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Showing SKILL.md
| name | cis-gcp-cos-6.1.6 |
| description | Ensure permissions on /etc/shadow- are configured |
| category | cis-gcp-cos |
| version | 1.2.0 |
| author | cyberstrike-official |
| tags | ["cis","gcp","container-optimized-os","file-permissions","shadow","system-files"] |
| cis_id | 6.1.6 |
| cis_benchmark | CIS Google Container-Optimized OS Benchmark v1.2.0 |
| tech_stack | ["gcp","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
The /etc/shadow- file is used to store backup information about user accounts that is critical to the security of those accounts, such as the hashed password and other security information.
It is critical to ensure that the /etc/shadow- file is protected from unauthorized access. Although it is protected by default, the file permissions could be changed either inadvertently or through malicious actions.
Run the following command and verify verify Uid is 0/root, Gid is 0/root or <gid>/shadow, and Access is 640 or more restrictive:
# stat /etc/shadow-
Access: (0640/-rw-r-----) Uid: ( 0/ root) Gid: ( 0/ root)
Uid should be 0/root, Gid should be 0/root or <gid>/shadow, and Access should be 640 or more restrictive.
Run the one of the following chown commands as appropriate and the chmod to set permissions on /etc/shadow-:
# chown root:root /etc/shadow-
# chown root:shadow /etc/shadow-
# chmod o-rwx,g-rw /etc/shadow-
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 3.3 Configure Data Access Control Lists | x | x | x |
| v7 | 16.4 Encrypt or Hash all Authentication Credentials | 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
