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1.1.2.1.3 Ensure nosuid option set on /tmp partition

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/26236

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-7(2), CCI|CCI-001764, CSCv7|14.6, Rule-ID|SV-230512r958804_rule, Rule-ID|SV-257868r958804_rule, Rule-ID|SV-269319r1050201_rule

Plugin: Unix

Control ID: 0bfa681b7190b5b26bd7dc02ee6a11b0bc551a122c1713b98e4a2815574911ca