Challenge Name: Where are the robots
Points: 100
Category: Web Exploitation

Hello Everyone,

I hope you are doing well.

Please note that, this CTF competition is over so I have rights to post the writeup publicly according to the policy.

I hope that you have tried all the possible ways to solve the challenge and you are here because you have still not found the solution.

Flag Format: picoCTF{FLAG}

Challenge Details:

Hints: What part of the website could tell you where the creator doesn’t want you to look?


From the challenge name itself we are getting hint that we need to look into robots.txt file.

So, visit

and append the URL with robots.txt

Now the final URL becomes,

Here, we can see

User-agent: *
Disallow: /477ce.html

Now append /477ce.html to our first URL.

So the URL looks something like this.

after visiting this URL, you’ll get the flag.

Flag: picoCTF{ca1cu1at1ng_Mach1n3s_477ce}

I hope that you have enjoyed the writeup and learned something new today, Please let me know if there are any concerns.

Thank You

Categories: picoCTF


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