Technical Description

Multiple vulnerabilities have been identified in X.org X11, which could be exploited by local attackers to disclose sensitive information, cause a denial of service or gain elevated privileges. These issues are caused by integer overflow and memory corruption errors in the "AllocateGlyph()", "SProcRenderCreateLinearGradient()", "SProcRenderCreateRadialGradient()", "SProcRenderCreateConicalGradient()", "ShmPutImage()", "SProcSecurityGenerateAuthorization()" and "SProcRecordCreateContext()" functions when processing user-supplied data and requests, which could be exploited by malicious users to crash an affected server, read parts of memory in the X server process, or execute arbitrary code with the privileges of the X server.

Affected Products

X.org X11 version R7.3 and prior

Solution

Apply patches :
ftp://ftp.freedesktop.org/pub/xorg/X11R7.3/patches/xorg-xserver-1.4-cve-2008-1377.diff
ftp://ftp.freedesktop.org/pub/xorg/X11R7.3/patches/xorg-xserver-1.4-cve-2008-1379.diff
ftp://ftp.freedesktop.org/pub/xorg/X11R7.3/patches/xorg-xserver-1.4-cve-2008-2360.diff
ftp://ftp.freedesktop.org/pub/xorg/X11R7.3/patches/xorg-xserver-1.4-cve-2008-2361.diff
ftp://ftp.freedesktop.org/pub/xorg/X11R7.3/patches/xorg-xserver-1.4-cve-2008-2362.diff

References

http://www.vupen.com/english/advisories/2008/1803
http://lists.freedesktop.org/archives/xorg/2008-June/036026.html
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=718
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=719
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=720
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=721
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=722

Credits

Vulnerabilities reported by regenrecht via iDefense Labs.

ChangeLog

2008-06-11 : Initial release

Vulnerability Management

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