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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
Basado en la clasificación ocupacional SOC
Mostrando SKILL.md
| name | cis-ubuntu2004-v300-1-4-2 |
| description | Ensure access to bootloader config is configured |
| category | cis-storage |
| version | 3.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-20.04","bootloader","grub","permissions"] |
| cis_id | 1.4.2 |
| cis_benchmark | CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 |
| 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 0600 or more restrictive:
# stat -Lc 'Access: (%#a/%A) Uid: ( %u/ %U) Gid: ( %g/ %G)' /boot/grub/grub.cfg
Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root)
Access should be 0600 or more restrictive, Uid and Gid should both be 0/root.
Run the following commands to set permissions on your grub configuration:
# chown root:root /boot/grub/grub.cfg
# chmod u-x,go-rwx /boot/grub/grub.cfg
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
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.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 3.3 Configure Data Access Control Lists | * | * | * |
| v7 | 14.6 Protect Information through Access Control Lists | * | * | * |
MITRE ATT&CK Mappings: T1542, T1542.000 | TA0005, TA0007 | M1022