‘Apple WebKit CSS Run-in Attribute Rendering Vulnerability’


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari and other WebKit based browsers.’


‘The information has been provided by wushi of team509.
The original article can be found at: http://www.zerodayinitiative.com/advisories/ZDI-10-030


Vulnerable Systems:
 * Apple WebKit
 * Apple Safari
 * Google Chrome

User interaction is required to exploit this vulnerability in that the target must visit a malicious page.

The specific flaw exists in the handling of the run-in value for display CSS styles. A specially crafted web page can cause a use after free() condition in WebKit’s WebCore::RenderBlock() method. This can be further leveraged by attackers to execute arbitrary code under the context of the current user.

Patch Availability:
Apple has issued an update to correct this vulnerability. More details can be found at:

CVE Information:

Disclosure Timeline:
2009-10-21 – Vulnerability reported to vendor
2010-03-16 – Coordinated public release of advisory’

Categories: UNIX