Title

Users must not be able to change passwords more than once every 24 hours. (Cat II impact)

Discussion

The ability to change passwords frequently facilitates users reusing the same password. This can result in users effectively never changing their passwords. This would be accomplished by users changing their passwords when required and then immediately changing it to the original value.

Check Content

Check the minimum time period between password changes for each user account is 1 day or greater. # awk -F: '$4 < 1 {print $1}' /etc/shadow If any results are returned that are not associated with a system account, this is a finding.

Fix Text

Edit the /etc/default/passwd file and set the variable "MINWEEKS" to 1 or greater. Set the per-user minimum password change times by using the following command on each user account. # passwd -n <number of days> <accountname>

Additional Identifiers

Rule ID: SV-227581r603266_rule

Vulnerability ID: V-227581

Group Title: SRG-OS-000075

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.