Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2001.192 -- Microsoft Security Bulletin MS01-024
Malformed Request to Domain Controller can Cause Memory Exhaustion
10 May 2001
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows domain controllers
Vendor: Microsoft
Operating System: Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Datacenter Server
Impact: Denial of Service
Access Required: Remote
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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.
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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)
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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.
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