Users must not be able to change passwords more than once every 24 hours.

From Red Hat Enterprise Linux 6 Security Technical Implementation Guide

Associated with: CCI-000198

SV-50277r1_rule Users must not be able to change passwords more than once every 24 hours.

Vulnerability discussion

Setting the minimum password age protects against users cycling back to a favorite password after satisfying the password reuse requirement.

Check content

To check the minimum password age, run the command: $ grep PASS_MIN_DAYS /etc/login.defs The DoD requirement is 1. If it is not set to the required value, this is a finding.

Fix text

To specify password minimum age for new accounts, edit the file "/etc/login.defs" and add or correct the following line, replacing [DAYS] appropriately: PASS_MIN_DAYS [DAYS] A value of 1 day is considered sufficient for many environments. The DoD requirement is 1.

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