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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.116 -- Microsoft Security Bulletin MS02-006 (version 3.0) Unchecked Buffer in SNMP Service Could Enable Arbitrary Code to be Run 7 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-2002.065 ESB-2002.070 ESB-2002.082 - --------------------------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: 06 March 2002 (Version 3.0) 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 5, 2002, Microsoft released an updated version of the bulletin annoucing the availability of a patch for Windows NT 4.0 and to advise customers that the work-around procedure is no longer needed for that platform. 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. - - - - - - - - - --------------------------------------------------------------------- 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. - -----BEGIN PGP SIGNATURE----- Version: PGP 7.1 iQEVAwUBPIbKFI0ZSRQxA/UrAQGioQgApnaHOvExOATgURFdDVAsGSgEz/u4tgf9 jCHN7h+klxPsCGNLhcP2cxOLANmosiaTTD4TdyPJ3NFQXlKV6jQmMgsHn/y/OsMk wWxW7GeEuSlVduGHjCbqeRy5en6GAbTpjMIU9o9ayeQQJJLksdRuAw1YvYh3kUWO DPdp1qPuO/MQJNYLqBitKMU0Dz06ODlrJTYPY724N35WTSZDa8drZEznGDJV2DHA Bfr5EtSlzjP8IpBUoCh/rRopjmd1+B0purSPWMTrUsTEIyzZK/ckO8RdbnV9FvdR o+sYZr90D5iJrqyaaBeh22hxZOvcFLITk4whLukDHyFRfTrrKowL4g== =kF7s - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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 iQCVAwUBPIeiyih9+71yA2DNAQEMRwP9HFo93nwq0ZIMXjQI1AxalbMWUKzyRmad BxLw8nz2yehnfBnW3jtVIyG+GIM5nMQ48SD+yY6LPpiAk8PssAHaFlJbYPMMribm qr3sD9zvVk/I/jpK7/4bkaZ7O8t66Qvjb+X58HynICZZoATGl+CJBsgkkmJhYPAD Okk4GK1F2PI= =PUWP -----END PGP SIGNATURE-----