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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-v200-1-4-1 |
| description | Ensure permissions on bootloader config are not overridden |
| category | cis-storage |
| version | 2.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-16.04","bootloader","grub","permissions","secure-boot"] |
| cis_id | 1.4.1 |
| cis_benchmark | CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
The permissions on /boot/grub/grub.cfg are changed to 444 when grub.cfg is updated by the update-grub command.
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 the output:
grep -E '^\s*chmod\s+[0-7][0-7][0-7]\s+\$\{grub_cfg\}\.new' -A 1 -B1 /usr/sbin/grub-mkconfig
Verify the output is:
if [ "x${grub_cfg}" != "x" ]; then
chmod 400 ${grub_cfg}.new || true
fi
The chmod command in /usr/sbin/grub-mkconfig should use 400 (not 444) for ${grub_cfg}.new.
Run the following command to update chmod 444 to chmod 400 in /usr/sbin/grub-mkconfig:
sed -ri 's/chmod\s+[0-7][0-7][0-7]\s+\$\{grub_cfg\}\.new/chmod 400 ${grub_cfg}.new/' /usr/sbin/grub-mkconfig
Run the following command to remove check on password not being set to before running chmod command:
sed -ri 's/ && ! grep "\^password" \$\{grub_cfg\}.new >\/dev\/null//' /usr/sbin/grub-mkconfig
if [ "x${grub_cfg}" != "x" ] && ! grep "^password" ${grub_cfg}.new >/dev/null; then
chmod 444 ${grub_cfg}.new || true
fi
None.
| Controls Version | Control |
|---|---|
| v7 | 14.6 Protect Information through Access Control Lists |
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