US-CERT Technical Cyber Security Alert TA04-212A -- Critical Vulnerabilities in Microsoft Windows

31/07/04, US-CERT Technical Cyber Security Alert TA04-212A -- Critical Vulnerabilities in Microsoft Windows
From: CERT Advisory <cert-advisory@cert.org>

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To: cert-advisory@cert.org
Subject: US-CERT Technical Cyber Security Alert TA04-212A -- Critical Vulnerabilities in Microsoft Windows
From: CERT Advisory <cert-advisory@cert.org>
Date: Fri, 30 Jul 2004 20:41:02 -0400
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Critical Vulnerabilities in Microsoft Windows

   Original release date: July 30, 2004
   Last revised: --
   Source: US-CERT

Systems Affected

   These vulnerabilities affect the following versions of Microsoft
   Internet Explorer:
     * Microsoft Internet Explorer 5.01 Service Pack 2
     * Microsoft Internet Explorer 5.01 Service Pack 3
     * Microsoft Internet Explorer 5.01 Service Pack 4
     * Microsoft Internet Explorer 5.5 Service Pack 2
     * Microsoft Internet Explorer 6
     * Microsoft Internet Explorer 6 Service Pack 1
     * Microsoft Internet Explorer 6 Service Pack 1 (64-Bit Edition)
     * Microsoft Internet Explorer 6 for Windows Server 2003
     * Microsoft Internet Explorer 6 for Windows Server 2003 (64-Bit
       Edition)

   These vulnerabilities affect the following versions of the Microsoft
   Windows operating system:
     * Microsoft Windows NT Workstation 4.0 Service Pack 6a
     * Microsoft Windows NT Server 4.0 Service Pack 6a
     * Microsoft Windows NT Server 4.0 Terminal Server Edition Service
       Pack 6
     * Microsoft Windows 2000 Service Pack 2, Microsoft Windows 2000
       Service Pack 3, Microsoft Windows 2000 Service Pack 4
     * Microsoft Windows XP and Microsoft Windows XP Service Pack 1
     * Microsoft Windows XP 64-Bit Edition Service Pack 1
     * Microsoft Windows XP 64-Bit Edition Version 2003
     * Microsoft Windows Server 2003
     * Microsoft Windows Server 2003 64-Bit Edition
     * Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE),
       and Microsoft Windows Millennium Edition (Me)

   Please note that these vulnerabilities my affect any software that
   uses the Microsoft Windows operating system to render HTML or
   graphics.

Overview

   Microsoft Internet Explorer contains three vulnerabilities that may
   allow arbitrary code to be executed. The privileges gained by a remote
   attacker depend on the software component being attacked. For example,
   a user browsing to an unsafe web page using Internet Explorer could
   have code executed with the same privilege as the user. These
   vulnerabilities have been reported to be relatively straightforward to
   exploit; even vigilant users visiting a malicious website, viewing a
   malformed image, or reading an HTML-rendered email message may be
   affected.

I. Description

   Microsoft Security Bulletin MS04-025 describes three vulnerabilities
   in Internet Explorer; more detailed information is available in the
   individual vulnerability notes. Note that in addition to Internet
   Explorer, any applications that use the Internet Explorer HTML
   rendering engine to interpret HTML documents may present additional
   attack vectors for these vulnerabilities.

   VU#266926 - Microsoft Internet Explorer contains an integer overflow
   in the processing of bitmap files

   An integer overflow vulnerability has been discovered in the way that
   Internet Explorer processes bitmap image files. This vulnerability
   could allow a remote attacker to execute arbitrary code on a
   vulnerable system by introducing a specially crafted bitmap file.
   (Other resources: CAN-2004-0566)

   VU#685364 - Microsoft Internet Explorer contains a double-free
   vulnerability in the processing of GIF files

   A double-free vulnerability has been discovered in the way that
   Internet Explorer processes GIF image files. When processing GIF image
   files, the routine responsible for freeing memory may attempt to free
   the same memory reference more than once. Deallocating the already
   freed memory can lead to memory corruption, which could cause a
   denial-of-service condition or potentially be leveraged by an attacker
   to execute arbitrary code.
   (Other resources: CAN-2003-1048)

   VU#713878 - Microsoft Internet Explorer does not properly validate
   source of redirected frame Microsoft Internet Explorer does not
   properly display URLs

   As previously discussed in TA-163A, Microsoft Internet Explorer does
   not adequately validate the security context of a frame that has been
   redirected by a web server. An attacker could exploit this
   vulnerability to evaluate script in different security domains. By
   causing script to be evaluated in the Local Machine Zone, the attacker
   could execute arbitrary code with the privileges of the user running
   Internet Explorer. For a detailed technical analysis of this
   vulnerability, please see VU#713878.
   (Other resources: CAN-2004-0549)

II. Impact

   Remote attackers exploiting the vulnerabilities described above may
   execute arbitrary code with the privileges of the user running the
   software components being attacked (e.g., Internet Explorer).
   Attackers can exploit these vulnerabilities by convincing a victim
   user to visit a malicious website, view a malformed image, or read an
   HTML-rendered email message. No user intervention is required beyond
   viewing an attacker-supplied HTML document or image. For further
   details, please see the individual vulnerability notes.

III. Solution

Apply a patch from Microsoft

   Apply the appropriate patch as specified by Microsoft Security
   Bulletin MS04-025. Please note that this bulletin provides a
   cumulative update that replaces all previously released updates for
   Internet Explorer, including those provided in MS04-004. However,
   users who have applied hotfixes released after MS04-004 will need to
   install MS04-025. Please see the FAQ section of Microsoft's advisory
   for more details.

Follow Microsoft recommendations for workarounds

   Microsoft provides several workarounds for each of these
   vulnerabilities. Please consult the appropriate section(s) of
   Microsoft Security Bulletin MS04-025.

Appendix A. Vendor Information

   This appendix contains information provided by vendors for this
   advisory. As vendors report new information to US-CERT, we will update
   this section and note the changes in our revision history. If a
   particular vendor is not listed below, we have not received their
   comments.

Microsoft

     Please see Microsoft Security Bulletin MS04-025.

Appendix B. References

     * US-CERT Technical Cyber Security Alert TA04-163A -
       <http://www.us-cert.gov/cas/techalerts/TA04-163A.html>
     * US-CERT Cyber Security Alert TA04-212A -
       <http://www.us-cert.gov/cas/alerts/SA04-212A.html>
     * US-CERT Vulnerability Note VU#266926 -
       <http://www.kb.cert.org/vuls/id/266926>
     * US-CERT Vulnerability Note VU#685364 -
       <http://www.kb.cert.org/vuls/id/685364>
     * US-CERT Vulnerability Note VU#713878 -
       <http://www.kb.cert.org/vuls/id/713878>
     * Microsoft Security Bulletin MS04-025 -
       <http://microsoft.com/technet/security/bulletin/MS04-025.asp>
     * Microsoft KB Article 867801 -
       <http://support.microsoft.com/?id=867801>
     * Microsoft KB Article 871260 -
       <http://support.microsoft.com/?id=871260>
     * Microsoft KB Article 875345 -
       <http://support.microsoft.com/?id=875345>
     * CVE CAN-2004-0566 -
       <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0566>
     * CVE CAN-2003-1048 -
       <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-1048>
     * CVE CAN-2004-0549 -
       <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0549>
     _________________________________________________________________

   Feedback can be directed to the US-CERT Technical Staff.
     _________________________________________________________________

   Copyright 2004 Carnegie Mellon University. Terms of use

   Revision History

   Jul 30, 2004: Initial release
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