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

           ESB-2001.319 -- Microsoft Security Bulletin MS01-041
              Malformed RPC Request Can Cause Service Failure
                               27 July 2001

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

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

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

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Title:      Malformed RPC Request Can Cause Service Failure
Date:       26 July 2001
Software:   Exchange Server 5.5, Exchange Server 2000, 
            SQL Server 7.0, SQL Server 2000, Windows NT 4.0,
            Windows 2000
Impact:     Denial of service
Bulletin:   MS01-041

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS01-041.asp.
- - ----------------------------------------------------------------------

Issue:
======
Several of the RPC servers associated with system services in
Microsoft 
Exchange, SQL Server, Windows NT 4.0 and Windows 2000 do not
adequately 
validate inputs, and in some cases will accept invalid inputs that 
prevent normal processing. The specific input values at issue here
vary 
from RPC server to RPC server. 

An attacker who sent such inputs to an affected RPC server could 
disrupt its service. The precise type of disruption would depend on
the 
specific service, but could range in effect from minor (e.g., the 
service temporarily hanging) to major (e.g., the service failing in a
way that would require the entire system to be restarted). 

Mitigating Factors:
====================
 - Proper firewalling would help minimize an affected system's 
   exposure to attack by Internet-based users. In general, a 
   firewall should block access to all RPC services except 
   those that are specifically intended for use by untrusted users. 

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-041.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Bindview's Razor Team (http://razor.bindview.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.



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