in out error

in out error

Points: 275

Category

General Skills

Question

Can you utlize stdin, stdout, and stderr to get the flag from this program? You can also find it in /problems/in-out-error_2_c33e2a987fbd0f75e78481b14bfd15f4 on the shell server

Hint

Maybe you can split the stdout and stderr output?

Solution

Upon running the file in the web shell, we get Rick Roll'd which is mashed up together with the flag.

The flag is printed as stderr, while the lyrics are printed as stdout

Redirect all stdout into /dev/null to only show the flag.

$ ./in-out-error 1> /dev/null
Please may I have the flag?
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Flag

picoCTF{p1p1ng_1S_4_7h1ng_b6f5a788}