April 13, 2004
A denial of service vulnerability has been reported in Microsoft Windows 2000 Server systems that are acting as Domain Controllers.
This issue may be triggered by sending a malformed LDAP query to an affected Windows 2000 Domain Controller. This will cause a reboot in the Domain Controller and may be exploited repeatedly to cause a persistent denial of service.
- Avaya DefinityOne Media Servers
- Avaya IP600 Media Servers
- Avaya S3400 Message Application Server
- Avaya S8100 Media Servers
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Advanced Server SP1
- Microsoft Windows 2000 Advanced Server SP2
- Microsoft Windows 2000 Advanced Server SP3
- Microsoft Windows 2000 Advanced Server SP4
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Datacenter Server SP1
- Microsoft Windows 2000 Datacenter Server SP2
- Microsoft Windows 2000 Datacenter Server SP3
- Microsoft Windows 2000 Datacenter Server SP4
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional SP1
- Microsoft Windows 2000 Professional SP2
- Microsoft Windows 2000 Professional SP3
- Microsoft Windows 2000 Professional SP4
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server SP1
- Microsoft Windows 2000 Server SP2
- Microsoft Windows 2000 Server SP3
- Microsoft Windows 2000 Server SP4
Block external access at the network boundary, unless external parties require service.
Use multiple layers of network access control to regulate external or untrusted network traffic. This will help to limit exposure to exploitation of this and other latent vulnerabilities. This includes blocking inbound connections to TCP ports 389, 636, 3368 and 3369.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy network intrusion detection systems to monitor network traffic for anomalous or suspicious activity. This may help in detecting attack attempts or activity that is the result of successful exploitation of this or other latent vulnerabilities.
Avaya has released an advisory to announce that Avaya System Products shipping on Microsoft platforms are also affected by this vulnerability. Avaya advise that customers follow the Microsoft recommendations for the resolution of this issue. The aforementioned advisory can be viewed at the following location:
Microsoft has released fixes to address this issue.
US-CERT has released an advisory TA04-104A to address this and other issues. Please see the referenced advisory for more information.
Discovery is credited to Carlos Sarraute of Core Security Technologies.
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