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Insecure Library Loading
Moderately critical

Windows RPC DCOM Interface Buffer Overflow Vulnerability

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Description


A vulnerability has been identified in Microsoft Windows, which can be exploited by malicious people to compromise a vulnerable system.

The cause of the vulnerability is twofold. The RPC service performs inadequate input validation before passing data to a DCOM (Distributed Component Object Model) interface. This interface has a boundary error in the "CoGetInstanceFromFile" API when handling the "szName" parameter, which can be exploited by sending a RPC packet containing an overly long, specially crafted filename.

Successful exploitation may cause a buffer overflow allowing execution of arbitrary code on the vulnerable system with "LocalSystem" privileges.

It has been reported that this vulnerability may be exploited through the following ports:
135/udp, 135/tcp, 139/tcp, 445/tcp, 593/tcp

Depending on your configuration, other RPC enabled ports could possibly open attack vectors too.


Solution:
Apply patch via WindowsUpdate or manually (NOTE: Reportedly, the patch for Windows 2000 doesn't fix the vulnerability adequately).

Further details available to Secunia VIM customers

Provided and/or discovered by:
The Last Stage of Delirium Research Group

Original Advisory:
http://www.microsoft.com/technet/security/bulletin/MS03-026.asp

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Windows RPC DCOM Interface Buffer Overflow Vulnerability

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