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TUCoPS :: Windows :: n-063.txt

Microsoft Windows Script Engine Vulnerability (CIAC N-063)




             __________________________________________________________

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

                             INFORMATION BULLETIN

                 Microsoft Windows Script Engine Vulnerability
                     [Microsoft Security Bulletin MS03-008]

March 20, 2003 22:00 GMT                                          Number N-063
______________________________________________________________________________
PROBLEM:       A flaw exists in the way Windows Script Engine for JScript 
               processes information. An attacker could exploit the 
               vulnerability by constructing a web page that, when visited by 
               the user, would execute code of the attacker’s choice with the 
               user’s privileges. 
PLATFORM:      Microsoft Windows 98 Microsoft Windows 98 Second Edition 
               Microsoft Windows Me Microsoft Windows NT 4.0 Microsoft Windows 
               NT 4.0 Terminal Server Edition Microsoft Windows 2000 Microsoft 
               Windows XP 
DAMAGE:        Run code of attacker's choice. 
SOLUTION:      Apply patch as stated in Microsoft's bulletin. 
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. For an attack to be successful, the user 
ASSESSMENT:    would need to visit a website under the attacker's control or 
               receive an HTML e-mail from the attacker. 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-063.shtml 
 ORIGINAL BULLETIN:                                                           
                     http://www.microsoft.com/technet/treeview
                           /default.asp?url=/technet/security/bulletin
                            /MS03-008.asp 
______________________________________________________________________________

[***** Start Microsoft Security Bulletin MS03-008 *****]

Microsoft Security Bulletin MS03-008 

Flaw in Windows Script Engine Could Allow Code Execution (814078)
Originally posted: March 19, 2003

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

Impact of vulnerability: Run Code of Attacker’s Choice 

Maximum Severity Rating: Critical 

Recommendation: Customers 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/ms03-008.asp.

Affected Software: 

Microsoft Windows 98 
Microsoft Windows 98 Second Edition 
Microsoft Windows Me 
Microsoft Windows NT 4.0 
Microsoft Windows NT 4.0 Terminal Server Edition 
Microsoft Windows 2000 
Microsoft Windows XP 

 Technical details
Technical description: 


The Windows Script Engine provides Windows operating systems with the 
ability to execute script code. Script code can be used to add 
functionality to web pages, or to automate tasks within the operating 
system or within a program. Script code can be written in several 
different scripting languages, such as Visual Basic Script, or JScript.

A flaw exists in the way by which the Windows Script Engine for JScript 
processes information. An attacker could exploit the vulnerability by 
constructing a web page that, when visited by the user, would execute 
code of the attacker’s choice with the user’s privileges. The web page 
could be hosted on a web site, or sent directly to the user in email. 

Although Microsoft has supplied a patch for this vulnerability and 
recommends all affected customers install the patch immediately, 
additional preventive measures have been provided that customers can 
use to help block the exploitation of this vulnerability while they 
are assessing the impact and compatibility of the patch. These 
temporary workarounds are discussed in the “Workarounds” section in 
the FAQ below. 

Mitigating factors: 

* For an attack to be successful, the user would need to visit a website 
under the attacker's control or receive an HTML e-mail from the attacker. 
* Computers configured to disable active scripting in Internet Explorer 
are not susceptible to this issue. 
* Exploiting the vulnerability would allow the attacker only the same 
privileges as the user. Users whose accounts are configured to have few 
privileges on the system would be at less risk than ones who operate 
with administrative privileges. 
* Automatic exploitation of the vulnerability by an HTML email would be 
blocked by Outlook Express 6.0 and Outlook 2002 in their default 
configurations, and by Outlook 98 and 2000 if used in conjunction with 
the Outlook Email Security Update. 

Severity Rating: 	
		Windows 98 				Critical 
		Windows 98 Second Edition 		Critical 
		Windows Me 				Critical 
		Windows NT 4.0 				Critical 
		Windows NT 4.0 Terminal Server Edition 	Critical 
		Windows 2000 				Critical 
		Windows XP 				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: CAN-2003-0010 

Tested Versions:
Microsoft tested Windows 98, Windows 98 Second Edition, Windows Me, 
Windows NT 4.0, Windows NT 4.0 Terminal Server Edition, Windows 2000, 
and Windows XP to assess whether they are affected by these 
vulnerabilities. Previous versions are no longer supported, and may 
or may not be affected by these vulnerabilities.


Patch availability
Download locations for this patch 
The patches for all Windows systems are available via Windows Update. 
In addition, these patches are also available for download to allow 
the patches to be manually installed. 

Windows 98 and Windows 98 SE:
http://www.microsoft.com/windows98/downloads/contents/WUCritical
       /q814078/default.asp 

Windows Me:
Windows Update. 

Windows NT 4.0:
http://microsoft.com/downloads
/details.aspx?FamilyId=C6504FD9-5E2C-45BF-9424-55D7C5D2221B&displaylang=en 

Windows NT 4.0, Terminal Server Edition:
http://microsoft.com/downloads
/details.aspx?FamilyId=C6504FD9-5E2C-45BF-9424-55D7C5D2221B&displaylang=en 

Windows 2000:
http://microsoft.com/downloads
/details.aspx?FamilyId=824B1BD4-B4D6-49D5-8C58-199BDC731B64&displaylang=en 

Windows XP Home Edition and Professional Edition:
http://microsoft.com/downloads
/details.aspx?FamilyId=824B1BD4-B4D6-49D5-8C58-199BDC731B64&displaylang=en 


 Additional information about this patch
Installation platforms: 

* The Window 98 patch can be installed on systems running Windows 98 Gold. 
* The Window 98SE patch can be installed on systems running Windows 98SE Gold. 
* The Windows Me patch can be installed on systems running Windows Me Gold. 
* The Windows NT 4.0 patch can be installed on systems running Service Pack 6a. 
* The Windows NT 4.0 Terminal Server Edition patch can be installed on systems 
running Windows NT 4.0 Terminal Server Edition Service Pack 6. 
* The Windows 2000 patch can be installed on systems running Windows 2000 
Service Pack 2 or Service Pack 3. 
* The patch for Windows XP can be installed on systems running Windows XP Gold 
or Service Pack 1. 

Inclusion in future service packs:
The fix for this issue will be included in Windows 2000 Service Pack 4 and 
Windows XP Service Pack 2. 

Reboot needed: Yes 

Patch can be uninstalled: No 

Superseded patches: None. 

Verifying patch installation: To verify that the patch has been installed on 
the machine, confirm that the following registry key has been created on the 
machine: 

* Windows 98, Windows 98SE and Window Me: 
To verify that the patch has been installed on the machine, use the Qfecheck.exe 
tool and confirm that the display includes the following information:

UPD814078 Windows xx Q814078 Update

where xx is “98” for Windows 98 or 98SE, or “Me” for Windows Me. 

To verify the individual files, consult the file manifest in Knowledge 
Base article Q814078. 

* Windows NT 4.0: 
To verify that the patch has been installed on the machine, confirm that all 
files listed in the file manifest in Knowledge Base article Q814078 are 
present on the system. 

* Windows NT 4.0 Terminal Server Edition: 
To verify that the patch has been installed on the machine, confirm that all 
files listed in the file manifest in Knowledge Base article Q814078 are 
present on the system. 

* Windows 2000: 
To verify that the patch has been installed on the machine, confirm that the 
following registry key has been created on the machine: 

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows 2000\SP4\Q814078.

To verify the individual files, use the date/time and version information 
provided in the following registry key: 

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows 2000\SP4\Q814078\Filelist. 

* Windows XP: 
To verify that the patch has been installed, confirm that the following registry 
key has been created on the machine:

HKLM\Software\Microsoft\Updates\Windows XP\SP2\Q814078. 

To verify the individual files, use the date/time and version information 
provided in the following registry key:

HKLM\Software\Microsoft\Updates\Windows XP\SP2\Q814078\Filelist. 


Caveats:
None 

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: 
Support: 

* Knowledge Base Article 814078 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 (March 19, 2003): Bulletin Created.

[***** End Microsoft Security Bulletin MS03-008 *****]

_______________________________________________________________________________

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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    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
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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,
recommendation or favoring by the United States Government or the
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