full-disclosure - ZDI-09-083: Microsoft Excel Shared Feature Header Pointer Offset Memory Corruption Vulnerability

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Message-ID: <EE499D69B3D0714590B6FE9762B046110381100D49@emb01.unity.local>
Date: Tue, 10 Nov 2009 14:16:30 -0600
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-09-083: Microsoft Excel Shared Feature Header
 Pointer Offset Memory Corruption Vulnerability

ZDI-09-083: Microsoft Excel Shared Feature Header Pointer Offset Memory Corruption Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-09-083
November 10, 2009

-- CVE ID:
CVE-2009-3129

-- 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 9231. 
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. User interaction is
required to exploit this vulnerability in that the target must open a
malicious spreadsheet.

The specific flaw exists in the handling of Shared Feature Header
(0x867) tags in an Excel BIFF file format. When processing the cbHdrData
size element of the FEATHEADER it is possible to directly control the
distance of a calculated pointer. This condition can be leveraged
successfully to execute arbitrary code under the context 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/MS09-067.mspx

-- Disclosure Timeline:
2009-10-20 - Vulnerability reported to vendor
2009-11-10 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Anonymous

-- 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/
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