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Showing SKILL.md
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
| name | cis-gcp-cos-2.1.4 |
| description | Ensure rsync service is not enabled |
| category | cis-gcp-cos |
| version | 1.2.0 |
| author | cyberstrike-official |
| tags | ["cis","gcp","container-optimized-os","rsync","services"] |
| cis_id | 2.1.4 |
| cis_benchmark | CIS Google Container-Optimized OS Benchmark v1.2.0 |
| tech_stack | ["gcp","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
The rsyncd service can be used to synchronize files between systems over network links.
The rsyncd service presents a security risk as it uses unencrypted protocols for communication.
Run the following command to verify rsyncd is not enabled:
# systemctl is-enabled rsyncd
disabled
Verify result is not "enabled".
The command should return disabled, confirming that the rsync service is not enabled.
Run the following command to disable rsyncd:
# systemctl --now disable rsyncd
/etc is stateless on Container-Optimized OS. Therefore, the steps mentioned above needs to be performed after every boot.
Additional Information:
Additional methods of disabling a service exist. Consult your distribution documentation for appropriate methods.
On some distributions the rsync service is known as rsync, not rsyncd.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 4.4 Implement and Manage a Firewall on Servers - Implement and manage a firewall on servers, where supported. Example implementations include a virtual firewall, operating system firewall, or a third-party firewall agent. | X | X | X |
| v8 | 4.5 Implement and Manage a Firewall on End-User Devices - Implement and manage a host-based firewall or port-filtering tool on end-user devices, with a default-deny rule that drops all traffic except those services and ports that are explicitly allowed. | X | X | X |
| v8 | 4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software - Uninstall or disable unnecessary services on enterprise assets and software, such as an unused file sharing service, web application module, or service function. | X |
| X |
| v7 | 9.2 Ensure Only Approved Ports, Protocols and Services Are Running - Ensure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system. | X | X |