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Privilege escalation : Is this step really necessary?

This is by default disabled in linux for SUID or SGID binaries because of security concern. While executing SUID or SGID bit set binaries, both the LD_PRELOAD and LD_LIBRARY_PATH environmental ...
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Sudo "/usr/sbin/halt", "/usr/sbin/reboot", "/usr/sbin/poweroff" - how to leverage it to privilege escalation?

The answer can be simple. Just like how you're doing privilege escalation by using cronjobs. You find a writable file and put your payload in then wait. sudo -l gives "/usr/sbin/halt", "...

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