BugTraq
Microsoft MSDTC NdrAllocate Validation Vulnerability May 11 2006 12:00AM
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McAfee, Inc.

McAfee Avert? Labs Security Advisory

Public Release Date: 2006-05-09

Microsoft MSDTC NdrAllocate Validation Vulnerability

CVE-2006-0034

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? Synopsis

There is an RPC procedure within the MSDTC interface in msdtcprx.dll

that may be called remotely without user credentials in such a way that

triggers a denial-of-service in the Distributed Transaction Coordinator

(MSDTC) service.

Exploitation can at most lead to a denial of service and therefore the

risk factor is at medium.

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? Vulnerable Systems

Microsoft Windows 2000

Microsoft Windows XP

Microsoft Windows Server 2003

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? Vulnerability Information

The msdtcprx.dll shared library contains RPC procedures for use with

the Distributed Transaction Coordinator (MSDTC) service utilized in

Microsoft Windows.

By sending a large (greater than 4k) request to BuildContextW(), a

size check can be bypassed and a bug in NdrAllocate() may be reached.

This vulnerability was reported to Microsoft on October 12, 2005

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? Resolution

Microsoft has provided a patch for this issue. Please see their

bulletin, KB913580, for more information on obtaining and installing

the patch.

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? Credits

This vulnerability was discovered by Chen Xiaobo of McAfee Avert Labs.

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? Legal Notice

Copyright (C) 2006 McAfee, Inc.

The information contained within this advisory is provided for the

convenience of McAfee?s customers, and may be redistributed provided

that no fee is charged for distribution and that the advisory is not

modified in any way. McAfee makes no representations or warranties

regarding the accuracy of the information referenced in this document,

or the suitability of that information for your purposes.

McAfee, Inc. and McAfee Avert Labs are registered Trademarks of McAfee,

Inc. and/or its affiliated companies in the United States and/or other

Countries. All other registered and unregistered trademarks in this

document are the sole property of their respective owners.

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