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Zero Day Initiative Advisory 08-068

Zero Day Initiative Advisory 08-068
Posted Oct 15, 2008
Authored by Tipping Point, wushi, ling | Site zerodayinitiative.com

A vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office Excel. Exploitation requires that the victim to open the malformed BIFF (.xls) document. The specific flaw exists within the parsing of the BIFF file format used by Microsoft Excel. During the processing of a malformed record, user-supplied data is copied into a stack-based buffer using a size that is calculated using contents from the record.

tags | advisory, remote, arbitrary
advisories | CVE-2008-3471
SHA-256 | 7113a32f28e1f4666388b1b7ce49b8355c7c7da30583bc448fdd2531f9318f3a

Zero Day Initiative Advisory 08-068

Change Mirror Download
ZDI-08-068: Microsoft Office Excel BIFF File Format Parsing Stack Overflow 
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-08-068

-- CVE ID:
CVE-2008-3471

-- Affected Vendors:
Microsoft

-- Affected Products:
Microsoft Office Excel

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 6465.
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 Excel. Exploitation
requires that the victim to open the malformed BIFF (.xls) document.

The specific flaw exists within the parsing of the BIFF file format used
by Microsoft Excel. During the processing of a malformed record,
user-supplied data is copied into a stack-based buffer using a size that
is calculated using contents from the record.

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

http://www.microsoft.com/technet/security/bulletin/MS08-057.mspx

-- Disclosure Timeline:
2008-05-23 - Vulnerability reported to vendor

-- Credit:
This vulnerability was discovered by:
* wushi & ling of team509

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/

CONFIDENTIALITY NOTICE: This e-mail message, including any attachments,
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