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You have a shell on a UNIX system with a non privileged account. What kind of attack could lead you to obtain root privileges?
Shellshock
Buffer overflow on `telnet` command
Buffer overflow on `passwd` command
Fork bomb
passwd is a Setuid program, so it runs as root even if it's executed by another user. So a buffer overflow could allow the arbitrary code execution (e.g. forking a shell) in a root process.
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