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TUCoPS :: Browsers :: n-082.txt

Microsoft Cumulative Patch for Internet Explorer (CIAC N-082)




             __________________________________________________________

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

                             INFORMATION BULLETIN

             Microsoft Cumulative Patch for Internet Explorer (IE)
                     [Microsoft Security Bulletin MS03-015]

April 24, 2003 20:00 GMT                                          Number N-082
______________________________________________________________________________
PROBLEM:       There are four vulnerabilities in Microsoft Internet Explorer: 
               (1) A buffer overrun vulnerability occurs in URLMON.DLL because 
               IE does not correctly check the parameters of information being 
               received from a web server. 
               (2) A vulnerability in the IE file upload control that allows 
               input from a script to be passed to the upload control. 
               (3) A flaw in the way IE handles the rendering of third party 
               files. 
               (4) A flaw in the way modal dialogs are treated by IE because 
               an input parameter is not properly checked. 
SOFTWARE:      * Microsoft Internet Explorer 5.01 
               * Microsoft Internet Explorer 5.5 
               * Microsoft Internet Explorer 6.0 
DAMAGE:        The most serious of 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-082.shtml 
 ORIGINAL BULLETIN:                                                           
                     http://www.microsoft.com/technet/treeview/
                       default.asp?url=/technet/security/bulletin/MS03-015.asp 
______________________________________________________________________________

[***** Start Microsoft Security Bulletin MS03-015 *****]

Microsoft Security Bulletin MS03-015 

Cumulative Patch for Internet Explorer (813489)
Originally posted: April 23, 2003

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

Impact of vulnerability: Four new vulnerabilities, the most serious 
of which 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. 

Maximum Severity Rating: Critical 

Recommendation: System administrators should install the 
patch immediately 

Affected Software: 

* Microsoft Internet Explorer 5.01 
* Microsoft Internet Explorer 5.5 
* Microsoft Internet Explorer 6.0 

 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 the following four newly discovered 
vulnerabilities: 

* A buffer overrun vulnerability in URLMON.DLL that occurs because Internet 
  Explorer does not correctly check the parameters of information being 
  received from a web server. It could be possible for an attacker to 
  exploit this vulnerability to run arbitrary code on a user's system. 
  A user simply visiting an attacker’s website could allow the attacker to 
  exploit the vulnerability without any other user action.

* A vulnerability in the Internet Explorer file upload control that allows 
  input from a script to be passed to the upload control. This vulnerability 
  could allow an attacker to supply a file name to the file upload control and 
  automatically upload a file from the user’s system to a web server.

* A flaw in the way Internet Explorer handles the rendering of third party 
  files. The vulnerability results because the Internet Explorer method for 
  rendering third party file types does not properly check parameters passed to 
  it. An attacker could create a specially formed URL that would inject script 
  during the rendering of a third party file format and cause the script to 
  execute in the security context of the user.

* A flaw in the way modal dialogs are treated by Internet Explorer that 
  occurs because an input parameter is not properly checked. This flaw could 
  allow an attacker to use an injected script to provide access to files 
  stored on a user’s computer. Although a user who visited the attacker’s 
  website could allow the attacker to exploit the vulnerability without any 
  other user action, an attacker would have no way to force the user to visit 
  the website.

In addition to eliminating the above vulnerabilities, this patch also includes 
a fix for Internet Explorer 6.0 SP1 that corrects the method by which Internet 
Explorer displays help information in the local computer zone. While we are not 
aware of a method to exploit this vulnerability by itself, if it were possible 
to exploit it, it could allow an attacker to read local files on a visiting 
user’s system. 

This patch also sets the Kill Bit on the Plugin.ocx ActiveX control which has 
a security vulnerability. This killbit has been set in order to ensure that 
the vulnerable control cannot be reintroduced onto users’ systems and to 
ensure that users who already have the vulnerable control on their system are 
protected. This issue is discussed further in Microsoft Knowledge Base Article 
813489. 

Like the previous Internet Explorer cumulative patch released with bulletin 
MS03-004, 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:

There are common mitigating factors across all of the vulnerabilities: 

* The attacker would have to host a web site that contained a web page used to 
  exploit the particular vulnerability. 
* By default, Outlook Express 6.0 and Outlook 2002 open HTML mails in the 
  Restricted Sites Zone. In addition, Outlook 98 and 2000 open HTML mails in 
  the Restricted Sites Zone if the Outlook Email Security Update has been 
  installed. Customers who use any of these products would be at no risk from 
  an e-mail borne attack that attempted to automatically exploit these 
  vulnerabilities. The attacker would have no way to force users to visit a 
  malicious web site. 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. 

In addition to the common factors, there are a number of individual mitigating 
factors: 

URLMON.DLL Buffer Overrun: 

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

File Upload Control vulnerability: 

* The attacker would have to know the explicit path and name of the file to be 
  uploaded in advance. 

Third Party plug-in rendering:

* The third party plugin would have to be present on the user’s system in order 
  for it to be exploited

Severity Rating:

                 Internet Explorer   Internet Explorer Internet Explorer Internet Explorer
                     5.01 SP3             5.5 SP2           6.0 Gold         6.0 SP1 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
URLMON.DLL           Critical             Critical          Critical         Critical 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
File Upload Control 
Vulnerability        Moderate             Moderate          Moderate         Moderate 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Third Party Plugin 
Rendering            Critical             Critical          Critical         Critical 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Model Dialog Script 
Execution            Critical             Critical          Critical         Critical 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Aggregate Severity 
of all issues 
included in this 
patch                Critical             Critical          Critical         Critical 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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. 

Vulnerability identifier: 

* URLMON.DLL Buffer Overrun: CAN-2003-0113 
* File Upload Control vulnerability: CAN-2003-0114 
* Third Party plug-in rendering: CAN-2003-0115 
* Model Dialog script execution: CAN-2003-0116

Tested Versions:
Internet Explorer versions 5.01 Service Pack 3, Internet Explorer 5.5 SP2, 
Internet Explorer 6.0 and Internet Explorer 6.0 SP1 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/813489/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 Internet Explorer 5.5 
  Service Pack 2. 
* The IE 6.0 patch can be installed on systems running IE 6.0 Gold or Internet 
  Explorer 6.0 Service Pack 1. 

Inclusion in future service packs:
The fix for this issue will be included in Internet Explorer 6.0 Service Pack 2. 

Reboot needed: Yes 

Patch can be uninstalled: Yes 

Superseded patches: This patch supersedes the one provided in Microsoft Security 
Bulletin MS03-004, which is itself a cumulative patch. 

Verifying patch installation: 

* To verify that the patch has been installed on the machine, open IE, select 
  Help, then select About Internet Explorer and confirm that Q813489 is listed in 
  the Update Versions field. 
* To verify the individual files, use the patch manifest provided in Knowledge 
  Base article 813489. 

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 the following for working with us to protect customers:

Mark Litchfield of Next Generation Security Software Ltd. for reporting the 
PLUGIN.OCX issue to us.

Andreas Sandblad, Sweden for reporting the showhelp issue to us.

Jouko Pynnönen of Oy Online Solutions Ltd, Finland for reporting the URLMON.DLL 
Buffer Overrun issue to us.

Support: 

* Microsoft Knowledge Base article 813489 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. 

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 April 23, 2003: Bulletin Created. 

[***** End Microsoft Security Bulletin MS03-015 *****]

_______________________________________________________________________________

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
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PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
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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
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