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  DoS против Kerberos в Windows 2000 (memory leakage)

  def-2001-24: Windows 2000 Kerberos DoS

From:MICROSOFT <secure_(at)_microsoft.com>
Date:10.05.2001
Subject:Security Bulletin MS01-024

The following is a Security  Bulletin from the Microsoft Product Security
Notification Service.

Please do not  reply to this message,  as it was sent  from an unattended
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                   ********************************

-----BEGIN PGP SIGNED MESSAGE-----

- ---------------------------------------------------------------------
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)

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

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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
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EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR
INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

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