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

    ESB-2002.203 -- Microsoft Security Bulletin MS02-006 (Version 6.0)
  Unchecked Buffer in SNMP Service Could Enable Arbitrary Code to be Run
                                1 May 2002

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

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

Product:                Simple Network Management Protocol (SNMP) Service
Vendor:                 Microsoft
Operating System:       Microsoft Windows 95
                        Microsoft Windows 98
                        Microsoft Windows 98SE
                        Microsoft Windows NT 4.0
                        Microsoft Windows NT 4.0 Terminal Server
                        Microsoft Windows 2000
                        Microsoft Windows XP
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Remote

Ref:                    ESB-2002.070
                        AL-2002.02

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Title:      Unchecked Buffer in SNMP Service Could Enable Arbitrary
            Code to be Run
Released:   12 February 2002
Revised:    26 April 2002 (Version 6.0)
Software:   Microsoft Windows 95, 98, 98SE, NT 4.0, NT 4.0 Terminal
            Server Edition, 2000, XP
Impact:     Denial of Service, potentially run code of
            attacker's choice
Max Risk:   Moderate
Bulletin:   MS02-006

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS02-006.asp.

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Reason for Revision:
====================
On April 26, 2002, Microsoft released an updated version of the
bulletin annoucing the availability of a patch for Windows 98 and
Windows 98SE and to advise customers that the work-around procedure
is no longer needed for that platform. 

Issue:
======

Simple Network Management Protocol (SNMP) is an Internet standard
protocol for managing disparate network devices such as firewalls,
computers, and routers. All versions of Windows except Windows ME
provide an SNMP implementation, which is neither installed nor 
running by default in any version. 

A buffer overrun is present in all implementations. By sending a
specially malformed management request to a system running an 
affected version of the SNMP service, an attacker could cause a
denial of service. In addition, it is possible that he cause code
to run on the system in LocalSystem context. This could
potentially give the attacker the ability to take any desired
action on the system. 

A patch is under development to eliminate the vulnerability.
In the meantime, Microsoft recommends that customers who use the
SNMP service disable it temporarily. Patches will be available
shortly, at which time we will re-release this bulletin with
updated details. 

Mitigating Factors:
====================
 - The SNMP service is neither installed nor running by default
   in any version of Windows. 

 - Standard firewalling practices recommend blocking the port
   over which SNMP operates (UDP ports 161 and 162). If these
   recommendations have been followed, the vulnerability could
   only be exploited by an intranet user. 

 - Standard security recommendations recommend against using SNMP
   except on trusted networks, as the protocol, by design,
   provides minimal security. 

Risk Rating:
============
 - Internet systems: Low
 - Intranet systems: Moderate
 - Client systems: Moderate

Patch Availability:
===================
 - A patch is available to fix this vulnerability for WIndows XP,
   Windows 2000, WIndows NT 4.0, Windows NT 4.0 Terminal
   Server Edition and Windows 98/98SE.  Please read the Security
   Bulletin at
   http://www.microsoft.com/technet/security/bulletin/ms02-006.asp
   for information on obtaining this patch.

- - - -
- - -
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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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