X.Org X server: Multiple vulnerabilities
1.
Gentoo Linux Security Advisory
Version Information
| Advisory Reference |
GLSA 200806-07 / xorg-server |
| Release Date |
June 19, 2008 |
| Latest Revision |
June 19, 2008: 01 |
| Impact |
high |
| Exploitable |
remote, local |
| Package |
Vulnerable versions |
Unaffected versions |
Architecture(s) |
| x11-base/xorg-server |
<
1.3.0.0-r6 |
>=
1.3.0.0-r6 |
All supported architectures
|
Related bugreports:
#225419
Synopsis
Multiple vulnerabilities have been discovered in the X.Org X server,
possibly allowing for the remote execution of arbitrary code with root
privileges.
2.
Impact Information
Background
The X Window System is a graphical windowing system based on a
client/server model.
Description
Regenrecht reported multiple vulnerabilities in various X server
extensions via iDefense:
- The
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
(CVE-2008-1379).
- 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
SProcRenderCreateLinearGradient(), SProcRenderCreateRadialGradient()
and SProcRenderCreateConicalGradient() functions (CVE-2008-2362).
Impact
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.
3.
Resolution Information
Workaround
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
places:
Code Listing 3.1: Workaround |
Section "Extensions"
Option "MIT-SHM" "disable"
Option "RENDER" "disable"
Option "SECURITY" "disable"
EndSection
Section "Module"
Disable "record"
EndSection
|
Resolution
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-1.3.0.0-r6"
|
4.
References
|
