TippingPoint Zero Day Initiative
 

Mozilla Firefox CSSValue Array Memory Corruption Vulnerability

ZDI-08-044: July 17th, 2008

CVE ID

Affected Vendors

Affected Products

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Mozilla Firefox. User interaction is required to exploit this vulnerability in that the target must visit a malicious page.

The specific flaw exists in the browser's handling reference counters to the nsCSSValue:Array class. Creating more then 65,535 references will overflow a 16-bit reference counter and therefore result in an erroneous free() while the object still exists. Properly manipulated this can result in arbitrary code execution under the context of the current user.

Vendor Response

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

Disclosure Timeline

    2008-06-17 - Vulnerability reported to vendor
    2008-07-17 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    Anonymous