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TITLE:
X.org X11 Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA30627

VERIFY ADVISORY:
http://secunia.com/advisories/30627/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information, Privilege escalation, DoS

WHERE:
Local system

SOFTWARE:
X Window System 11 (X11) 6.x
http://secunia.com/product/3913/
X Window System 11 (X11) 7.x
http://secunia.com/product/8806/

DESCRIPTION:
Some vulnerabilities have been reported in X.org X11, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service), disclose potentially sensitive information, or to gain
escalated privileges.

1) An integer overflow error when calculating the size of the glyph
exists in the "AllocateGlyph()" function within the Render extension.
This can be exploited to cause a heap-based buffer overflow via a
specially crafted request.

2) An integer overflow error when calculating the size of the glyph
in the "ProcRenderCreateCursor()" function within the Render
extension can be exploited to crash the X server via a specially
crafted request.

3) An integer overflow error exists in the Render extension when
parsing client requests for the "SProcRenderCreateLinearGradient",
"SProcRenderCreateRadialGradient", or
"SProcRenderCreateConicalGradient" functions and can be exploited to
corrupt heap memory.

4) Multiple input validation errors in the
"SProcSecurityGenerateAuthorization()", "SProcRecordCreateContext()",
and "SProcRecordRegisterClients()" functions within the Record and
Security extensions can be exploited to corrupt heap memory via
specially crafted requests.

Successful exploitation of vulnerabilities #1, #3, and #4 may allow
execution of arbitrary code with privileges of the X server
(typically root).

5) An integer overflow error when processing parameters to the
"ShmPutImage()" request can be exploited to disclose arbitrary memory
of the X server process.

The vulnerabilities are reported in X.org X11 version R7.3. Other
versions may also be affected.

SOLUTION:
Apply vendor patches.

ftp://ftp.freedesktop.org/pub/xorg/X11R7.3/patches/xorg-xserver-1.4-cve-2008-1377.diff

MD5: 7462bea57623ad7ccdcad334ff5592b3 
xorg-xserver-1.4-cve-2008-1377.diff
SHA1: 2b75985081665b8d646b5810d411047c6c150576 
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

MD5: edb93f202b70eea8f6cb6be39b126e56 
xorg-xserver-1.4-cve-2008-1379.diff
SHA1: 1ca8b8417d805e0c233bda4b980cb168ec444abd 
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
MD5: 7e45c657e587ddb85b36b0ac155ae20c 
xorg-xserver-1.4-cve-2008-2360.diff
SHA1: 2e8532fe737e702cb18160705cd75daed4141a4c 
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

MD5: 0841c68a30d458918bd11747cf28bae6 
xorg-xserver-1.4-cve-2008-2361.diff
SHA1: 950af2461d0bc5ff5b2b3cc40d517344a77e19f9 
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

MD5: 7c86b4b6927f1ed6e0f58c04ed984ea5 
xorg-xserver-1.4-cve-2008-2362.diff
SHA1: e773f720057785062958d0fa9f29a4cb441883c8 
xorg-xserver-1.4-cve-2008-2362.diff

PROVIDED AND/OR DISCOVERED BY:
regenrecht, reported via iDefense.

ORIGINAL ADVISORY:
X.org:
http://lists.freedesktop.org/archives/xorg/2008-June/036026.html

iDefense:
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

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