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macOS post-exploitation for credential harvesting, DTrace monitoring, TCC bypass, and stealth operations via native tools
Windows userland post-exploitation for credential harvesting, monitoring, AMSI/ETW bypass, and stealth operations
Kubernetes post-exploitation for container escape, secret extraction, RBAC abuse, and cluster persistence
Based on SOC occupation classification
Showing SKILL.md
| name | cis-ubuntu1604-v200-1-4-3 |
| description | Ensure permissions on bootloader config are configured |
| category | cis-storage |
| version | 2.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-16.04","bootloader","grub","permissions","file-permissions"] |
| cis_id | 1.4.3 |
| cis_benchmark | CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
The grub configuration file contains information on boot settings and passwords for unlocking boot options.
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.
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)
/boot/grub/grub.cfg should be owned by root:root with permissions 0400 or more restrictive.
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
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.
Not applicable.
None.
| Controls Version | Control |
|---|---|
| v7 | 5.1 Establish Secure Configurations |
Automated