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TUCoPS :: Windows Net Apps :: ciacl079.txt

Microsoft Domain Controller Core Service Memory Leak




             __________________________________________________________

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

                             INFORMATION BULLETIN

              Microsoft Domain Controller Core Service Memory Leak
                     [Microsoft Security Bulletin MS01-024]

May 12, 2001 01:00 GMT                                            Number L-079
______________________________________________________________________________
PROBLEM:       A Windows 2000 domain controller core service contains a memory 
               leak, triggered when attempting to process a certain invalid 
               service request. Repeatedly sending such a request could 
               deplete the available memory on the server. 
PLATFORM:      Microsoft Windows 2000 Server 
               Microsoft Windows 2000 Advanced Server 
               Microsoft Windows 2000 Datacenter Server 
DAMAGE:        Temporary Denial of Service. Rebooting the affected system 
               restores service. 
SOLUTION:      Apply the patches described below. 
______________________________________________________________________________
VULNERABILITY  LOW. This is a temporary and partial denial of service of 
ASSESSMENT:    attack, fixed by rebooting. It does not cause permanent damage 
               to the domain controller. 
______________________________________________________________________________

[****** Start Microsoft Advisory ******]

- ---------------------------------------------------------------------
Title:      Malformed Request to Domain Controller can
            Cause Memory Exhaustion
Date:       08 May 2001
Software:   Windows 2000 Server
            Windows 2000 Advanced Server
            Windows 2000 Datacenter Server 
Impact:     Denial of Service
Bulletin:   MS01-024

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS01-024.asp.
- ----------------------------------------------------------------------

Issue:
======
A core service running on all Windows 2000 domain controllers (but
not on any other machines) contains a memory leak, which can be triggered
when it attempts to process a certain type of invalid service
request. By repeatedly sending such a request, an attacker could deplete the 
available memory on the server. If memory were sufficiently depleted,
the domain controller could become unresponsive, which would prevent it
from processing logon requests or issuing new Kerberos tickets. An
affected machine could be put back into service by rebooting.

Mitigating Factors:
====================
 - Users who were already logged on and using previously issued
Kerberos tickets would not be affected by domain controller unavailability.
 - If there were multiple domain controllers on the domain, the
unaffected machines could pick up the other machine's load. 
 - If normal security practices have been followed, Internet users
would be prevented by firewalls and other measures from levying requests directly to domain controllers. 

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-024.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Peter Grundl of Defcom (www.defcom.com)

----------------------------------------------------------------------

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.

 [****** End Microsoft Advisory ******]

_______________________________________________________________________________

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


CIAC, the Computer Incident Advisory Center, 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
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