US-CERT Technical Cyber Security Alert TA07-093A -- Microsoft Update for Windows Animated Cursor Vulnerability

04/04/07, US-CERT Technical Cyber Security Alert TA07-093A -- Microsoft Update for Windows Animated Cursor Vulnerability
From: CERT Advisory <cert-advisory@cert.org>

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To: cert-advisory@cert.org
Subject: US-CERT Technical Cyber Security Alert TA07-093A -- Microsoft Update for Windows Animated Cursor Vulnerability
From: CERT Advisory <cert-advisory@cert.org>
Date: Tue, 3 Apr 2007 15:49:03 -0400
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                        National Cyber Alert System

                  Technical Cyber Security Alert TA07-093A



Microsoft Update for Windows Animated Cursor Vulnerability

   Original release date: April 3, 2007
   Last revised: --
   Source: US-CERT


Systems Affected

   Microsoft Windows 2000, XP, Server 2003, and Vista are affected.
   Applications that provide attack vectors include

     * Microsoft Internet Explorer
     * Microsoft Outlook
     * Microsoft Outlook Express
     * Microsoft Windows Mail
     * Microsoft Windows Explorer


Overview

   Microsoft has released updates to address vulnerabilities in the way
   that Microsoft Windows handles image files. A fix for the animated
   cursor buffer overflow vulnerability (VU#191609) is included in these
   updates.


I. Description

   Microsoft has released Security Bulletin MS07-017 to correct
   vulnerabilities in the way that Microsoft Windows handles image files.
   This update includes a fix for the animated cursor ANI header stack
   buffer overflow vulnerability (VU#191609).

   More information about the animated cursor buffer overflow
   vulnerability is available in Vulnerability Note VU#191609 and in
   Technical Cyber Security Alert TA07-089A. Refer to Microsoft Security
   Bulletin MS07-017 for more information on the other vulnerabilities.


II. Impact

   Applying these updates will mitigate the vulnerability described in
   Technical Cyber Security Alert TA07-089. The impact of exploiting that
   vulnerability is that a remote, unauthenticated attacker could execute
   arbitrary code or cause a denial-of-service condition.


III. Solution

Install updates from Microsoft

   Microsoft has released updates for this and other image processing
   vulnerabilities in Microsoft Security Bulletin MS07-017.

   Note that this is only part of the Microsoft security update release
   for April 2007. According to Microsoft:

     Microsoft will update this bulletin summary with any other security
     bulletins that release on April 10 or on any other day of the
     month, as deemed appropriate. 

   Refer to Technical Cyber Security Alert TA07-089A and Vulnerability
   Note VU#191609 for information about workarounds that may reduce the
   chances of exploitation until updates can be applied.

   System administrators may wish to consider using an automated patch
   distribution system such as Windows Server Update Services (WSUS).


IV. References

     * US-CERT Technical Cyber Security Alert TA07-089A -
       <http://www.us-c ert.gov/cas/techalerts/TA07-089A.html>

     * Vulnerability Note VU#191609 -
       <http://www.kb.cert.org/vuls/id/191609>

     * Microsoft Security Bulletin MS07-017 -
       <http://www.microsoft.com/technet/security/bulletin/ms07-017.mspx>

     * Microsoft Security Advisory (935423) -
       <http://www.microsoft.com/technet/security/advisory/935423.mspx>

     * Microsoft Security Bulletin Summary for April 2007 -
       <http://www.microsoft.com/technet/security/bulletin/ms07-apr.mspx>

     * Microsoft Security Response Center Blog -
       <http://blogs.technet.com/msrc/search.aspx?q=935423>

     * Windows Server Updates Services -
       <http://www.microsoft.com/windowsserversystem/updateservices/default.mspx>

 ____________________________________________________________________

   The most recent version of this document can be found at:

     <http://www.us-cert.gov/cas/techalerts/TA07-093A.html>
 ____________________________________________________________________

   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA07-093A Feedback VU#191609" in the
   subject.
 ____________________________________________________________________

   For instructions on subscribing to or unsubscribing from this
   mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
 ____________________________________________________________________

   Produced 2007 by US-CERT, a government organization.

   Terms of use:

     <http://www.us-cert.gov/legal.html>
 ____________________________________________________________________

   Revision History

   April 3, 2007: Initial release

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