MS Security Bulletin MS02-006

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Title:      Unchecked Buffer in SNMP Service Could Enable Arbitrary
           Code to be Run
Date:       12 February 2002
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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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 under development and will be available shortly.
  When this happens, we will re-release this bulletin with
  information on how to obtain and install the patch.
  Please read the Security Bulletin at
  http://www.microsoft.com/technet/security/bulletin/ms02-006.asp
  for information on steps to protect against the vulnerability
  until the patch is ready.

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