Mozilla Firefox SVGPointList.appendItem Remote Code Execution Vulnerability

June 21st, 2011
ZDI-11-224 ZDI-CAN-1144

CVE ID

CVE-2011-2363

CVSS Score

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

Affected Vendors

Mozilla

Affected Products

Firefox

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 or open a malicious file.

The specific flaw exists within the code responsible for parsing SVG polygon objects. The code within nsSVGPointList::AppendElement() does not account for user defined getter methods modifying or destroying the parent object during a repaint. An attacker can abuse this flaw to create a dangling pointer which is referenced during the traversal of the SVG container hierarchy. This can be leveraged to execute arbitrary code within the context of 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/mfsa2011-23.html

Disclosure Timeline

  • 2011-04-06 - Vulnerability reported to vendor
  • 2011-06-21 - Coordinated public release of advisory

Credit

regenrecht

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