TAMUctf 19 writeup Stop and Listen

Stop and Listen


Sometimes you just need to stop and listen.

This challenge is an introduction to our network exploit challenges, which are hosted over OpenVPN.


  • Install OpenVPN. Make sure to install the TAP driver.
  • Obtain your OpenVPN configuration in the challenge modal.
    • You will obtain a separate config for each challenge containing connection info and certificates for authentication.
  • Launch OpenVPN:
    • CLI: sudo openvpn --config ${challenge}.ovpn
    • Windows GUI: Place the config file in %HOMEPATH%\OpenVPN\config and right-click the VPN icon on the status bar, then select the config for this challenge

The virtual tap0 interface will be assigned the IP address by default. If multiple team members connect you will need to choose a unique IP for both.

The standard subnet is, so give that a scan ;)

If you have any issues, please let me (nategraf) know in the Discord chat

Some tools to get started:

"Of Life, the Universe and Everything..." said Deep Thought.
"Is..." said Deep Thought, and paused.
"gigem{f0rty_tw0_c9d950b61ea83}" said Deep Thought, with infinite majesty and calm.... 
...O Deep Thought computer," he said, "the task we have designed you to perform is this. We want you to tell us...." he paused, "The Answer."

SHA2017 CTF writeup Vod Kanockers

Vod Kanockers (100) - 148 solves

The name is Kanockers. Vod Kanockers.
<!-- *Knock Knock* 88 156 983 1287 8743 5622 9123 -->
Knock Knockからポートノッキングを疑ってみます。

$ nc 88; nc 156; nc 983; nc 1287; nc 8743; nc 5622; nc 9123

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