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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/18211

Item Details

References: CSCv7|14.6

Plugin: Unix

Control ID: 402f7cc1fc731fbe9c9435d84d00aaea92fc2f6fe3cf53a75e3b554568702b3a