TippingPoint Zero Day Initiative

Apple WebKit CSS run-in Attribute Rendering Remote Code Execution Vulnerability

ZDI-10-030: March 16th, 2010


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 9597. For further product information on the TippingPoint IPS:

Vulnerability Details

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

Vendor Response

Google states:

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

Disclosure Timeline

    2009-10-21 - Vulnerability reported to vendor
    2010-03-16 - Coordinated public release of advisory


This vulnerability was discovered by:
    wushi of team509