Advisory Details

October 26th, 2011

Adobe Reader U3D PCX Parsing Remote Code Execution Vulnerability

ZDI-11-297
ZDI-CAN-1202

CVE ID CVE-2011-2437
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Adobe
AFFECTED PRODUCTS 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.

ADDITIONAL DETAILS 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 binaryproof
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