(Pwn2Own) WebKit WBR Tag Removal Remote Code Execution Vulnerability
Vulnerability Details
This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of 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 handles WBR tags on a webpage. By adding children to a WBR tag and then consequently removing the tag through, for example, a 'removeChild' call it is possible to create a dangling pointer that can result in remote code execution under the context of the current user.
Additional Details
Google patch on March 12, 2011:
http://googlechromereleases.blogspot.com/2011/03/stable-and-beta-channel-updates.html
Apple patch on April 14, 2011:
http://support.apple.com/kb/HT4606
http://support.apple.com/kb/HT4607
http://support.apple.com/kb/HT4596
Webkit fix:
http://trac.webkit.org/changeset/79689
Disclosure Timeline
- 2011-03-31 - Vulnerability reported to vendor
- 2011-04-14 - Coordinated public release of advisory
Credit
Vupen Security
