ZDI-10-093: Apple Webkit CSS Charset Text Transformation Remote Code Execution Vulnerability

ZDI-10-093: Apple Webkit CSS Charset Text Transformation Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-093
June 8, 2010

– CVE ID:
CVE-2010-1770

– Affected Vendors:
Apple

– Affected Products:
Apple WebKit

– TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 9858.
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http://www.tippingpoint.com

– Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Apple Safari's Webkit. User interaction is
required to exploit this vulnerability in that the target must visit a
malicious page or open a malicious file.

The specific flaw exists within Webkit's support of character sets. If
the IBM1147 character set is applied to a particular element and that
element has a text transformation applied to it, the application will
attempt to access an object that doesn't exist in order to perform the
transformation. Successful exploitation will lead to code execution
under the context of the web-browser.

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

http://support.apple.com/kb/HT4196

– Disclosure Timeline:
2010-05-03 - Vulnerability reported to vendor
2010-06-08 - Coordinated public release of advisory

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

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