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1.1.2.1.3 Ensure nosuid option set on /tmp partition

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Information

The nosuid mount option specifies that the filesystem cannot contain setuid files.

Since the /tmp filesystem is only intended for temporary file storage, set this option to ensure that users cannot create setuid files in /tmp.

Solution

- IF - a separate partition exists for /tmp.

Edit the /etc/fstab file and add nosuid to the fourth field (mounting options) for the /tmp partition.

Example:

 <device> /tmp <fstype> defaults,rw,nosuid,nodev,noexec,relatime 0 0

Run the following command to remount /tmp with the configured options:

 # mount -o remount /tmp

See Also

https://workbench.cisecurity.org/benchmarks/18959

Item Details

References: CSCv7|14.6

Plugin: Unix

Control ID: 92b9a433d0618ac3d4949bbca69f62817289f7d99078839c3e72f859fe4aff6d