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1.1.2.1.2 Ensure nosuid option set on /tmp partition

Information

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

WARNING This option is worthless if a publicly available suid or sgid wrapper is installed on your system. It is set automatically when the user does not have super-user privileges.

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 without the type tmpfs.

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

Example:

<device> /tmp <fstype> rw,nosuid,noexec 0 0

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

# mount -u -o nosuid /tmp

See Also

https://workbench.cisecurity.org/benchmarks/19044

Item Details

Category: ACCESS CONTROL, MEDIA PROTECTION

References: 800-53|AC-3, 800-53|AC-5, 800-53|AC-6, 800-53|MP-2, CSCv7|14.6

Plugin: Unix

Control ID: e8ef857ea645246db8462900f844b793bb2d77d8ed64651a31179c5ebe831887