GLSA Advocate
Joined: 12 May 2004 Posts: 2663
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Posted: Thu Jun 19, 2008 6:26 pm Post subject: [ GLSA 200806-07 ] X.Org X server: Multiple vulnerabilities |
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Gentoo Linux Security Advisory
Title: X.Org X server: Multiple vulnerabilities (GLSA 200806-07)
Severity: high
Exploitable: remote, local
Date: June 19, 2008
Bug(s): #225419
ID: 200806-07
Synopsis
Multiple vulnerabilities have been discovered in the X.Org X server,
possibly allowing for the remote execution of arbitrary code with root
privileges.
Background
The X Window System is a graphical windowing system based on a
client/server model.
Affected Packages
Package: x11-base/xorg-server
Vulnerable: < 1.3.0.0-r6
Unaffected: >= 1.3.0.0-r6
Architectures: All supported architectures
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.
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: |
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: | # emerge --sync
# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r6" |
References
CVE-2008-1377
CVE-2008-1379
CVE-2008-2360
CVE-2008-2361
CVE-2008-2362
Last edited by GLSA on Sun Jul 25, 2010 4:26 am; edited 2 times in total |
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