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[Retired] CTF [Oct 1-5]

weekly-ctf-all | Level: Intermediate  | Total Lab Runs: 0 | Premium Lab

Lab Scoreboard

Lab Walkthrough Video:

This CTF contest has concluded. The solution video is provided above for your reference.

Welcome! This is an intermediate level CTF challenge so should be easy :-) 

[README] Simple Rules: 

  • Once you verify the flags, please email with a short report on the process and your email used on this website.
  • Reply to our Twitter or LinkedIn post letting us know you've submitted your report
  • All decisions from our team will be final 
  • CTF will run between October 1-5th 2020
  • The first 3 correct submissions will get a 30-day subscription to PentesterAcademy
  • An additional 3 correct submissions will also get a 30-day subscription to PentesterAcademy. These will be picked randomly from the remaining correct submissions coming in till October 5th, 10 PM EST. 
  • Winners will be contacted October 6-7th 2020

CTF Description: 

Allowing anonymous users to run commands on a system is never a good idea, if it comes to it, a whitelist should be used and the developer should make sure that the user can only execute the commands mentioned in the whitelist. This is one such case, however, while developing the application, the developer made a mistake due to which arbitrary command execution was possible on the system.

Objective: Collect all three flags!

[README] Instructions to access the lab: 
  • This lab is dedicated to you! No other users are on this network :) 
  • Once you start the lab, you will have access to a Kali GUI instance. This machine has an interface with IP address 192.X.Y.2. 
  • The target server should be located at the IP address 192.X.Y.3
  • The target server has 3 user accounts of interest: root, www-data, and admin
  • Do not attack the gateway located at IP address 192.X.Y.1 
  • You can use all tools installed in Kali to complete this lab
  • We have also installed additional tools under the folder /root/tools. These might come in handy during this or other CTFs on AttackDefense.


  • This lab has 3 Flags to be collected
  • The Flags can be identified by the strings: FLAG1, FLAG2, FLAG3
  • The above Flag labels will be part of filenames on the target system 

1. FLAG1
2. FLAG2
3. FLAG3

The following activities are strictly prohibited on this website unless otherwise explicitly stated as allowed in the mission statement:

  • Using automated scanners
  • Using brute force attacks
  • Denial of Service attacks
  • Attacking other student machines in challenges where you might achieve a shell on the vulnerable system
  • Attacking the lab infrastructure

Users violating the above will be either temporarily or permanently banned from the website. 

If you are unsure about an activity, then please contact support to confirm that it is allowed on our website.

Technical Support for this Lab:

There is a reason we provide unlimited lab time: you can take as much time as you need to solve a lab. However, we realize that sometimes hints might be necessary to keep you motivated!

We currently provide technical support limited to:

  • Giving hints for a lab exercise
  • In rare circumstances, if you have totally given up (NO!!!) then tell you how to solve it. This will be limited to sharing the solution video or lab report
  • A lab exercise fails to load or has errors in it

If you need technical support, please email  clearly mention the name and link of the lab exercise and other essential details. The more descriptive you are, the faster we can help you. We will get back to you within 24 hours or less. 

For adminitrative queries, billing, enterprise accounts etc. please email