Advisory Details

July 27th, 2011

Apple Safari Rendering Object Body Detachment Remote Code Execution Vulnerability

ZDI-11-242
ZDI-CAN-1317

CVE ID CVE-2011-0255
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS Safari
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11510. 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 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 how the application frees references from a particular element. When freeing these references, the application will fail to remove the reference from the rendering object. Later upon trying to free the element again, the application will access the freed reference which 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/HT4808
DISCLOSURE TIMELINE
  • 2011-07-12 - Vulnerability reported to vendor
  • 2011-07-27 - Coordinated public release of advisory
CREDIT Anonymous
BACK TO ADVISORIES