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.

The remote Debian 9 host has packages installed that are affected by a vulnerability as referenced in the dla-2901 advisory.

  - 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 this issue but has instead relied only on the application's self-reported version number.

According to the version of the libXfont2 package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - 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 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 version of the libXfont package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - 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.

Security fix for CVE-2017-16611

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 remote host is affected by the vulnerability described in GLSA-201801-10 (LibXfont, LibXfont2: Arbitrary file access)

    It was discovered that libXfont incorrectly followed symlinks when       opening font files.
  Impact :

    A local unprivileged user could use this flaw to cause the X server to       access arbitrary files, including special device files.
  Workaround :

    There is no known workaround at this time.

the freedesktop.org project reports :

A non-privileged X client can instruct X server running under root to open any file by creating own directory with 'fonts.dir', 'fonts.alias' or any font file being a symbolic link to any other file in the system. X server will then open it. This can be issue with special files such as /dev/watchdog.

It was discovered that libXfont incorrectly followed symlinks when opening font files. A local unprivileged user could use this issue to cause the X server to access arbitrary files, including special device files.

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

New libXfont packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and 14.2 to fix a security issue.

ID	Name	Product	Family	Severity
157254	Debian DLA-2901-1 : libxfont - LTS security update	Nessus	Debian Local Security Checks	medium
140962	EulerOS Virtualization for ARM 64 3.0.6.0 : libXfont2 (EulerOS-SA-2020-2014)	Nessus	Huawei Local Security Checks	medium
135621	EulerOS Virtualization 3.0.2.2 : libXfont (EulerOS-SA-2020-1459)	Nessus	Huawei Local Security Checks	high
134531	EulerOS Virtualization for ARM 64 3.0.2.0 : libXfont2 (EulerOS-SA-2020-1242)	Nessus	Huawei Local Security Checks	medium
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
131512	EulerOS Virtualization for ARM 64 3.0.3.0 : libXfont2 (EulerOS-SA-2019-2347)	Nessus	Huawei Local Security Checks	medium
130881	EulerOS 2.0 SP5 : libXfont (EulerOS-SA-2019-2172)	Nessus	Huawei Local Security Checks	medium
107177	Fedora 27 : libXfont (2018-e27b435a7f)	Nessus	Fedora Local Security Checks	medium
107167	Fedora 26 : libXfont (2018-5a7cd68500)	Nessus	Fedora Local Security Checks	medium
107164	Fedora 27 : libXfont2 (2018-4f5a3e792f)	Nessus	Fedora Local Security Checks	medium
107154	Fedora 26 : libXfont2 (2018-05b078c373)	Nessus	Fedora Local Security Checks	medium
105666	GLSA-201801-10 : LibXfont, LibXfont2: Arbitrary file access	Nessus	Gentoo Local Security Checks	medium
105335	FreeBSD : libXfont -- permission bypass when opening files through symlinks (08a125f3-e35a-11e7-a293-54e1ad3d6335)	Nessus	FreeBSD Local Security Checks	medium
104883	Ubuntu 14.04 LTS / 16.04 LTS : libXfont vulnerability (USN-3500-1)	Nessus	Ubuntu Local Security Checks	medium
104859	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 : libXfont (SSA:2017-333-02)	Nessus	Slackware Local Security Checks	medium

Detections

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CVE-2017-16611

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Tenable Plugins

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