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Zero Day Initiative Advisory 10-030

Zero Day Initiative Advisory 10-030
Posted Mar 16, 2010
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 10-030 - 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.

tags | advisory, remote, web, arbitrary
systems | apple
SHA-256 | 68798d11271c59d7e7bfaf837933f005ae3ce6bf51e24d41c6fa3dd2c11cb90b

Zero Day Initiative Advisory 10-030

Change Mirror Download
ZDI-10-030: Apple WebKit CSS run-in Attribute Rendering Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-030
March 16, 2010

-- Affected Vendors:
Apple
Google

-- 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:

http://www.tippingpoint.com

-- 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:

http://support.apple.com/kb/HT4070

-- 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

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

http://twitter.com/thezdi
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