US-CERT Technical Cyber Security Alert TA05-012A -- Multiple Vulnerabilities in Microsoft Windows Icon and Cursor Processing

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             Technical Cyber Security Alert TA05-012A

Multiple Vulnerabilities in Microsoft Windows Icon and Cursor Processing

Original release date: January 12, 2005
Last revised: –
Source: US-CERT

Systems Affected

Microsoft Windows Operating Systems excluding Microsoft Windows XP SP2

Overview

Microsoft Windows contains multiple vulnerabilities in the way that it
handles cursor and icon files. A remote attacker could execute
arbitrary code or cause a denial-of-service condition.

I. Description

Microsoft Security Bulletin MS05-002 describes a number of
vulnerabilities in the way that Windows handles icons, cursors,
animated cursors, and bitmaps. Further details are available in the
following vulnerability notes:

VU#625856 - Microsoft Windows LoadImage API vulnerable to integer
overflow

The Microsoft Windows LoadImage routine is vulnerable to an integer
overflow that may allow a remote attacker to execute arbitrary code on
a vulnerable system.
(CAN-2004-1049)

VU#697136 - Microsoft Windows kernel vulnerable to denial-of-service
condition via animated cursor (.ani) rate number

A vulnerability exists in the way the Microsoft Windows kernel
processes animated cursor (.ani) files with a rate number set to zero.
Exploitation of this vulnerability may allow a remote attacker to
cause a denial-of-service condition.
(CAN-2004-1305)

VU#177584 - Microsoft Windows kernel vulnerable to denial-of-service
condition via animated cursor (.ani) frame number

A vulnerability exists in the way the Microsoft Windows kernel
processes animated cursor (.ani) files with a frame number set to
zero. Exploitation of this vulnerability may allow a remote attacker
to cause a denial-of-service condition.
(CAN-2004-1305)

Note that exploits for these vulnerabilities are publicly available.

II. Impact

If a remote attacker can persuade a user to access a specially crafted
bitmap image, icon, or cursor file, the attacker may be able to
execute arbitrary code on that user's system, with their privileges.
Potentially, any operation that displays an image could trigger
exploitation; for instance, browsing the file system, reading HTML
email, or browsing websites.

III. Solution

Install an Update

Install the update as described in Microsoft Security Bulletin
MS05-002. Please also note that this update is also available via
Windows Update and Automatic Updates.

Appendix A. References

 * US-CERT Vulnerability Note VU#697136 -
   <http://www.kb.cert.org/vuls/id/697136>
 * US-CERT Vulnerability Note VU#177584 -
   <http://www.kb.cert.org/vuls/id/177584>
 * US-CERT Vulnerability Note VU#625856 -
   <http://www.kb.cert.org/vuls/id/625856>
 * Microsoft Security Bulletin MS05-002 -
   <http://www.microsoft.com/technet/security/bulletin/ms05-002.mspx>
 _________________________________________________________________

These vulnerabilities were reported by Flashsky Fangxing and eEye
Digital Security.
_________________________________________________________________

Feedback can be directed to the author: Jeffrey Gennari
_________________________________________________________________

This document is available from:

 <http://www.us-cert.gov/cas/techalerts/TA05-012A.html>

 _________________________________________________________________

Copyright 2005 Carnegie Mellon University. Terms of use

Revision History

Jan 12, 2005: Initial release

                   Last updated January 12, 2005 

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