In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are incorrectly skipped in situations involving ? characters.

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.

  - libXfont: Insufficient input validation in pcfread.c (CVE-2017-13722)

  - In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an     attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts,     leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are     incorrectly skipped in situations involving ? characters. (CVE-2017-13720)

  - In libXfont before 1.5.4 and libXfont2 before 2.0.3, a local attacker can open (but not read) files on the     system as root, triggering tape rewinds, watchdogs, or similar mechanisms that can be triggered by opening     files. (CVE-2017-16611)

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 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.

  - libXfont: Insufficient input validation in pcfread.c (CVE-2017-13722)

  - In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an     attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts,     leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are     incorrectly skipped in situations involving ? characters. (CVE-2017-13720)

  - In libXfont before 1.5.4 and libXfont2 before 2.0.3, a local attacker can open (but not read) files on the     system as root, triggering tape rewinds, watchdogs, or similar mechanisms that can be triggered by opening     files. (CVE-2017-16611)

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.

  - libXfont: Insufficient input validation in pcfread.c (CVE-2017-13722)

  - In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an     attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts,     leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are     incorrectly skipped in situations involving ? characters. (CVE-2017-13720)

  - In libXfont before 1.5.4 and libXfont2 before 2.0.3, a local attacker can open (but not read) files on the     system as root, triggering tape rewinds, watchdogs, or similar mechanisms that can be triggered by opening     files. (CVE-2017-16611)

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 libXfont package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - In libXfont before 1.5.4 and libXfont2 before 2.0.3, a     local attacker can open (but not read) files on the     system as root, triggering tape rewinds, watchdogs, or     similar mechanisms that can be triggered by opening     files.(CVE-2017-16611)

  - In the pcfGetProperties function in bitmap/pcfread.c in     libXfont through 1.5.2 and 2.x before 2.0.2, a missing     boundary check (for PCF files) could be used by local     attackers authenticated to an Xserver for a buffer     over-read, for information disclosure or a crash of the     X server.(CVE-2017-13722)

  - In the PatternMatch function in fontfile/fontdir.c in     libXfont through 1.5.2 and 2.x before 2.0.2, an     attacker with access to an X connection can cause a     buffer over-read during pattern matching of fonts,     leading to information disclosure or a crash (denial of     service). This occurs because '\0' characters are     incorrectly skipped in situations involving ?     characters.(CVE-2017-13720)

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.

According to the versions of the libXfont package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - In libXfont before 1.5.4 and libXfont2 before 2.0.3, a     local attacker can open (but not read) files on the     system as root, triggering tape rewinds, watchdogs, or     similar mechanisms that can be triggered by opening     files.(CVE-2017-16611)

  - In the pcfGetProperties function in bitmap/pcfread.c in     libXfont through 1.5.2 and 2.x before 2.0.2, a missing     boundary check (for PCF files) could be used by local     attackers authenticated to an Xserver for a buffer     over-read, for information disclosure or a crash of the     X server.(CVE-2017-13722)

  - In the PatternMatch function in fontfile/fontdir.c in     libXfont through 1.5.2 and 2.x before 2.0.2, an     attacker with access to an X connection can cause a     buffer over-read during pattern matching of fonts,     leading to information disclosure or a crash (denial of     service). This occurs because '\\0' characters are     incorrectly skipped in situations involving ?     characters.(CVE-2017-13720)

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.

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

  - In libXfont before 1.5.4 and libXfont2 before 2.0.3, a     local attacker can open (but not read) files on the     system as root, triggering tape rewinds, watchdogs, or     similar mechanisms that can be triggered by opening     files.(CVE-2017-16611)

  - In the PatternMatch function in fontfile/fontdir.c in     libXfont through 1.5.2 and 2.x before 2.0.2, an     attacker with access to an X connection can cause a     buffer over-read during pattern matching of fonts,     leading to information disclosure or a crash (denial of     service). This occurs because '\0' characters are     incorrectly skipped in situations involving ?     characters.(CVE-2017-13720)

  - In the pcfGetProperties function in bitmap/pcfread.c in     libXfont through 1.5.2 and 2.x before 2.0.2, a missing     boundary check (for PCF files) could be used by local     attackers authenticated to an Xserver for a buffer     over-read, for information disclosure or a crash of the     X server.(CVE-2017-13722)

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.

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

  - The LZW decompressor in (1) the BufCompressedFill     function in fontfile/decompress.c in X.Org libXfont     before 1.4.4 and (2) compress/compress.c in 4.3BSD, as     used in zopen.c in OpenBSD before 3.8, FreeBSD, NetBSD     4.0.x and 5.0.x before 5.0.3 and 5.1.x before 5.1.1,     FreeType 2.1.9, and other products, does not properly     handle code words that are absent from the     decompression table when encountered, which allows     context-dependent attackers to trigger an infinite loop     or a heap-based buffer overflow, and possibly execute     arbitrary code, via a crafted compressed stream, a     related issue to CVE-2006-1168 and     CVE-2011-2896.(CVE-2011-2895)

  - In the pcfGetProperties function in bitmap/pcfread.c in     libXfont through 1.5.2 and 2.x before 2.0.2, a missing     boundary check (for PCF files) could be used by local     attackers authenticated to an Xserver for a buffer     over-read, for information disclosure or a crash of the     X server.(CVE-2017-13722)

  - In the PatternMatch function in fontfile/fontdir.c in     libXfont through 1.5.2 and 2.x before 2.0.2, an     attacker with access to an X connection can cause a     buffer over-read during pattern matching of fonts,     leading to information disclosure or a crash (denial of     service). This occurs because '\0' characters are     incorrectly skipped in situations involving ?     characters.(CVE-2017-13720)

  - In libXfont before 1.5.4 and libXfont2 before 2.0.3, a     local attacker can open (but not read) files on the     system as root, triggering tape rewinds, watchdogs, or     similar mechanisms that can be triggered by opening     files.(CVE-2017-16611)

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.

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

  - In the PatternMatch function in fontfile/fontdir.c in     libXfont through 1.5.2 and 2.x before 2.0.2, an     attacker with access to an X connection can cause a     buffer over-read during pattern matching of fonts,     leading to information disclosure or a crash (denial of     service). This occurs because '\0' characters are     incorrectly skipped in situations involving ?     characters.(CVE-2017-13720)

  - In the pcfGetProperties function in bitmap/pcfread.c in     libXfont through 1.5.2 and 2.x before 2.0.2, a missing     boundary check (for PCF files) could be used by local     attackers authenticated to an Xserver for a buffer     over-read, for information disclosure or a crash of the     X server.(CVE-2017-13722)

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.

This update for libXfont fixes several issues. These security issues were fixed :

  - CVE-2017-13720: Improper check for end of string in     PatterMatch caused invalid reads (bsc#1054285)

  - CVE-2017-13722: Malformed PCF file could have caused DoS     or leak information (bsc#1049692)

  - Prevent the X server from accessing arbitrary files as     root. It is not possible to leak information, but     special files can be touched allowing for causing side     effects (bsc#1050459)

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

This update for libXfont fixes several issues.

These security issues were fixed :

  - CVE-2017-13720: Improper check for end of string in     PatterMatch caused invalid reads (bsc#1054285)

  - CVE-2017-13722: Malformed PCF file could have caused DoS     or leak information (bsc#1049692)

  - Prevent the X server from accessing arbitrary files as     root. It is not possible to leak information, but     special files can be touched allowing for causing side     effects (bsc#1050459)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

This update for xorg-x11-libs fixes several issues. These security issues were fixed :

  - CVE-2017-16612: Heap overflows due to an integer     overflow while parsing images and a signedness issue     while parsing comments (bsc#1065386).

  - CVE-2017-13720: Improper check for end of string in     PatterMatch caused invalid reads (bsc#1054285)

  - CVE-2017-13722: Malformed PCF file could have caused DoS     or leak information (bsc#1049692)

  - Prevent the X server from accessing arbitrary files as     root. It is not possible to leak information, but     special files can be touched allowing for causing side     effects (bsc#1050459)

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

Security fix for CVE-2017-13720 and CVE-2017-13722

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.

The freedesktop.org project reports :

If a pattern contains '?' character, any character in the string is skipped, even if it is '\0'. The rest of the matching then reads invalid memory.

Without the checks a malformed PCF file can cause the library to make atom from random heap memory that was behind the `strings` buffer.
This may crash the process or leak information.

This update for libXfont fixes several issues.

These security issues were fixed :

  - CVE-2017-13720: Improper check for end of string in     PatterMatch caused invalid reads (bsc#1054285)

  - CVE-2017-13722: Malformed PCF file could have caused DoS     or leak information (bsc#1049692)

  - Prevent the X server from accessing arbitrary files as     root. It is not possible to leak information, but     special files can be touched allowing for causing side     effects (bsc#1050459)

The remote host is affected by the vulnerability described in GLSA-201711-08 (LibXfont, LibXfont2: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in LibXfont and LibXfont2.
      Please review the referenced CVE identifiers for details.
  Impact :

    Local attackers could obtain sensitive information or possibly cause a       Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3442-1 advisory.

    It was discovered that libXfont incorrectly handled certain patterns in PatternMatch. A local attacker     could use this issue to cause libXfont to crash, resulting in a denial of service, or possibly obtain     sensitive information. (CVE-2017-13720)

    It was discovered that libXfont incorrectly handled certain malformed PCF files. A local attacker could     use this issue to cause libXfont to crash, resulting in a denial of service, or possibly obtain sensitive     information. (CVE-2017-13722)

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.

Two vulnerabilities were found in libXfont, the X11 font rasterisation library, which could result in denial of service or memory disclosure.

ID	Name	Product	Family	Severity
199653	RHEL 5 : libxfont (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
199628	RHEL 6 : libxfont (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
199583	RHEL 7 : libxfont (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
195847	RHEL 7 : libxfont (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
195816	RHEL 5 : libxfont (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
195775	RHEL 6 : libxfont (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
135621	EulerOS Virtualization 3.0.2.2 : libXfont (EulerOS-SA-2020-1459)	Nessus	Huawei Local Security Checks	high
134530	EulerOS Virtualization for ARM 64 3.0.2.0 : libXfont (EulerOS-SA-2020-1241)	Nessus	Huawei Local Security Checks	high
132160	EulerOS 2.0 SP3 : libXfont (EulerOS-SA-2019-2625)	Nessus	Huawei Local Security Checks	high
131849	EulerOS 2.0 SP2 : libXfont (EulerOS-SA-2019-2357)	Nessus	Huawei Local Security Checks	high
131813	EulerOS 2.0 SP5 : libXfont (EulerOS-SA-2019-2539)	Nessus	Huawei Local Security Checks	high
106576	SUSE SLED12 / SLES12 Security Update : libXfont (SUSE-SU-2018:0334-1)	Nessus	SuSE Local Security Checks	high
106569	openSUSE Security Update : libXfont (openSUSE-2018-124)	Nessus	SuSE Local Security Checks	high
106449	SUSE SLES11 Security Update : xorg-x11-libs (SUSE-SU-2018:0246-1)	Nessus	SuSE Local Security Checks	high
106003	Fedora 27 : libXfont (2017-f3e5d31524)	Nessus	Fedora Local Security Checks	high
105336	FreeBSD : libXfont -- multiple memory leaks (3b9590a1-e358-11e7-a293-54e1ad3d6335)	Nessus	FreeBSD Local Security Checks	high
105240	openSUSE Security Update : libXfont (openSUSE-2017-1357)	Nessus	SuSE Local Security Checks	high
104516	GLSA-201711-08 : LibXfont, LibXfont2: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
104157	Fedora 25 : libXfont (2017-b7c4334524)	Nessus	Fedora Local Security Checks	high
104148	Fedora 26 : libXfont (2017-2783ef2c63)	Nessus	Fedora Local Security Checks	high
103774	Ubuntu 14.04 LTS / 16.04 LTS : libXfont vulnerabilities (USN-3442-1)	Nessus	Ubuntu Local Security Checks	high
103757	Debian DSA-3995-1 : libxfont - security update	Nessus	Debian Local Security Checks	high

Detections

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CVE-2017-13720

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Tenable Plugins

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