How to secure /tmp and /var/tmp

Secure /tmp

  1. Edit /etc/fstab by typing the command nano -w /etc/fstab
  2. Paste the following at the bottom of /etc/stab that you just opened: none /tmp tmpfs nodev,nosuid,noexec 0 0
  3. Press ctrl + x to close the file, press y to save it.
  4. Remount /tmp by typing the following then press enter: mount -o remount /tmp
  5. You can verify that /tmp is correctly mounted by typing df -h and you should see something similar to the following: none          3.9G   0  3.9MG   0% /tmp.

Secure /var/tmp

  1. Backup /var/tmp by typing the following: mv /var/tmp /var/tmpbackup
  2. Make a symbolic link that makes /var/tmp point to /tmp by typing the following: ln -s /tmp /var/tmp
  3. Copy back the old data using the command: cp /var/tmpbackup/* /tmp/
  4. Remove the un-needed backup you created: rm -rf /var/tmpbackup

You should now reboot your VPS. This means /tmp and /var/tmp are now secured.

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