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TITLE:
Microsoft Windows Kernel Mapped Memory Insecure Permissions

SECUNIA ADVISORY ID:
SA24834

VERIFY ADVISORY:
http://secunia.com/advisories/24834/

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 XP Home Edition
http://secunia.com/product/16/
Microsoft Windows XP Professional
http://secunia.com/product/22/
Microsoft Windows Server 2003 Datacenter Edition
http://secunia.com/product/1175/
Microsoft Windows Server 2003 Enterprise Edition
http://secunia.com/product/1174/
Microsoft Windows Server 2003 Standard Edition
http://secunia.com/product/1173/
Microsoft Windows Server 2003 Web Edition
http://secunia.com/product/1176/

DESCRIPTION:
eEye Digital Security has reported a vulnerability in Microsoft
Windows, which can be exploited by malicious, local users to gain
escalated privileges.

The vulnerability is caused due to a race condition in the kernel's
Virtual DOS Machine (VDM) implementation. This results in insecure
permissions on a mapped memory segment thereby allowing manipulation
of the contents.

Successful exploitation allows execution of arbitrary code with
escalated privileges.

NOTE: This security issue does not affected Windows for x64 and
Itanium-based systems.

SOLUTION:
Apply patches.

Windows 2000 (requires SP4):
http://www.microsoft.com/downloads/details.aspx?FamilyId=b3599afb-7673-4ef6-a2b1-d77e39fd782c

Windows XP (requires SP2):
http://www.microsoft.com/downloads/details.aspx?FamilyId=eeaee4a7-4858-4b6b-9c6d-a9f1eae19b51

Windows Server 2003 (optionally with SP1/SP2):
http://www.microsoft.com/downloads/details.aspx?FamilyId=5e94a29c-7ec0-4459-92eb-d43b524fd6fd

PROVIDED AND/OR DISCOVERED BY:
Derek Soeder, eEye Digital Security.

ORIGINAL ADVISORY:
MS07-022 (KB931784):
http://www.microsoft.com/technet/security/Bulletin/MS07-022.mspx

eEye Digital Security:
http://research.eeye.com/html/advisories/published/AD20070410a.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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