Advisory Details

March 2nd, 2011

Apple Webkit Font Glyph Layout Remote Code Execution Vulnerability

ZDI-11-099
ZDI-CAN-968

CVE ID CVE-2011-0133
CVSS SCORE 9.7, (AV:N/AC:L/Au:N/C:C/I:P/A:C)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS WebKit
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 10870. For further product information on the TippingPoint IPS: 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 the way the application handles floating blocks in certain situations. When performing layout operations for a floating block produced by a pseudo-element, the application will attempt to access glyph data that hasn't been fully assigned into the glyph data hashmap. Due to this type being incomplete, this can lead to code execution under the context of the application.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT4554
DISCLOSURE TIMELINE
  • 2010-10-18 - Vulnerability reported to vendor
  • 2011-03-02 - Coordinated public release of advisory
CREDIT wushi of team509
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