Microsoft Windows NT/2000 NetBIOS Name Server spoofed name conflict
| netbios-name-server-spoofing (5035) |  Low Risk |
Description:
The NetBIOS Name Server (NBNS) protocol in Windows NT and 2000 allows network peers to assist in managing name conflicts. The NBNS protocol is vulnerable to a denial of service attack. A remote attacker can send a spoofed NetBIOS Name Conflict message to the NetBIOS name service that would cause the system to release its name on the network. This prevents other computers on the network from requesting services from the system.
A tool called NBName, originally discussed at the DefCon conference, exploits this vulnerability.
Platforms Affected:
- Microsoft, Windows 2000
- Microsoft, Windows NT 4.0
Remedy:
Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS01-044, or MS02-001, or MS02-018. See References.
For Windows NT Server 4.0, Terminal Server Edition:
Microsoft originally provided a patch for this vulnerability in MS00-047, but it has been superseded by the patch released with MS01-033, which has been superseded by the patch released with MS02-018. See References.
For Windows NT 4.0:
Microsoft originally provided patches for this vulnerability in MS00-047, MS01-033, MS01-041, and MS02-001, but they have been superseded by the patch released with MS02-018. See References.
For IIS:
Microsoft originally provided a patch for this vulnerability in MS01-033, but it has been superseded by the patch released with MS01-044 and 02-018, and then superseded by the patch released with MS03-018. See References.
For Windows 2000:
Microsoft originally provided a patch for this vulnerability in MS01-033, but it has been superseded by the patch released with MS02-001. See References.
Consequences:
Denial of Service
References:
- Microsoft Knowledge Base Article 269239, NetBIOS Vulnerability May Cause Duplicate Name on the Network Conflicts at http://support.microsoft.com/default.aspx?scid=kb;[LN];269239.
- Microsoft Security Bulletin MS00-047, Patch Available for 'NetBIOS Name Server Protocol Spoofing' at http://www.microsoft.com/technet/security/bulletin/ms00-047.mspx.
- Microsoft Security Bulletin MS00-047 FAQ, Microsoft Security Bulletin (MS00-047): Frequently Asked Questions at http://www.microsoft.com/technet/security/bulletin/fq00-047.mspx.
- Microsoft Security Bulletin MS01-033, Unchecked Buffer in Index Server ISAPI Extension Could Enable Web Server Compromise at http://www.microsoft.com/technet/security/bulletin/ms01-033.mspx.
- Microsoft Security Bulletin MS01-041, Malformed RPC Request Can Cause Service Failure at http://www.microsoft.com/technet/security/bulletin/ms01-041.mspx.
- Microsoft Security Bulletin MS01-044, 15 August 2001 Cumulative Patch for IIS at http://www.microsoft.com/technet/security/bulletin/ms01-044.mspx.
- Microsoft Security Bulletin MS02-001, Trusting Domains Do Not Verify Domain Membership of SIDs in Authorization Data at http://www.microsoft.com/technet/security/bulletin/ms02-001.mspx.
- Microsoft Security Bulletin MS02-018, Cumulative Patch for Internet Information Services (Q319733) at http://www.microsoft.com/technet/security/bulletin/ms02-018.mspx.
- Microsoft Security Bulletin MS03-018, Cumulative Patch for Internet Information Service (811114) at http://www.microsoft.com/technet/security/bulletin/ms03-018.mspx.
- Network Associates, Inc. COVERT Labs Security Advisory COVERT-2000-09, July 27, 2000, Windows NetBIOS Name Conflicts at http://packetstormsecurity.nl/advisories/nai/COVERT-2000-09.netbios. (From Packet Storm archive)
- New Hack City Web site, Nbname at http://pr0n.newhackcity.net/~sd/nbname.html.
- BID-1514: Microsoft Windows NT/2000 NetBIOS Name Conflict Vulnerability
- BID-1515: Microsoft Windows NT/2000 NetBIOS Release Vulnerability
- CVE-2000-0673: The NetBIOS Name Server (NBNS) protocol does not perform authentication, which allows remote attackers to cause a denial of service by sending a spoofed Name Conflict or Name Release datagram, aka the NetBIOS Name Server Protocol Spoofing vulnerability.
- US-CERT VU#32650: Denial of Service Attack in NetBIOS Services
Reported:
Jul 27, 2000
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