Advisory Details

December 21st, 2012

Webkit HTMLMedia Element beforeLoad Remote Code Execution Vulnerability

ZDI-12-191
ZDI-CAN-1528

CVE ID CVE-2011-3071
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS WebKit.Org
AFFECTED PRODUCTS WebKit
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 12492. 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 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 HTMLMedia element. After a source element is created, an attacker can catch the beforeLoad event before the element is used, and delete the element. The pointer to the source element will then be referenced causing a use-after-free condition, which can lead to code execution under the context of the application.

ADDITIONAL DETAILS WebKit.Org has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT1222
DISCLOSURE TIMELINE
  • 2012-03-14 - Vulnerability reported to vendor
  • 2012-12-21 - Coordinated public release of advisory
CREDIT pa_kt / twitter.com/pa_kt
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