Advisory Details

July 27th, 2011

Apple Safari Webkit FrameOwner Element Remote Code Execution Vulnerability

ZDI-11-239
ZDI-CAN-1047

CVE ID CVE-2011-0233
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS WebKit
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari 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 library's implementation of a FrameOwner element. When building this tree, the application will create a duplicate reference of an element. By freeing the referenced element, a use-after-free condition can be made to occur 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
  • 2011-01-21 - Vulnerability reported to vendor
  • 2011-07-27 - Coordinated public release of advisory
CREDIT wushi of team509
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