Microsoft Windows TrueType font array indexing vulnerability

Overview

A vulnerability in the Microsoft Windows TrueType font parsing component could allow an attacker to cause a denial-of-service condition in Microsoft Windows.

Description

The Microsoft Windows kernel includes a driver (win32k.sys) that handles a variety of graphics processing tasks, including the processing of TrueType fonts. A vulnerability exists in the way this driver validates array indexes. This can cause Windows to crash with a “blue screen.”

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Impact

By convincing a user to open a specially-crafted TrueType font file, a remote, unauthenticated attacker could cause a denial-of-service condition.

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Solution

Apply an update

This issue is addressed in Microsoft Security Bulletin MS11-084.

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Vendor Information

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Microsoft Corporation Affected

Notified: June 13, 2011 Updated: November 08, 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/ms11-084&gt;

CVSS Metrics

Group	Score	Vector
Base	7.1	AV:N/AC:M/Au:N/C:N/I:N/A:C
Temporal	6.2	E:ND/RL:OF/RC:C
Environmental	6.2	CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND

References

<http://technet.microsoft.com/en-us/security/bulletin/ms11-084&gt;

Acknowledgements

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

This document was written by Will Dormann.

Other Information

CVE IDs:	CVE-2011-2004
Severity Metric:	2.92 Date Public: