Windows font library file buffer overflow

Overview

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.

Description

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.

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Impact

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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Solution

Apply an update

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

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Vendor Information

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Microsoft Corporation Affected

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

Status

Affected

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

• <http://technet.microsoft.com/en-us/security/bulletin/ms11-077&gt;

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

References

• <http://technet.microsoft.com/en-us/security/bulletin/ms11-077&gt;
• <http://exploitshop.wordpress.com/2011/10/12/ms11-077-vulnerabilities-in-windows-kernel-mode-drivers-could-allow-remote-code-execution-2567053/&gt;

Acknowledgements

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: