BSides Boston 2020: EZ Bake Oven

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Challenge

Prompt:

We are given a webpage that looks like this:

If we select any option on the left, the timer begins to count down. Of notable interest is the Magic Cookie , however it would take 7200 minutes for the timer to complete.

When we do place something in the oven, a cookie is set:

Looks like base64

So let’s go ahead and write our own cookie and base64 encode it. I changed the date on the cookie to several weeks prior to the current date. I went back to the webpage and set this as the cookie value and got the flag: