Title: GAMSoft Telsrv DoS Vulnerability
Severity: MODERATE
Description:
GAMSoft Telsrv telnet server is prone to a trivial denial-of-service attack. If a malicious user were to connect to port 23 and supply a username of approximately 4550 characters, the telnet application would crash. Restarting the service is required to regain normal functionality.
In some cases, Telsrv will return an error message that contains a valid username and password in plain-text format. This can be used to gain unauthorized access to the telnet server.
Affected Products:
- GAMSoft Telsrv 1.4.0
- GAMSoft Telsrv 1.5.0
References:
- GAMSoft: GAMSoft Homepage
- NTBugtraq: DoS in Gamsoft TelSrv telnet server for MS Windows 95/98/NT/2k.
- NTBugtraq: TelSrv Reveals Usernames & Passwords After DoS Attack
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