Advisory Details

March 2nd, 2011

Apple Safari Webkit Runin Box Promotion Remote Code Execution Vulnerability

ZDI-11-098
ZDI-CAN-987

CVE ID CVE-2011-0132
CVSS SCORE 9, (AV:N/AC:L/Au:N/C:P/I:P/A:C)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS WebKit
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari's Webkit. 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 way the WebKit library implements the requirements required for a Runin box as outlined in the Visual Formatting Model listed in the CSS 2.1 Specification. When promoting a run-in element the application will incorrectly free one of the child elements of the run-in. Later, when attempting to do layout for this element, the application will access the freed element due to the dangling reference. This can lead to code execution under the context of the application.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT4554
DISCLOSURE TIMELINE
  • 2010-11-29 - Vulnerability reported to vendor
  • 2011-03-02 - Coordinated public release of advisory
CREDIT wushi of team509
Jose A. Vazquez of {http://spa-s3c.blogspot.com/}
BACK TO ADVISORIES