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Zero Day Initiative Advisory 11-297

Zero Day Initiative Advisory 11-297
Posted Oct 26, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-297 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of 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 within the Adobe Image parsing library. When Adobe Reader tries to parse an .PCX image it creates a 32 bits loop counter based on the height and width of the image. It then enters a loop to copy data from the file in to a memory buffer, but the loop counter used in that function is only a 16 bit integer and as such can never reach the end of the loop when the max loop counter is bigger then 0xFFFF. Exploitation of this issue allows for remote code execution under the context of the user running the application.

tags | advisory, remote, arbitrary, code execution
advisories | CVE-2011-2437
MD5 | c682f5d41b32ce8bbdd45ad20ea5a980

Zero Day Initiative Advisory 11-297

Change Mirror Download
ZDI-11-297 : Adobe Reader U3D PCX Parsing Remote Code Execution
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-297
October 26, 2011

-- CVE ID:
CVE-2011-2437

-- CVSS:
7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

-- Affected Vendors:

Adobe



-- Affected Products:

Adobe Reader



-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of 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 within the Adobe Image parsing library. When
Adobe Reader tries to parse an .PCX image it creates a 32 bits loop
counter based on the height and width of the image. It then enters a
loop to copy data from the file in to a memory buffer, but the loop
counter used in that function is only a 16 bit integer and as such can
never reach the end of the loop when the max loop counter is bigger then
0xFFFF. Exploitation of this issue allows for remote code execution
under the context of the user running the application.

-- Vendor Response:

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

http://www.adobe.com/support/security/bulletins/apsb11-24.html



-- Disclosure Timeline:
2011-05-12 - Vulnerability reported to vendor
2011-10-26 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:

* binaryproof



-- 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/

Follow the ZDI on Twitter:

http://twitter.com/thezdi

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