AE2D-4135AAEB89AA\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"1.6.3\",\"matchCriteriaId\":\"BB918EC4-C59E-46FD-BC0C-34AC76E0C1A2\"}]}]}],\"references\":[{\"url\":\"http://www.openwall.com/lists/oss-security/2016/10/04/2\",\"source\":\"security@opentext.com\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2016/10/04/4\",\"source\":\"security@opentext.com\"},{\"url\":\"http://www.securityfocus.com/bid/93362\",\"source\":\"security@opentext.com\"},{\"url\":\"http://www.securitytracker.com/id/1036945\",\"source\":\"security@opentext.com\"},{\"url\":\"https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8c29f1607a31dac0911e45a0dd3d74173822b3c9\",\"source\":\"security@opentext.com\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GMCVDXMFPXR7QGMKDG22WPPJCXH2X3L7/\",\"source\":\"security@opentext.com\"},{\"url\":\"https://lists.x.org/archives/xorg-announce/2016-October/002720.html\",\"source\":\"security@opentext.com\"},{\"url\":\"https://security.gentoo.org/glsa/201704-03\",\"source\":\"security@opentext.com\"},{\"url\":\"https://usn.ubuntu.com/3758-1/\",\"source\":\"security@opentext.com\"},{\"url\":\"https://usn.ubuntu.com/3758-2/\",\"source\":\"security@opentext.com\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2016/10/04/2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2016/10/04/4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.securityfocus.com/bid/93362\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.securitytracker.com/id/1036945\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8c29f1607a31dac0911e45a0dd3d74173822b3c9\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GMCVDXMFPXR7QGMKDG22WPPJCXH2X3L7/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.x.org/archives/xorg-announce/2016-October/002720.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://security.gentoo.org/glsa/201704-03\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://usn.ubuntu.com/3758-1/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://usn.ubuntu.com/3758-2/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T11:57:07+00:00",
      "cve": "CVE-2016-7943",
      "id": "CVE-2016-7943",
      "initial_release_date": "2016-09-25T00:00:00+00:00",
      "product_status:known_affected": "9",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libX11: Insufficient validation of server responses in FontNames",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-7943.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2025-07-02T03:53:02Z",
      "cve": "CVE-2016-7943",
      "id": "CVE-2016-7943",
      "initial_release_date": "2023-02-15T04:57:25Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2016-7943",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2016-7943.json",
      "version": "6"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.