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ZDI-10-030: Apple WebKit CSS run-in Attribute Rendering Remote Code Execution Vulnerability

ZDI-10-030: Apple WebKit CSS run-in Attribute Rendering Remote Code Execution Vulnerability
March 16, 2010

-- Affected Vendors:

-- Affected Products:
Apple WebKit
Apple Safari
Google Chrome

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 9597. 
For further product information on the TippingPoint IPS, visit:


-- 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:
Apple 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

-- Credit:
This vulnerability was discovered by:
    * wushi of team509

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