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cis-ubuntu1204-v110-10-1-3

DevOps & Security
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Set Password Expiring Warning Days

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_12.04_LTS_Server_Benchmark_v1.1.0/cis-ubuntu1204-v110-10-1-3/SKILL.md

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10.1.3 Set Password Expiring Warning Days (Scored)

Profile Applicability

  • Level 1

Description

The PASS_WARN_AGE parameter in /etc/login.defs allows an administrator to notify users that their password will expire in a defined number of days. It is recommended that the PASS_WARN_AGE parameter be set to 7 or more days.

Rationale

Providing an advance warning that a password will be expiring gives users time to think of a secure password. Users caught unaware may choose a simple password or write it down where it may be discovered.

Audit Procedure

Using Command Line

grep PASS_WARN_AGE /etc/login.defs
# Expected output: PASS_WARN_AGE 7

chage --list <user>
# Verify: Number of days of warning before password expires: 7

Expected Result

PASS_WARN_AGE is set to 7 or more in /etc/login.defs, and all active users have a password warning age of 7 days or more.

Remediation

Using Command Line

Set the PASS_WARN_AGE parameter to 7 in /etc/login.defs:

# Edit /etc/login.defs and set:
PASS_WARN_AGE 7

# Modify active user parameters to match:
chage --warndays 7 <user>

Default Value

PASS_WARN_AGE 7

References

  • CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

Profile

Level 1 - Scored