LowOS hardeningBLWK-ACCT-003

Password minimum age is zero

What this means

PASS_MIN_DAYS in /etc/login.defs is 0 — a user forced to rotate a leaked password can immediately change it right back to the old (compromised) one, defeating the point of the forced rotation.

How to fix it

Set PASS_MIN_DAYS 1 (or your organization's policy) in /etc/login.defs.

Check it yourself

Run a scan and look for BLWK-ACCT-003 in the results:

bulwark scan

Installed the standalone CLI package instead of the app? The command is bulwarkctl.

How Bulwark decides

Bulwark reads login_defs and reports this check when:

pass_min_days == 0

If a value can't be read, Bulwark reports the check as undetermined rather than passing it. View the rule source.

References

• CIS Benchmark 6.2.1

Related checks

• Cron entry runs a downloader piped to a shell · BLWK-ACCT-001
• Password maximum age is excessively long · BLWK-ACCT-002
• Password hashing rounds are not explicitly configured · BLWK-ACCT-004
• Default UMASK is not explicitly configured · BLWK-ACCT-005
• A sensitive system file is world-writable · BLWK-FS-001
• /etc/shadow is world-readable · BLWK-FS-002