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1.1.3 Ensure noexec option set on /tmp partition

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Information

The noexec mount option specifies that the filesystem cannot contain executable binaries.

Since the /tmp filesystem is only intended for temporary file storage, set this option to ensure that users cannot run executable binaries from /tmp.

Solution

Edit the /etc/fstab file OR the /etc/systemd/system/local-fs.target.wants/tmp.mount file:

IF /etc/fstab is used to mount /tmp

Edit the /etc/fstab file and add noexec to the fourth field (mounting options) for the /tmp partition. See the fstab(5) manual page for more information.

Run the following command to remount /tmp :

# mount -o remount,noexec /tmp

OR if systemd is used to mount /tmp :_

Edit /etc/systemd/system/local-fs.target.wants/tmp.mount to add noexec to the /tmp mount options:

[Mount]
Options=mode=1777,strictatime,noexec,nodev,nosuid

Run the following command to restart the systemd daemon:

# systemctl daemon-reload

Run the following command to restart tmp.mount

# systemctl restart tmp.mount

See Also

https://workbench.cisecurity.org/benchmarks/8415

Item Details

References: CSCv7|2.6

Plugin: Unix

Control ID: 6a5aef328870f1637df5cde4b48ec364de5e5d8b24b6a71af084991f75d7329a