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Showing SKILL.md
| name | cis-gcp-cos-4.1.2.1 |
| description | Ensure journald is configured to compress large log files |
| category | cis-gcp-cos |
| version | 1.2.0 |
| author | cyberstrike-official |
| tags | ["cis","gcp","container-optimized-os","logging","journald","log-files"] |
| cis_id | 4.1.2.1 |
| cis_benchmark | CIS Google Container-Optimized OS Benchmark v1.2.0 |
| tech_stack | ["gcp","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
The journald system includes the capability of compressing overly large files to avoid filling up the system with logs or making the logs unmanageably large.
Uncompressed large files may unexpectedly fill a filesystem leading to resource unavailability. Compressing logs prior to write can prevent sudden, unexpected filesystem impacts.
Review /etc/systemd/journald.conf and verify that large files will be compressed:
# grep -e Compress /etc/systemd/journald.conf
# Compress=yes
The output should show Compress=yes.
Edit the /etc/systemd/journald.conf file and add the following line:
Compress=yes
Reload the configuration to be effective.
# systemctl force-reload systemd-journald
/etc is stateless on Container-Optimized OS. Therefore, /etc cannot be used to make these changes persistent across reboots. The steps mentioned above needs to be performed after every boot.
The main configuration file /etc/systemd/journald.conf is read before any of the custom *.conf files. If there are custom configs present, they override the main configuration parameters.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 8.3 Ensure Adequate Audit Log Storage - Ensure that logging destinations maintain adequate storage to comply with the enterprise's audit log management process. | x | x | x |
| v7 | 6.4 Ensure adequate storage for logs - Ensure that all systems that store logs have adequate storage space for the logs generated. | x | x |
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
