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AUSCERT External Security Bulletin Redistribution
[DLA 1482-1] libx11 security update
30 August 2018
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
CVE Names: CVE-2018-14600 CVE-2018-14599 CVE-2018-14598
Comment: This advisory references vulnerabilities in products which run on
platforms other than Debian. It is recommended that administrators
running libx11 check for an updated version of the software for
their operating system.
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Package : libx11
Version : 2:1.6.2-3+deb8u2
CVE ID : CVE-2018-14598 CVE-2018-14599 CVE-2018-14600
Several issues were discovered in libx11, the client interface to the
X Windows System. The functions XGetFontPath, XListExtensions, and
XListFonts are vulnerable to an off-by-one override on malicious
server responses. A malicious server could also send a reply in which
the first string overflows, causing a variable set to NULL that will
be freed later on, leading to a segmentation fault and Denial of
Service. 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 a Denial of Service or possibly
remote code execution.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your libx11 packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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