Vulnerability Note VU#619281

Windows font library file buffer overflow

Original Release date: 11 Oct 2011 | Last revised: 28 Mar 2012


Microsoft Windows contains a buffer overflow vulnerability in the handling of font library files, which may allow a remote, unauthenticated attacker to execute arbitrary code with kernel privileges.


Microsoft Windows supports a variety of font formats. One of which is the font library file format, which have the file extension of .FON. Rendering of font library files takes place in the Windows GDI (Graphics Device Interface), which is part of the Windows kernel-mode driver win32k.sys. Microsoft Windows contains a buffer overflow in the handling of font library files.


By convincing a user to open a specially-crafted font library file, a remote, unauthenticated attacker could execute arbitrary code with kernel privileges. A local use could also gain elevated privileges.


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This issue is addressed in Microsoft Security Bulletin MS11-077.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
Microsoft CorporationAffected10 Jun 201111 Oct 2011
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base 9.0 AV:N/AC:M/Au:N/C:C/I:C/A:P
Temporal 7.0 E:POC/RL:OF/RC:C
Environmental 7.0 CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND



This issue was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

Other Information

  • CVE IDs: CVE-2011-2003
  • US-CERT Alert: TA11-284A
  • Date Public: 11 Oct 2011
  • Date First Published: 11 Oct 2011
  • Date Last Updated: 28 Mar 2012
  • Severity Metric: 9.49
  • Document Revision: 15


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