Windows NT Server Message Block NULL Session Connection Red Button Vulnerability
Threat Type:
IntelliShield: Security Activity Bulletin
IntelliShield ID:
1144
Version:
1
First Published:
2000 May 01 16:00 GMT
Last Published:
2000 May 01 16:00 GMT
Port:
135
,
137
,
138
,
139
Urgency:
Unlikely Use
Credibility:
Highly Credible
Severity:
Mild Damage
Version Summary:
Windows NT contains a vulnerability that could allow an unauthenticated, remote attacker to establish a NULL session connection. This connection could allow the attacker to read registry information and enumerate shares anonymously.
Description
Windows NT contains a vulnerability that could allow an unauthenticated, remote attacker to establish a NULL session connection. This connection could allow the attacker to read registry information and enumerate shares anonymously.
This vulnerability is named after a widely distributed exploit program, which featured a large red button to activate the exploit.
Administrators are advised to install Microsoft Windows NT 4.0 Service Pack 3 or the Windows NT 3.51 hotfix, additional information is available from Microsoft.
Administrators are advised to permit only authenticated users to list account names and to exclude anonymous connections from doing so. The following registry change will provide these limitations:
Edit the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\LSA
Choose Add Value from the Edit menu and input this entry: Value Name: RestrictAnonymous Data Type: REG_DWORD
Change the value to 1
Signatures
Cisco Systems Cisco Intrusion Prevention System (IPS) 6.0
The security vulnerability applies to the following combinations of products.
Primary Products:
N/A
Associated Products:
IntelliShield
Security Activity Bulletin
Original Release Base
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LEGAL DISCLAIMER The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
