ZDI-11-340 : Apple Quicktime Font Table Signed Length Remote Code Execution Vulnerability

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ZDI-11-340 : Apple Quicktime Font Table Signed Length Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-340
December 7, 2011

• – CVE ID:
  CVE-2011-3248

• – CVSS:
  7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

• – Affected Vendors:

Apple

• – Affected Products:

Apple Quicktime

• – TippingPoint(TM) IPS Customer Protection:
  TippingPoint IPS customers have been protected against this
  vulnerability by Digital Vaccine protection filter ID 11876.
  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 Quicktime. 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 how the application parses font names
embedded within an atom. When parsing the font name, the application
will treat a length from the file as a signed value when copying font
data into a buffer. Due to an unsigned promotion, this can be used to
write outside the bounds of a buffer which can lead to code execution
under the context of the application.

• – Vendor Response:

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

http://support.apple.com/kb/HT5016

• – Disclosure Timeline:
  2011-07-20 - Vulnerability reported to vendor
  2011-12-07 - Coordinated public release of advisory

• – Credit:
  This vulnerability was discovered by:

• Luigi Auriemma

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