Mozilla Firefox JSON.stringify Dangling Pointer Remote Code Execution Vulnerability

March 2nd, 2011
ZDI-11-103 ZDI-CAN-971

CVE ID

CVE-2011-0055

CVSS Score

9.0 AV:N/AC:L/Au:N/C:P/I:P/A:C

Affected Vendors

Mozilla

Affected Products

Firefox

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Firefox. 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 js3250.dll. In the JSON.stringify() call chain js_HasOwnProperty() is called with an invalid pointer. The pointer becomes invalid due to being unrooted and garbage collection occurring. Dereferecing of this pointer allows a remote attacker to execute arbitrary code in the context of the user running the browser.

Additional Details

Mozilla has issued an update to correct this vulnerability. More details can be found at:
http://www.mozilla.org/security/announce/2011/mfsa2011-03.html

Disclosure Timeline

  • 2010-12-01 - Vulnerability reported to vendor
  • 2011-03-02 - Coordinated public release of advisory

Credit

regenrecht

Back to Advisories