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.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libX11: Out of Bounds write in XListExtensions in ListExt.c (CVE-2018-14600)

  - The XGetImage function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via     vectors involving image type and geometry, which triggers out-of-bounds read operations. (CVE-2016-7942)

  - 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. (CVE-2016-7943)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libX11: Out of Bounds write in XListExtensions in ListExt.c (CVE-2018-14600)

  - Multiple integer overflows in X.org libX11 1.5.99.901 (1.6 RC1) and earlier allow X servers to trigger     allocation of insufficient memory and a buffer overflow via vectors related to the (1) XQueryFont, (2)
    _XF86BigfontQueryFont, (3) XListFontsWithInfo, (4) XGetMotionEvents, (5) XListHosts, (6)     XGetModifierMapping, (7) XGetPointerMapping, (8) XGetKeyboardMapping, (9) XGetWindowProperty, (10)     XGetImage, (11) LoadColornameDB, (12) XrmGetFileDatabase, (13) _XimParseStringFile, or (14) TransFileName     functions. (CVE-2013-1981)

  - Multiple buffer overflows in X.org libX11 1.5.99.901 (1.6 RC1) and earlier allow X servers to cause a     denial of service (crash) and possibly execute arbitrary code via crafted length or index values to the     (1) XAllocColorCells, (2) _XkbReadGetDeviceInfoReply, (3) _XkbReadGeomShapes, (4)
    _XkbReadGetGeometryReply, (5) _XkbReadKeySyms, (6) _XkbReadKeyActions, (7) _XkbReadKeyBehaviors, (8)
    _XkbReadModifierMap, (9) _XkbReadExplicitComponents, (10) _XkbReadVirtualModMap, (11)
    _XkbReadGetNamesReply, (12) _XkbReadGetMapReply, (13) _XimXGetReadData, (14) XListFonts, (15)     XListExtensions, and (16) XGetFontPath functions. (CVE-2013-1997)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - libX11: Insufficient validation of server responses in FontNames (CVE-2016-7943)

  - The XGetImage function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via     vectors involving image type and geometry, which triggers out-of-bounds read operations. (CVE-2016-7942)

  - An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was     implemented in libX11 before version 1.6.10. As per upstream this is security relevant when setuid     programs call XIM client functions while running with elevated privileges. No such programs are shipped     with Red Hat Enterprise Linux. (CVE-2020-14344)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

According to the versions of the libX11 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - The XGetImage function in X.org libX11 before 1.6.4     might allow remote X servers to gain privileges via     vectors involving image type and geometry, which     triggers out-of-bounds read operations.(CVE-2016-7942)

  - 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.(CVE-2016-7943)

  - An issue was discovered in XListExtensions in ListExt.c     in libX11 through 1.6.5. A malicious server can send a     reply in which the first string overflows, causing a     variable to be set to NULL that will be freed later on,     leading to DoS (segmentation fault).(CVE-2018-14598)

  - An issue was discovered in libX11 through 1.6.5. The     function XListExtensions in ListExt.c is vulnerable to     an off-by-one error caused by malicious server     responses, leading to DoS or possibly unspecified other     impact.(CVE-2018-14599)

  - An issue was discovered in libX11 through 1.6.5. The     function XListExtensions in ListExt.c interprets a     variable as signed instead of unsigned, resulting in an     out-of-bounds write (of up to 128 bytes), leading to     DoS or remote code execution.(CVE-2018-14600)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3758-1 advisory.

    Tobias Stoeckmann discovered that libx11 incorrectly handled certain images. An attacker could possibly     use this issue to access sensitive information (CVE-2016-7942)

    Tobias Stoeckmann discovered that libx11 incorrectly handled certain inputs. An attacker could possibly     use this issue to access sensitive information. (CVE-2016-7943)

    It was discovered that libx11 incorrectly handled certain inputs. An attacker could possibly use this     issue to cause a denial of service. (CVE-2018-14598, CVE-2018-14599, CVE-2018-14600)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-201704-03 (X.Org: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in X.Org server and       libraries. Please review the CVE identifiers referenced below for       details.
  Impact :

    A local or remote users can utilize the vulnerabilities to attach to the       X.Org session as a user and execute arbitrary code.
  Workaround :

    There is no known workaround at this time.

Security fix for CVE-2016-7942, CVE-2016-7943

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

New x11 packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues.

ID	Name	Product	Family	Severity
198683	RHEL 6 : libx11 (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
198680	RHEL 5 : libx11 (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
198676	RHEL 7 : libx11 (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
196725	RHEL 5 : libx11 (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	critical
196712	RHEL 7 : libx11 (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	critical
196634	RHEL 6 : libx11 (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	critical
131633	EulerOS 2.0 SP2 : libX11 (EulerOS-SA-2019-2480)	Nessus	Huawei Local Security Checks	critical
112205	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : libx11 vulnerabilities (USN-3758-1)	Nessus	Ubuntu Local Security Checks	critical
99276	GLSA-201704-03 : X.Org: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
94774	Fedora 25 : libX11 (2016-0df69ab477)	Nessus	Fedora Local Security Checks	critical
94439	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : x11 (SSA:2016-305-02)	Nessus	Slackware Local Security Checks	critical

Detections

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CVE-2016-7943

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