[Full-disclosure] ZDI-09-032: Apple WebKit attr() Invalid Attribute Memory Corruption Vulnerability

[ZDI Disclosures <zdi-disclosures@xxxxxxxxxxxxxxxx>]

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

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