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TUCoPS :: Windows :: n-077.txt

Microsoft Buffer Overrun in Kernel Message Handling (CIAC N-077)




             __________________________________________________________

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

                             INFORMATION BULLETIN

       Microsoft Buffer Overrun in Kernel Message Handling Vulnerability
                     [Microsoft Security Bulletin MS03-013]

April 16, 2003 19:00 GMT                                          Number N-077
[Revised 28 May 2003]
______________________________________________________________________________
PROBLEM:       A flaw has been discovered in the way the kernel passes error
               messages to a debugger.
PLATFORM:      Microsoft Windows NT 4.0 
               Microsoft Windows NT 4.0 Server, Terminal Server Edition 
               Microsoft Windows 2000 
               Microsoft Windows XP
DAMAGE:        A local attacker could potentially gain elevated privileges,
               including root privileges, and execute arbitrary code.
SOLUTION:      Apply appropriate Microsoft patch.
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. A local attacker could exploit this
ASSESSMENT:    vulnerability to take any action on the system including
               deleting data, adding accounts with administrative access, or
               reconfiguring the system. The local attacker would need to be
               able to logon interactively to the system, either at the
               console or through a terminal session.
______________________________________________________________________________
LINKS:
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-077.shtml
 ORIGINAL BULLETIN:  http://www.microsoft.com/technet/treeview/default.asp?url
                        =/technet/security/bulletin/MS03-013.asp
______________________________________________________________________________

[***** Start Microsoft Security Bulletin MS03-013 *****]

Microsoft Security Bulletin MS03-013

Buffer Overrun in Windows Kernel Message Handling could Lead 
to Elevated Privileges (811493)
Originally posted: April 16, 2003 

Updated: May 28, 2003

Summary
Who should read this bulletin: Administrators of Microsoft® 
Windows NT® 4.0, Windows® 2000 and Windows® XP systems. 

Impact of vulnerability: Local Elevation of Privilege 

Maximum Severity Rating: Important 

Recommendation: Customers should install the patch at the earliest 
opportunity.

Affected Software: 

Microsoft Windows NT 4.0 
Microsoft Windows NT 4.0 Server, Terminal Server Edition 
Microsoft Windows 2000 
Microsoft Windows XP 
Non Affected Software: 

Windows Server 2003 
End User Bulletin: An end user version of this bulletin is available 
at: http://www.microsoft.com/security/security_bulletins/ms03-013.asp.

 Technical details
Technical description: 

Microsoft re-issued this bulletin on May 28, 2003 to advise on the availability 
of an updated Windows XP Service Pack 1 patch. This revised patch corrects the 
performance issues that some customers experienced with the original Windows XP 
Service Pack 1 patch. 

Microsoft originally issued this bulletin on April 16, 2003. Subsequent to that 
date, Microsoft received reports of performance problems with the patch from some 
Windows XP Service Pack 1 customers. This original Windows XP Service Pack 1 
patch did address the security vulnerability discussed in this security bulletin. 
Microsoft investigated this performance issue and confirmed that there could be 
performance problems when the original patch was applied to Windows XP Service 
Pack 1 systems. Microsoft has published a Knowledge Base article, 819634, that 
describes the known circumstances that can cause the performance problems to 
manifest themselves with the original patch. Microsoft has subsequentially 
re-issued the Windows XP Service Pack 1 patch to correct the performance 
problems. This revised patch can be downloaded from the locations described later 
in this bulletin. 

The Windows kernel is the core of the operating system. It provides system level 
services such as device and memory management, allocates processor time to 
processes and manages error handling. There is a flaw in the way the kernel passes 
error messages to a debugger. A vulnerability results because an attacker could write 
a program to exploit this flaw and run code of their choice. An attacker could 
exploit this vulnerability to take any action on the system including deleting data, 
adding accounts with administrative access, or reconfiguring the system. 

For an attack to be successful, an attacker would need to be able to logon 
interactively to the system, either at the console or through a terminal session. 
Also, a successful attack would require the introduction of code in order to exploit 
this vulnerability. Because best practices recommends restricting the ability to logon 
interactively on servers, this issue most directly affects client systems and terminal 
servers. 

Mitigating factors: 

* A successful attack requires the ability to logon interactively to the target machine, 
  either directly at the console or through a terminal session. 
* Properly secured servers would be at little risk from this vulnerability. Standard 
  best practices recommend only allowing trusted administrators to log onto such systems 
  interactively; without such privileges, an attacker could not exploit the vulnerability. 

Severity Rating: Windows NT 4.0 				Important 
		 Windows NT 4.0, Terminal Server Edition 	Important 
		 Windows 2000 					Important 
		 Windows XP 					Important 
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-2003-0112 

Tested Versions:
Microsoft tested Windows NT4, 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 

* Windows NT 4.0:

 * All except Japanese NEC and Chinese - Hong Kong 
 * Japanese NEC 
 * Chinese - Hong Kong 

* Windows NT 4.0, Terminal Server Edition:

 * All 

* Windows 2000: 

 * All except Japanese NEC 
 * Japanese NEC 

* Windows XP:

 * 32-bit Edition 
 * 64-bit Edition 

 Additional information about this patch

Installation platforms: 

* 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: Yes 

Superseded patches: 

* The Windows 2000 patch supercedes the Windows 2000 patch discussed in Microsoft 
  Security Bulletin MS03-007. 
* The Windows NT 4.0 and Windows XP patches do not supercede any other patches. 

Verifying patch installation: 

* 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 811493 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 811493 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\Q811493. 

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\Q811493\Filelist. 

* Windows XP: 

 * If installed on Windows XP Gold: 

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\SP1\Q811493. 

To verify the individual files, use the date/time and version information provided in the 
following registry key: HKLM\Software\Microsoft\Updates\Windows XP\SP1\Q811493\Filelist. 


 * If installed on Windows XP Service Pack 1: 

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\Q811493. 

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\Q811493\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: 

Acknowledgments
Microsoft thanks Oded Horovitz of Entercept™ Security Technologies for reporting this 
issue to us and working with us to protect customers.

Support: 

* Microsoft Knowledge Base article 811493 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 16, 2003: Bulletin Created. 
* V1.1 April 17, 2003: Included correct patch supercedence information for Windows 2000. 
* V1.2 April 23, 2003: Added information regarding performance related issues with 
  Windows XP SP1 patch 
* V1.2 April 23, 2003: Added link to KB article that discusses performance related issues 
  with Windows XP SP1 patch 
* V2.0 May 28, 2003: Re-issued to advise of availability of revised Windows XP SP1 patch 
  to correct performance issues 

[***** End Microsoft Security Bulletin MS03-013 *****]

_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Microsoft 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.

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available from the CIAC Computer Security Archive.

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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
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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