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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.138 -- Microsoft Security Bulletin MS02-006 (version 5.0) Unchecked Buffer in SNMP Service Could Enable Arbitrary Code to be Run 18 March 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Simple Network Management Protocol (SNMP) Service Vendor: Microsoft Operating System: Microsoft Windows 95, 98, 98SE Microsoft Windows NT 4.0, NT 4.0 Terminal Server Microsoft Windows 2000, XP Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote Ref: AL-2002.02 ESB-2002.126 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - ---------------------------------------------------------------------- Title: Unchecked Buffer in SNMP Service Could Enable Arbitrary Code to be Run Released: 12 February 2002 Revised: 14 March 2002 (Version 5.0) 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. - - ---------------------------------------------------------------------- Reason for Revision: ==================== On March 14, 2002, Microsoft discovered that the English and German patches for Windows NT 4.0 Terminal Server Edition contained incorrect files. We have corrected this error and posted updated versions of this patch for these languages. We recommend that customers who have downloaded the Windows NT 4.0 Terminal Server Edition patch in English or German prior to March 14, 2002 install the updated version. Customers who have installed the Windows NT 4.0 Terminal Server Edition patches in any language other than English or German do not need to take any action: these patches do not contain the error. 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, and Windows NT 4.0 Terminal Server Edition. 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. - - --------------------------------------------------------------------- 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. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPJW3ayh9+71yA2DNAQGYUAP+L8aU86NxzAcaaGXWfI6S+KVQEWsTblgi HrzXC1dwrVRjFNaND9aW+sIZIEBauE7NcQDP+GSkAcEGD+hFjdoD39HwCC7GuKnf Zj3lNeGGTdZJcgMPqK/m4aIU+dSdpcSoPxHMu7g0pIS6GKYDJIBUHX6wHohzBpTU lNRpluyT8ck= =W/YX -----END PGP SIGNATURE-----