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on the input() challenge, I know that i can inject the code to retrieve the password, but i do not understand how to change to change the permissions on the file using python or the sys module. I see the vulnerability of the input function itself, but I can not quite figure out how to escalate my privileges to be able to open the file.

any help?

"ls" command should help you ;)

solved it! thanks

Can you give me more hints please !!

Hello,
The main hint is on the title "python input()", it means that you should look for vulnerability relative to the input function.
Good Luck