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Showing SKILL.md
Based on SOC occupation classification
| name | cis-ubuntu1604-v200-5-5-1-2 |
| description | Ensure password expiration is 365 days or less |
| category | cis-iam |
| version | 2.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-16.04","authentication","pam"] |
| cis_id | 5.5.1.2 |
| cis_benchmark | CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Profile Applicability:
Assessment Status: Automated
The PASS_MAX_DAYS parameter in /etc/login.defs allows an administrator to force passwords to expire once they reach a defined age.
The window of opportunity for an attacker to leverage compromised credentials or successfully compromise credentials via an online brute force attack is limited by the age of the password. Therefore, reducing the maximum age of a password also reduces an attacker's window of opportunity. It is recommended that the PASS_MAX_DAYS parameter does not exceed 365 days and is greater than the value of PASS_MIN_DAYS.
Run the following command and verify PASS_MAX_DAYS conforms to site policy, does not exceed 365 days, and is greater than PASS_MIN_DAYS:
grep PASS_MAX_DAYS /etc/login.defs
Expected output:
PASS_MAX_DAYS 365
Run the following command and Review list of users and PASS_MAX_DAYS to verify that all users' PASS_MAX_DAYS conforms to site policy, does not exceed 365 days, and is no less than PASS_MIN_DAYS:
awk -F: '(/^[^:]+:[^!*]/ && ($5>365 || $5~/([0-1]|-1|\s*)/)){print $1 " " $5}' /etc/shadow
Expected Result:
No <user>:<PASS_MAX_DAYS> should be returned.
Set the PASS_MAX_DAYS parameter to conform to site policy in /etc/login.defs:
PASS_MAX_DAYS 365
Modify user parameters for all users with a password set to match:
chage --maxdays 365 <user>
PASS_MAX_DAYS 99999
A value of -1 will disable password expiration.
The password expiration must be greater than the minimum days between password changes or users will be unable to change their password.
| Controls Version | Control |
|---|---|
| v7 | 4.4 Use Unique Passwords - Where multi-factor authentication is not supported (such as local administrator, root, or service accounts), accounts will use passwords that are unique to that system. |