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

From HP-UX 11.31 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000198

SV-38199r2_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

For Trusted Mode: Check the “u_minchg” attribute in the users TS database entry. Individual user: # export PATH=$PATH:/usr/lbin # getprpw -r -m mintm All users: # logins -o -x | awk -F: '{print $1” “$10}' If the value is less than 1 for any user, this is a finding. For SMSE: Check the PASSWORD_MINDAYS attribute. # grep PASSWORD_MINDAYS /etc/default/security /var/adm/userdb/* If the attribute PASSWORD_MINDAYS is less than 1, this is a finding.

Fix text

For both Trusted Mode and SMSE: Use the SAM/SMH interface to ensure that password changes are restricted to no less than once every 24 hours. Use the SAM/SMH interface (/etc/default/security file) and/or the userdbset command (/var/adm/userdb/* files) to ensure that password changes are restricted to no less than once every 24 hours. See the below example: PASSWORD_MINDAYS=1 Note: Never use a text editor to modify any /var/adm/userdb database file. The database contains checksums and other binary data, and editors (vi included) do not follow the file locking conventions that are used to control access to the database. If manually editing the /etc/default/security file, save any change(s) before exiting the editor.

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