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

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-000198

SV-38768r1_rule Users must not be able to change passwords more than once every 24 hours.

Vulnerability 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 minage field for each user. # /usr/sbin/lsuser -a minage ALL If the minage field is less than 1 for any user, this is a finding.

Fix text

Use SMIT or the chsec command to set the minimum password age to 1 week. # chsec -f /etc/security/user -s default -a minage=1 # chsec -f /etc/security/user -s -a minage=1 OR # smitty chuser

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