USN-1990-1: X.Org X server vulnerabilities

Packages

xorg-server - X.Org X11 server
xorg-server-lts-quantal - X.Org X11 server
xorg-server-lts-raring - X.Org X11 server

Details

Pedro 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)

Pedro 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)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

Ubuntu Release	Package Version
13.04 raring	xserver-xorg-core – 2:1.13.3-0ubuntu6.2
12.10 quantal	xserver-xorg-core – 2:1.13.0-0ubuntu6.4
12.04 precise	xserver-xorg-core-lts-quantal – 2:1.13.0-0ubuntu6.1~precise4
	xserver-xorg-core – 2:1.11.4-0ubuntu10.14
	xserver-xorg-core-lts-raring – 2:1.13.3-0ubuntu6~precise3

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References