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CERT Coordination Center

Windows font library file buffer overflow

Vulnerability Note VU#619281

Original Release Date: 2011-10-11 | Last Revised: 2012-03-28


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.


Apply an update

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

Vendor Information


Microsoft Corporation Affected

Notified:  June 10, 2011 Updated: October 11, 2011



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

CVSS Metrics

Group Score Vector
Base 9 AV:N/AC:M/Au:N/C:C/I:C/A:P
Temporal 7 E:POC/RL:OF/RC:C
Environmental 7 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
Severity Metric: 9.49
Date Public: 2011-10-11
Date First Published: 2011-10-11
Date Last Updated: 2012-03-28 15:06 UTC
Document Revision: 16

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