Title: Microsoft Windows 2000 Telnet System Call DoS Vulnerability
Severity: MODERATE
Description:
Microsoft Windows 2000 ships with a telnet service. A vulnerability exists in the telnet service which could enable a user to terminate any telnet session.
Admininstrative privileges are required in order to access the management console of the telnet service, however a certain underlying system call does not require admin privileges.
Typically, in order to make some system calls one requires a certain level of privilege (admin), but a flaw exists which enables a normal user to make a specific system call. If this system call is properly made it is possible to terminate telnet sessions. This is achieved if a program running on the server with normal privileges initiates the system call to terminate a telnet session.
In order for a user to exploit this vulnerability, a user must log onto the server and load a program that will run the system call.
A restart of the service is required in order to regain normal functionality.
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 Advanced Server SP2
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Datacenter Server SP1
- Microsoft Windows 2000 Datacenter Server SP2
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional SP1
- Microsoft Windows 2000 Professional SP2
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server SP1
- Microsoft Windows 2000 Server SP2
References:
- Microsoft: Microsoft Security Bulletin MS01-031
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