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Steam Locomotive

easy | Miscellaneous | 50 points

Description

I keep accidentally mistyping the ls command!

Solution

I kind of freaked out when I got the solution, as I didn't expect the solution to be this simple.

The challenge provides an ssh server to log into. Logging into the server shows this

# password is userpass
ssh -p 31862 user@challenge.nahamcon.com

A train moving across the screen. I tried typing stuff for a long time, nothing happens. I even managed to stop the train, still nothing.

Then suddenly, I happened to try something:

$ echo "ls" | ssh -p 31862 user@challenge.nahamcon.com
Pseudo-terminal will not be allocated because stdin is not a terminal.
user@challenge.nahamcon.com's password: 
flag.txt

WHAT?!?!??! THIS ACTUALLY WORKED???? *confused happiness*

After a mini-celebration, I tried this:

$ echo "cat flag.txt" | ssh -p 31862 user@challenge.nahamcon.com
Pseudo-terminal will not be allocated because stdin is not a terminal.
user@challenge.nahamcon.com's password: 
flag{4f9b10a81141c7a07a494c28bd91d05b}

I'm speechless *mind blown*

PS: The correct way to send in the command is ssh -p 31862 user@challenge.nahamcon.com <command> but I didn't know this at the time. Now I know and you do too!

Flag: flag{4f9b10a81141c7a07a494c28bd91d05b}