Debian DLA-1482-1 : libx11 security update
High Nessus Plugin ID 112184
SynopsisThe remote Debian host is missing a security update.
DescriptionSeveral 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 2:1.6.2-3+deb8u2.
We recommend that you upgrade your libx11 packages.
NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpgrade the affected packages.