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Title:      Unchecked Buffer in SNMP Service Could Enable Arbitrary
            Code to be Run
Released:   12 February 2002
Revised:    15 February 2002 (Version 2.0)
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 February 12 2002, Microsoft released the original version of this
bulletin. In it, we detailed a work-around procedure that customers
could implement to protect themselves against a publicly disclosed
vulnerability. An updated version of this bulletin was released on
February 15, 2002, to announce the availability of the patch for
Windows 2000 and Windows XP and to advise customers that the
work-around procedure is no longer needed on those platforms. Patches
for additional platforms are forthcoming and this bulletin will
be re-released to annouce their availability.

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 2000
   and Windows XP. Please read the Security Bulletin at
   http://www.microsoft.com/technet/security/bulletin/ms02-006.asp
   for information on obtaining this patch.

 - Patches for other platforms are under development and will be
   available shortly. When this happens, we will re-release this
   bulletin with information on how to obtain and install these
   patches. 


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