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National Cyber Alert System
Technical Cyber Security Alert TA04-196A
Multiple Vulnerabilities in Microsoft Windows Components and Outlook Express
Original release date: July 14, 2004
Last revised: --
Source: US-CERT
Systems Affected
* Microsoft Windows Systems
Overview
Microsoft has released a Security Bulletin Summary for July, 2004.
This summary includes several bulletins that address vulnerabilities
in various Windows applications and components. Exploitation of some
vulnerabilities can result in the remote execution of arbitrary code
by a remote attacker. Details of the vulnerabilities and their impacts
are provided below.
I. Description
The table below provides a reference between Microsoft's Security
Bulletins and the related US-CERT Vulnerability Notes. More
information related to the vulnerabilities is available in these
documents.
_________________________________________________________________
Format:
Microsoft Security Bulletin
Related US-CERT Vulnerability Note(s)
_________________________________________________________________
MS04-024: Vulnerability in Windows Shell Could Allow Remote Code
Execution (839645)
VU#106324 Microsoft Windows contains a
vulnerability in the way the Windows Shell launches applications
_________________________________________________________________
MS04-023: Vulnerability in HTML Help Could Allow Code Execution
(840315)
VU#187196 Microsoft Windows fails to properly process
showHelp URLs
VU#920060 Microsoft Windows HTML Help component fails to properly
validate input data
_________________________________________________________________
MS04-022: Vulnerability in Task Scheduler Could Allow Code Execution
(841873)
VU#228028 Microsoft Windows Task Scheduler Buffer Overflow
_________________________________________________________________
MS04-021: Security Update for IIS 4.0 (841373)
VU#717748 Microsoft Internet Information Server (IIS) 4.0 contains a
buffer overflow in the redirect function
_________________________________________________________________
MS04-020: Vulnerability in POSIX Could Allow Code Execution (841872)
VU#647436 Microsoft Windows contains a buffer overflow in the POSIX
subsystem
_________________________________________________________________
MS04-019: Vulnerability in Utility Manager Could Allow Code Execution
(842526)
VU#868580 Microsoft Windows Utility Manager launches applications with
system privileges
_________________________________________________________________
MS04-018: Cumulative Security Update for Outlook Express (823353)
VU#869640 Microsoft Outlook Express fails to properly validate
malformed e-mail headers
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II. Impact
A remote, unauthenticated attacker may exploit VU#717748 to execute
arbitrary code on an IIS 4.0 system.
Exploitation of VU#106324, VU#187196, VU#920060, and VU#228028, would
permit a remote attacker to execute arbitrary code with the privileges
of the current user. The attacker would have to convince a victim to
view an HTML document (web page, HTML email) or click on a crafted URI
link.
Vulnerabilities described in VU#647436 and VU#868580 permit a local
user to gain elevated privileges on the local system.
Exploitation of VU#869640 can lead to a denial-of-service condition
against Outlook Express.
III. Solution
Apply a patch
Microsoft has provided the patches for these vulnerabilities in the
Security Bulletins and on Windows Update.
Do not follow unsolicited links
It is generally a good practice not to click on unsolicited URLs
received in email, instant messages, web forums, or Internet relay
chat (IRC) channels. However, this practice does not always prevent
exploitation of these types vulnerabilities. For example, a trusted
web site could be compromised and modified to deliver exploit script
to unsuspecting clients.
Maintain updated anti-virus software
Anti-virus software with updated virus definitions may identify and
prevent some exploit attempts, but variations of exploits or attack
vectors may not be detected. Do not rely solely on anti-virus software
to defend against these vulnerabilities. More information about
viruses and anti-virus vendors is available on the US-CERT Computer
Virus Resources page.
Appendix A. Vendor Information
Specific information about these issue are available in the Security
Bulletin Summary for July, 2004 and the US-CERT Vulnerability Notes.
Appendix B. References
* Microsoft's Security Bulletin Summary for July, 2004 -
<http://www.microsoft.com/technet/security/bulletin/ms04-jul.mspx>
* US-CERT Vulnerability Note VU#106324 -
<http://www.kb.cert.org/vuls/id/106324>
* US-CERT Vulnerability Note VU#187196 -
<http://www.kb.cert.org/vuls/id/187196>
* US-CERT Vulnerability Note VU#920060 -
<http://www.kb.cert.org/vuls/id/920060>
* US-CERT Vulnerability Note VU#228028 -
<http://www.kb.cert.org/vuls/id/228028>
* US-CERT Vulnerability Note VU#717748 -
<http://www.kb.cert.org/vuls/id/717748>
* US-CERT Vulnerability Note VU#647436 -
<http://www.kb.cert.org/vuls/id/647436>
* US-CERT Vulnerability Note VU#868580 -
<http://www.kb.cert.org/vuls/id/868580>
* US-CERT Vulnerability Note VU#869640 -
<http://www.kb.cert.org/vuls/id/869640>
* Increase Your Browsing and E-Mail Safety -
<http://www.microsoft.com/security/incident/settings.mspx>
* Working with Internet Explorer 6 Security Settings -
<http://www.microsoft.com/windows/ie/using/howto/security/settings
.mspx>
_________________________________________________________________
This alert was created by Jason A. Rafail. Feedback can be directed to
the Vulnerability Note authors: Jason A. Rafail, Jeff P. Lanza, Chad
R. Dougherty, Damon G. Morda, and Art Manion.
_________________________________________________________________
This document is available from:
<http://www.us-cert.gov/cas/techalerts/TA04-196A.html>
_________________________________________________________________
Copyright 2004 Carnegie Mellon University.
Terms of use: <http://www.us-cert.gov/legal.html>
_________________________________________________________________
Revision History
July 14, 2004: Initial release
Last updated July 14, 2004
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