[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@netti.fi>
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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