Advisory Details

August 17th, 2011

Mozilla Firefox SVGTextElement.getCharNumAtPosition Remote Code Execution Vulnerability

ZDI-11-270
ZDI-CAN-1143

CVE ID CVE-2011-0084
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Mozilla
AFFECTED PRODUCTS Firefox
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11213. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
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 text containers. The code within nsSVGGlyphFrame::GetCharNumAtPosition() does not account for user defined getter methods modifying or destroying the parent object. 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/mfsa2011-30.html#cve-2011-0084
DISCLOSURE TIMELINE
  • 2011-04-04 - Vulnerability reported to vendor
  • 2011-08-17 - Coordinated public release of advisory
CREDIT regenrecht
BACK TO ADVISORIES