Message-ID: <EE499D69B3D0714590B6FE9762B0461104BD3C3AF8@emb01.unity.local>
Date: Wed, 11 Aug 2010 10:03:37 -0500
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: ZDI-10-150: Microsoft Office Word sprmCMajority
 Record Parsing Remote Code Execution Vulnerability

ZDI-10-150: Microsoft Office Word sprmCMajority Record Parsing Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-150
August 11, 2010

-- CVE ID:
CVE-2010-1900

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:
Microsoft

-- Affected Products:
Microsoft Office Word

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10122. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Microsoft Office Word. User interaction is
required to exploit this vulnerability in that the target must open a
malicious document.

The specific flaw exists in the parsing of sprmCMajority records in a
Word document. Due to the lack of parameter checking when processing
sprmCMajority sprm groups it is possible to arbitrarily control the
amount of data being written to a stack based buffer resulting in a
stack overflow vulnerability which can overwrite critical exception
structures. Successful exploitation can lead to remote code execution
under the credentials of the currently logged in user.

-- Vendor Response:
Microsoft has issued an update to correct this vulnerability. More
details can be found at:

http://www.microsoft.com/technet/security/bulletin/ms10-056.mspx

-- Disclosure Timeline:
2009-07-14 - Vulnerability reported to vendor
2010-08-11 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * L.W.Z of team509

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