[NT] Microsoft Windows XP RPC Cache Memory Leak Vulnerabiliry

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  Microsoft Windows XP RPC Cache Memory Leak Vulnerabiliry
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SUMMARY

When you run a program that uses the Windows Management Instrumentation 
(WMI) service in Microsoft Windows XP, the memory that is used by a remote 
procedure call (RPC) cache may not be freed, and a memory leak may occur. 
The RPC cache may grow so large that it causes the program and Windows XP 
to become unresponsive.

DETAILS

Vulnerable Systems:
 * Rpcrt4.dll library version 5.1.2600.2575 and prior

This problem may occur if many expired and unused security contexts are 
generated every second. (Security contexts are generated by the program 
that you are running.) The RPC cache is cleaned up at a rate of nine 
security context entries every 10 seconds. If the security contexts are 
generated at a faster rate than the cache is cleaned up, the cache grows 
larger and eventually causes the problem.

Vendor Status:
A supported hotfix is now available from Microsoft, but it is only 
intended to correct the problem that is described in this article. Only 
apply it to systems that are experiencing this specific problem. This 
hotfix may receive additional testing. Therefore, if you are not severely 
affected by this problem, we recommend that you wait for the next Windows 
XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support 
Services to obtain the hotfix. For a complete list of Microsoft Product 
Support Services phone numbers and information about support costs, visit 
the following Microsoft Web site:
 <http://support.microsoft.com/default.aspx?scid=fh;[LN];CNTACTMS> 
http://support.microsoft.com/default.aspx?scid=fh;[LN];CNTACTMS


ADDITIONAL INFORMATION

The information has been provided by  <mailto:juha-matti.laurio@xxxxxxxx> 
Juha-Matti Laurio .
The original article can be found at:  
<http://support.microsoft.com/kb/890196/EN-US/> 
http://support.microsoft.com/kb/890196/EN-US/



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