Message-ID: <OFD3F12529.8BE152AD-ON88257409.00745B05-86257409.0074E4BE@3com.com>
Date: Tue, 11 Mar 2008 16:16:48 -0500
From: zdi-disclosures@...m.com
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: ZDI-08-008: Microsoft Excel BIFF File Format Cell
 Record Parsing Memory Corruption Vulnerability

ZDI-08-008: Microsoft Excel BIFF File Format Cell Record Parsing Memory 
Corruption Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-08-008
March 11, 2008

-- CVE ID:
CVE-2008-0113

-- Affected Vendors:
Microsoft

-- Affected Products:
Microsoft Office Excel Viewer

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 5338. 
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. Exploitation requires that
the attacker coerce the target into opening a malicious .XLS file.

The specific flaw exists within the parsing of malformed cell comments.
When Excel encounters a malformed record it attempts to rebuild the
broken meta-data. A flaw in this rebuilding process allows the user to
specify critical data offsets eventually leading to code execution under
the logged in users credentials.


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

http://www.microsoft.com/technet/security/Bulletin/MS08-016.mspx

-- Disclosure Timeline:
2007-05-22 - Vulnerability reported to vendor
2008-03-11 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Arnaud Dovi - ad@...poverflow.com

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