Ubuntu 12.04 LTS / 12.10 / 13.04 : xorg-server, xorg-server-lts-quantal, xorg-server-lts-raring vulnerabilities (USN-1990-1)
Medium Nessus Plugin ID 70492
SynopsisThe remote Ubuntu host is missing one or more security-related patches.
DescriptionPedro Ribeiro discovered that the X.Org X server incorrectly handled memory operations when handling ImageText requests. An attacker could use this issue to cause X.Org to crash, or to possibly execute arbitrary code. (CVE-2013-4396)
It was discovered that non-root X.Org X servers such as Xephyr incorrectly used cached xkb files. A local attacker could use this flaw to cause a xkb cache file to be loaded by another user, resulting in a denial of service. (CVE-2013-1056).
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.
SolutionUpdate the affected xserver-xorg-core, xserver-xorg-core-lts-quantal and / or xserver-xorg-core-lts-raring packages.