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ZDI-09-032: Apple WebKit attr() Invalid Attribute Memory Corruption Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Mon, 8 Jun 2009 17:54:09 -0500

ZDI-09-032: Apple WebKit attr() Invalid Attribute Memory Corruption
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-09-032
June 8, 2009

-- CVE ID:
CVE-2009-1698

-- Affected Vendors:
Apple

-- Affected Products:
Apple Safari

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 8043.
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 WebKit. 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 attr() functions in a CSS
content object. When a large numerical value is passed as the argument
to the attr() function, a memory corruption will occur which can be
leveraged to execute arbitrary coder under the context of the current
user.

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

http://support.apple.com/kb/HT3613

-- Disclosure Timeline:
2009-03-26 - Vulnerability reported to vendor
2009-06-08 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Thierry Zoller

-- 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/


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