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1.1.2.5.3 Ensure nosuid option set on /var/tmp partition

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Information

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

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

Solution

- IF - a separate partition exists for /var/tmp.

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

Example:

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

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

# mount -o remount /var/tmp

See Also

https://workbench.cisecurity.org/benchmarks/18209

Item Details

References: CSCv7|14.6

Plugin: Unix

Control ID: 5635adaf6f6f251f74a7dbab552a18614abc4a17ff57bcd453154c673de8e1b1