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TUCoPS :: Browsers :: n-101.txt

Microsoft Cumulative Patch for Internet Explorer (CIAC N-101)




             __________________________________________________________

                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

             Microsoft Cumulative Patch for Internet Explorer (IE)
                     [Microsoft Security Bulletin MS03-020]

June 4, 2003 19:00 GMT                                            Number N-101
______________________________________________________________________________
PROBLEM:       There are two new vulnerabilities in Microsoft Internet
               Explorer: 
               (1) A buffer overrun vulnerability that occurs because Internet 
                   Explorer does not properly determine an object type returned 
                   from a web server. 
               (2) A flaw that results because Internet Explorer does not 
                   implement an appropriate block on a file download dialog box.
SOFTWARE:      Microsoft Internet Explorer 5.01 
               Microsoft Internet Explorer 5.5
               Microsoft Internet Explorer 6.0 
               Microsoft Internet Explorer 6.0 for Windows Server 2003
DAMAGE:        These vulnerabilities could enable an attacker to execute
               arbitrary code on a user's system if the user either browsed to
               a hostile web site or opened a specially crafted HTML email
               message.
SOLUTION:      Apply patch as indicated in Microsoft's bulletin.
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. An attacker would have to host a web site
ASSESSMENT:    or send a malicious email that contained a web page used to
               exploit the particular vulnerability.
______________________________________________________________________________
LINKS:
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-101.shtml
 ORIGINAL BULLETIN:  http://www.microsoft.com/technet/treeview/default.asp?url=
                        /technet/security/bulletin/MS03-020.asp
 PATCHES:            http://www.microsoft.com/windows/ie/downloads/critical
                       /818529/default.asp
______________________________________________________________________________

[***** Start Microsoft Security Bulletin MS03-020 *****]

Microsoft Security Bulletin MS03-020  

Cumulative Patch for Internet Explorer (818529)
Originally posted: June 4, 2003

Summary
Who should read this bulletin: Customers using Microsoft® Internet Explorer 

Impact of vulnerability: Allow an attacker to execute code on a user’s system 

Maximum Severity Rating: Critical 

Recommendation: System administrators should install the patch immediately 

End User Bulletin: An end user version of this bulletin is available at:

http://www.microsoft.com/security/security_bulletins/ms03-020.asp. 

Affected Software: 

Microsoft Internet Explorer 5.01 
Microsoft Internet Explorer 5.5 
Microsoft Internet Explorer 6.0 
Microsoft Internet Explorer 6.0 for Windows Server 2003 

Technical details

Technical description: 


This is a cumulative patch that includes the functionality of all previously 
released patches for Internet Explorer 5.01, 5.5 and 6.0. In addition, it 
eliminates two newly discovered vulnerabilities: 


A buffer overrun vulnerability that occurs because Internet Explorer does 
not properly determine an object type returned from a web server. It could 
be possible for an attacker who exploited this vulnerability to run arbitrary 
code on a user's system. If a user visited an attacker’s website, it would 
be possible for the attacker to exploit this vulnerability without any other 
user action. An attacker could also craft an HTML email that attempted to 
exploit this vulnerability. 

A flaw that results because Internet Explorer does not implement an 
appropriate block on a file download dialog box. It could be possible for 
an attacker to exploit this vulnerability to run arbitrary code on a user's 
system. If a user simply visited an attacker’s website, it would be possible 
for the attacker to exploit this vulnerability without any other user action. 
An attacker could also craft an HTML email that attempted to exploit this 
vulnerability. 

In order to exploit these flaws, the attacker would have to create a specially 
formed HTML email and send it to the user. Alternatively an attacker would 
have to host a malicious web site that contained a web page designed to 
exploit these vulnerabilities. The attacker would then have to persuade a user 
to visit that site. 

As with the previous Internet Explorer cumulative patches released with 
bulletins MS03-004 and MS03-015, this cumulative patch will cause 
window.showHelp( ) to cease to function if you have not applied the HTML 
Help update. If you have installed the updated HTML Help control from 
Knowledge Base article 811630, you will still be able to use HTML Help 
functionality after applying this patch.


Mitigating factors: The following mitigating factors apply to both 
vulnerabilities discussed in this bulletin:


By default, Internet Explorer on Windows Server 2003 runs in Enhanced 
Security Configuration. This default configuration of Internet Explorer 
blocks these attacks. If Internet Explorer Enhanced Security Configuration 
has been disabled, the protections put in place that prevent these 
vulnerabilities from being exploited would be removed. 

In the Web based attack scenario, the attacker would have to host a web 
site that contained a web page used to exploit these vulnerabilities. An 
attacker would have no way to force users to visit a malicious web site 
outside of the HTML email vector. Instead, the attacker would need to lure 
them there, typically by getting them to click on a link that would take 
them to the attacker's site. 

Code that executed on the system would only run under the privileges of the 
logged in user. 

Severity Rating:  

                                 Object Tag Vuln   File Download Vuln
IE 5.01 SP3                          Critical         Critical
IE 5.5 SP2                           Critical         Critical
IE 6.0 Gold                          Critical         Critical
IE 6.0 SP1                           Critical         Critical
IE 6.0 for Windows Server 2003       Moderate         Moderate



The above assessment is based on the types of systems affected by the 
vulnerability, their typical deployment patterns, and the effect that 
exploiting the vulnerability would have on them. The moderate severity 
rating on Windows Server 2003 is based on Internet Explorer Enhanced 
Security Configuration. 

Vulnerability identifier: 

Object Tag Vulnerability: CAN-2003-0344 
File Download Dialog Vulnerability: CAN-2003-0309

Tested Versions:
Internet Explorer versions 5.01 Service Pack 3, Internet Explorer 5.5 SP2, 
Internet Explorer 6.0, Internet Explorer 6.0 SP1, and Internet Explorer 6.0 
for Windows Server 2003 were tested for these vulnerabilities. Previous 
versions are no longer supported, and may or may not be affected by these 
vulnerabilities. More information on Windows Operating System Components 
Lifecycles is available from: 

http://microsoft.com/windows/lifecycle/desktop/consumer/components.mspx


Patch availability

Download locations for this patch 

http://www.microsoft.com/windows/ie/downloads/critical/818529/default.asp 


 Additional information about this patch
 
Installation platforms: 

IE5.01 running on Windows 2000 systems with Service Pack 3 installed. 
The IE 5.5 patch can be installed on systems running Service Pack 2. 

The IE 6.0 patch can be installed on systems running IE 6.0 Gold or 
Service Pack 1. 

Inclusion in future service packs:
The fix for these issues will be included in Windows XP Service Pack 2 and 
Windows Server 2003 Service Pack 1 

Reboot needed: Yes 

Patch can be uninstalled: Yes 

Superseded patches: This patch supersedes the one provided in Microsoft 
Security Bulletin MS03-015, which is itself a cumulative patch. 

Verifying patch installation: 

To verify that the patch has been installed on the machine, open Internet 
Explorer, select Help, then select About Internet Explorer and confirm that 
Q818529 is listed in the Update Versions field. 

Note that you can not use this method on Windows Server 2003 or Windows 
XP 64-Bit Edition Version 2003, as the Update Versions field is not updated 
by the package for these operating systems. 

To verify the individual files, use the patch manifest provided in Knowledge 
Base article 818529. 

Caveats:
If you have not installed the updated HTML Help control from Knowledge Base 
article 811630, you will not be able to use some HTML Help functionality after 
applying this update. In order to restore that functionality, users need to 
download the updated HTML Help control (811630). Users should also note that 
when the latest version of HTML Help is installed, the following limitations 
will occur when a help file is opened with the showHelp method: 

Only supported protocols can be used with showHelp to open a web page or help 
(chm) file.

The shortcut function supported by HTML Help will be disabled when the help 
file is opened with showHelp This will not affect the shortcut functionality 
if the same CHM file is opened by the user manually by double-clicking on the 
help file, or by through an application on the local system using the 
HTMLHELP( ) API. 

Localization:
Localized versions of this patch are available at the locations discussed in 
“Patch Availability”. 

Obtaining other security patches: 
Patches for other security issues are available from the following locations: 

Security patches are available from the Microsoft Download Center, and can be 
most easily found by doing a keyword search for "security_patch". 

Patches for consumer platforms are available from the WindowsUpdate web site 

Other information: 

Acknowledgments
Microsoft thanks  eEye Digital Security for reporting this issue to us and 
working with us to protect customers. 

Support: 

Microsoft Knowledge Base article 818529 discusses this issue. Knowledge Base 
articles can be found on the Microsoft Online Support web site. 

Technical support is available from Microsoft Product Support Services. 
There is no charge for support calls associated with security patches. 

Scanning for Updates:

As part of Microsoft's Strategic Technology Protection Program, and in 
response to direct customer need for a streamlined method of identifying 
common security misconfigurations, Microsoft has developed the Microsoft 
Baseline Security Analyzer (MBSA). 

MBSA version 1.1.1 adds support for Windows Server 2003 and will be available 
approximately 24 hours after the release of this bulletin at the following 
location:

http://www.microsoft.com/technet/treeview/default.asp?url=
     /technet/security/tools/Tools/MBSAhome.asp


Security Resources: The Microsoft TechNet Security Web Site provides 
additional information about security in Microsoft products. 

Disclaimer: 
The information provided in the Microsoft Knowledge Base is provided "as is" 
without warranty of any kind. Microsoft disclaims all warranties, either 
express or implied, including the warranties of merchantability and fitness 
for a particular purpose. In no event shall Microsoft Corporation or its 
suppliers be liable for any damages whatsoever including direct, indirect, 
incidental, consequential, loss of business profits or special damages, 
even if Microsoft Corporation or its suppliers have been advised of the 
possibility of such damages. Some states do not allow the exclusion or 
limitation of liability for consequential or incidental damages so the 
foregoing limitation may not apply. 

Revisions: 

V1.0 (June 4, 2003): Bulletin published. 


[***** End Microsoft Security Bulletin MS03-020 *****]
_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Microsoft Corporation for the
information contained in this bulletin.
_______________________________________________________________________________

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
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    FAX:      +1 925-423-8002
    STU-III:  +1 925-423-2604
    E-mail:   ciac@ciac.org

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

   World Wide Web:      http://www.ciac.org/
   Anonymous FTP:       ftp.ciac.org

PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins.  If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.

This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
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otherwise, does not necessarily constitute or imply its endorsement,
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