Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
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Linux-Proc Memory. Peeking at a Process's Environment
Mission
A daemon process runs continuously in the background, with the flag set as one of its environment variables. Investigate the process using the /proc filesystem.
Hints
Hint 1 Show
Use ps aux to find the process ID from the process list
Hint 2 Show
/proc/<pid>/environ contains the raw environment variable data
Hint 3 Show
Format it for readability with strings or tr: tr \0 \n < /proc/<pid>/environ