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We are given a site where we can check the status of websites.
Entering a valid URL such as https://google.com will return us the HTTP status code as seen in the following screenshot.
Entering a semi-colon (;) will break the command. We can try to use the payload ; whoami and we are returned www-data as our user as seen in the following screenshot.
We can attempt to use the command sudo -l. We can see that we are able to run any command as sudo without a password as seen in the followings screenshot.
We can attempt to use the command sudo ls /root/ to list the root directory. We can see that there is a file called flag.txt as seen in the following screenshot.
We can read the contents of the file by using the command cat /roo/flag.txt. The flag is: ````