DefendTheWeb.net, previously called HackThis.co.uk, is a very famous and well-known interactive security platform where you can learn and challenge your skills.. It contains challenges from several different cybersecurity fields.
I’ve decided to have a bit of fun and try to solve every single challenge presented, from the easiest to the hardest. (although easy and hard will be different depending on your skillset and field of expertise).
As I do with any challenge website, I WILL NEVER post the flag in cleartext, as it kills the fun and thrill of finding it, however I will post my way (or ways) of getting there. This is done in respect of the website’s security and non-disclosure policy, even when it doesn’t have one ;).
Challenge Sid / Intro
This challenge is rated as Intro, so it might be easy to solve. This time the author only gives us a button with “[ Enter site ]” in it. Clicking that link we receive the error message “Invalid Cookie”, so I guess we have to do something with the cookie to get us through it.
Using our beloved Google Chrome Dev Tools (F12) and going to the “Application” tab, we can see that we have a few cookies set:

One of them caught my eye, “i3_access” which looks like the cookie that controls the access to the website. Simply change the content from “false” to “true” and click the “[ Enter site ]” button again, and there you have it.
See you on the next challenge.