Title: Microsoft Windows 2000 Telnet Session Timeout DoS Vulnerability
Severity: MODERATE
Description:
The Telnet daemon shipped with Windows 2000 is susceptible to a trivial denial of service attack if an initiated session is not reset. After a certain interval of time, a telnet session will timeout if the user does not supply a username or password. The connection will not be reset until the user enters a character. If a malicious user were to connect to a Windows 2000 telnet daemon and not reset the connection, they would effectively deny any other access to the telnet server because the maximum number of client connections is 1. Any other user that attempts to connect to the telnet server during that time will receive the following error message:
Microsoft Windows Workstation allows only 1 Telnet Client License
Server has closed connection
Viewing 'List the Current Users' option will not display the timed out session because successful authorization did not take place.
Affected Products:
- 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 Datacenter Server
- Microsoft Windows 2000 Datacenter Server SP1
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional SP1
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server SP1
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