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ZDI-09-073: Adobe Reader Compact Font Format Malformed Index Memory Corruption Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Tue, 13 Oct 2009 15:02:16 -0500

ZDI-09-073: Adobe Reader Compact Font Format Malformed Index Memory Corruption Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-09-073
October 13, 2009

-- CVE ID:
CVE-2009-2985

-- Affected Vendors:
Adobe

-- Affected Products:
Adobe Acrobat
Adobe Reader

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 8658. 
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 Adobe Acrobat and Adobe Reader. User
interaction is required to exploit this vulnerability in that the target
must visit a malicious page or open a malicious file.

The specific flaw exists when the application parses a PDF file
containing a malformed Compact Font Format stream. While decoding the
font embedded in this stream, the application will explicitly trust a
16-bit value used to index into an array of elements. Usage of the
object later will cause heap corruption which can be leveraged to
achieve code execution under the context of the current user.

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

http://www.adobe.com/support/security/bulletins/apsb09-15.html

-- Disclosure Timeline:
2009-04-28 - Vulnerability reported to vendor
2009-10-13 - 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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