Specialer
Author: LT 'syreal' Jones, et al. | 400 points
Description
Reception of Special has been cool to say the least. That's why we made an exclusive version of Special, called Secure Comprehensive Interface for Affecting Linux Empirically Rad, or just 'Specialer'. With Specialer, we really tried to remove the distractions from using a shell. Yes, we took out spell checker because of everybody's complaining. But we think you will be excited about our new, reduced feature set for keeping you focused on what needs it the most.
Please start an instance to test your very own copy of Specialer.
Solution
Once we log in, we can tell the shell has been 'reduced' by it's lack of commands such as ls
and cat
. However, we can access commands such as cd
and pwd
.
Also, the nice thing about actual good shells is the features.. such as autocomplete. Without realizing it, I hit Tab->Tab after typing cd
and got a list of directories. Who needs ls
?
You can also hit Tab->Tab on a blank line and get a list of all the commands!
Now we just figure out how to view the files without using cat
.
After doing some research on the echo
command, I found out you can use it to print the contents of files. So I printed one of the files!
I got kinda lucky and picked the right file, "kazam.txt" in the "ala" directory, the first try, since there are other files and directories in effort to hide the flag.
Flag
The flag is picoCTF{y0u_d0n7_4ppr3c1473_wh47_w3r3_d01ng_h3r3_38f5cc78}
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