TITLE:
Windows Registry Key Locking Denial of Service

SECUNIA ADVISORY ID:
SA14061

VERIFY ADVISORY:
http://secunia.com/advisories/14061/

CRITICAL:
Not critical

IMPACT:
DoS

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 NT 4.0 Server
http://secunia.com/product/18/
Microsoft Windows NT 4.0 Server, Terminal Server Edition
http://secunia.com/product/19/
Microsoft Windows NT 4.0 Workstation
http://secunia.com/product/15/
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/
Microsoft Windows XP Home Edition
http://secunia.com/product/16/
Microsoft Windows XP Professional
http://secunia.com/product/22/

DESCRIPTION:
Vladimir Kraljevic has reported a security issue in Windows, which
can be exploited by malicious, local users to cause a DoS (Denial of
Service).

The problem is that only a certain number of handles can be opened on
a registry key. This can be exploited to prevent other users from
logging on both locally and remotely via terminal services by opening
a large amount of handles on the "HKLM\SOFTWARE\Microsoft\Windows
NT\CurrentVersion" registry key and not closing them again.

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Vladimir Kraljevic

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