cyberstrikeus CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - 1.4.3
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Description
The grub configuration file contains information on boot settings and passwords for unlocking boot options.
Rationale
Setting the permissions to read and write for root only prevents non-root users from seeing the boot parameters or changing them. Non-root users who read the boot parameters may be able to identify weaknesses in security upon boot and be able to exploit them.
Audit Procedure
Command Line
Run the following command and verify Uid and Gid are both 0/root and Access is 0400 or more restrictive:
stat /boot/grub/grub.cfg
Expected output:
Access: (0400/-r--------) Uid: ( 0/ root) Gid: ( 0/ root)
Expected Result
/boot/grub/grub.cfg should be owned by root:root with permissions 0400 or more restrictive.
Remediation
Command Line
Run the following commands to set permissions on your grub configuration:
chown root:root /boot/grub/grub.cfg
chmod u-wx,go-rwx /boot/grub/grub.cfg
Additional Information
This recommendation is designed around the grub bootloader, if LILO or another bootloader is in use in your environment enact equivalent settings.
Replace /boot/grub/grub.cfg with the appropriate grub configuration file for your environment.
Default Value
Not applicable.
References
None.
CIS Controls
| Controls Version | Control |
|---|---|
| v7 | 5.1 Establish Secure Configurations |
Assessment Status
Automated