picoCTF 2019 plumbing Writeup

plumbing is a General Skills puzzle worth 200 points

Description

Sometimes you need to handle process data outside of a file. Can you find a way to keep the output from this program and search for the flag? Connect to jupiter.challenges.picoctf.org 4427.

Solution

Connecting to this service with netcat shows 10000 lines of output:

daniel@wildcat ~ % nc jupiter.challenges.picoctf.org 4427 |wc -l
10001

Since I knew the format of the flags is picoCTF{}, I piped the output from netcat into grep, searching for this pattern.

picoCTF 2019 plumbing writeup.

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