Multiple vulnerabilities have been discovered in the X.Org X server and Xfont library, allowing for a local privilege escalation and arbitrary code execution.
|Package||x11-base/xorg-server on all architectures|
|Affected versions||< 188.8.131.52-r5|
|Unaffected versions||>= 184.108.40.206-r5|
|Package||x11-libs/libXfont on all architectures|
|Affected versions||< 1.3.1-r1|
|Unaffected versions||>= 1.3.1-r1|
The X Window System is a graphical windowing system based on a client/server model.
regenrecht reported multiple vulnerabilities in various X server extension via iDefense:
Remote attackers could exploit the vulnerability in the Xfont library by enticing a user to load a specially crafted PCF font file resulting in the execution of arbitrary code with the privileges of the user running the X server, typically root. Local attackers could exploit this and the vulnerabilities in the X.org extensions to gain elevated privileges. If the X server allows connections from the network, these vulnerabilities could be exploited remotely. A local attacker could determine the existence of arbitrary files by exploiting the last vulnerability or possibly cause a Denial of Service.
Workarounds for some of the vulnerabilities can be found in the X.Org security advisory as listed under References.
All X.Org X server users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-220.127.116.11-r5"
All X.Org Xfont library users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=x11-libs/libXfont-1.3.1-r1"