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===========================================================================
             AUSCERT External Security Bulletin Redistribution

           ESB-2001.345 -- Microsoft Security Bulletin MS01-043
   NNTP Service in Windows NT 4.0 and Windows 2000 Contains Memory Leak
                              16 August 2001

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                NNTP Service
Vendor:                 Microsoft
Operating System:       Windows NT 4.0
                        Windows 2000
Impact:                 Denial of Service
Access Required:        Remote

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Title:      NNTP Service in Windows NT 4.0 and Windows 2000 
            Contains Memory Leak
Date:       14 August 2001
Software:   Windows NT 4.0, Windows 2000
Impact:     Denial of service
Bulletin:   MS01-043

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS01-043.asp.
- - ----------------------------------------------------------------------

Issue:
======
The NNTP (Network News Transport Protocol) service in Windows NT 4.0 
and Windows 2000 contains a memory leak in a routine that processes 
news postings. Each time such a posting is processed that contains a 
particular construction, the memory leak causes a small amount of 
memory to no longer be available for use. If an attacker sent a large
number of posts, the server memory could be depleted to the point at 
which normal service would be disrupted. An affected server could be 
restored to normal service by rebooting. 

Mitigating Factors:
====================
 - Windows NT 4.0 does not contain a native NNTP service. NNTP 
   is only available on the system if the Windows NT 4.0 Option 
   Pack has been installed. 
 - The default configuration of NNTP is not affected by the 
   vulnerability, as no newsgroups are configured by default. 
 - The vulnerability would not enable an attacker to usurp any 
   administrative control or compromise data on the machine. 

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-043.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Aiden ORawe 

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

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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