X.Org X server: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 200806-07 / xorg-server
||June 19, 2008
||June 19, 2008: 01
All supported architectures
Multiple vulnerabilities have been discovered in the X.Org X server,
possibly allowing for the remote execution of arbitrary code with root
The X Window System is a graphical windowing system based on a
Regenrecht reported multiple vulnerabilities in various X server
extensions via iDefense:
SProcSecurityGenerateAuthorization() and SProcRecordCreateContext()
functions of the RECORD and Security extensions are lacking proper
parameter validation (CVE-2008-1377).
- An integer overflow is
possible in the function ShmPutImage() of the MIT-SHM extension
- The RENDER extension contains several
possible integer overflows in the AllocateGlyph() function
(CVE-2008-2360) which could possibly lead to a heap-based buffer
overflow. Further possible integer overflows have been found in the
ProcRenderCreateCursor() function (CVE-2008-2361) as well as in the
and SProcRenderCreateConicalGradient() functions (CVE-2008-2362).
Exploitation of these vulnerabilities could possibly lead to the remote
execution of arbitrary code with root privileges, if the server is
running as root, which is the default. It is also possible to crash the
server by making use of these vulnerabilities.
It is possible to avoid these vulnerabilities by disabling the affected
server extensions. Therefore edit the configuration file
(/etc/X11/xorg.conf) to contain the following in the appropriate
Code Listing 3.1: Workaround
Option "MIT-SHM" "disable"
Option "RENDER" "disable"
Option "SECURITY" "disable"
All X.org X Server users should upgrade to the latest version:
Code Listing 3.2: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-188.8.131.52-r6"