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TITLE:
Microsoft Windows CSRSS Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA23448

VERIFY ADVISORY:
http://secunia.com/advisories/23448/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

OPERATING SYSTEM:
Microsoft Windows 2000 Advanced Server
http://secunia.com/product/21/
Microsoft Windows 2000 Datacenter Server
http://secunia.com/product/1177/
Microsoft Windows 2000 Professional
http://secunia.com/product/1/
Microsoft Windows 2000 Server
http://secunia.com/product/20/
Microsoft Windows Server 2003 Datacenter Edition
http://secunia.com/product/1175/
Microsoft Windows Server 2003 Standard Edition
http://secunia.com/product/1173/
Microsoft Windows Server 2003 Enterprise Edition
http://secunia.com/product/1174/
Microsoft Windows Server 2003 Web Edition
http://secunia.com/product/1176/
Microsoft Windows XP Home Edition
http://secunia.com/product/16/
Microsoft Windows XP Professional
http://secunia.com/product/22/

DESCRIPTION:
A vulnerability has been reported in Microsoft Windows, which can be
exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to a double-free error in the
handling of HardError messages within WINSRV.DLL. This may be
exploited to execute arbitrary code under the CSRSS process with
SYSTEM privileges by setting the caption or text parameters of the
"MessageBox()" function to a string that starts with "\??\".

The vulnerability is reported in Windows 2000 SP4, Windows Server
2003 SP1, Windows XP SP1, Windows XP SP2, and Windows Vista.

SOLUTION:
Grant access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Independently discovered by:
* NULL
* Tim Garnett, Determina Security Research.

ORIGINAL ADVISORY:
Microsoft:
http://blogs.technet.com/msrc/archive/2006/12/22/new-report-of-a-windows-vulnerability.aspx

Full-Disclosure:
http://lists.grok.org.uk/pipermail/full-disclosure/2006-December/051394.html

Determina Security Research:
http://www.determina.com/security.research/vulnerabilities/csrss-harderror.html

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About:
This Advisory was delivered by Secunia as a free service to help
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vulnerabilities.

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http://secunia.com/about_secunia_advisories/


Please Note:
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