Ubuntu 24.04 LTS must store only encrypted representations of passwords.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-270725 | UBTU-24-400220 | SV-270725r1101789_rule | CCI-004062 | medium |
| Description | ||||
| Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed per policy requirements. | ||||
| STIG | Date | |||
| Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide | 2025-05-16 | |||
Details
Check Text (C-270725r1101789_chk)
Verify the Ubuntu operating system stores only encrypted representations of passwords with the following command:
$ grep pam_unix.so /etc/pam.d/common-password
password [success=1 default=ignore] pam_unix.so obscure sha512 shadow rounds=100000
If "sha512" is missing from the "pam_unix.so" line, or if the "rounds" is set to less than 100000, this is a finding.
Fix Text (F-74659r1101788_fix)
Configure Ubuntu 24.04 LTS to store encrypted representations of passwords.
Add or modify the "sha512" parameter value to the following line in "/etc/pam.d/common-password" file:
password [success=1 default=ignore] pam_unix.so obscure sha512 shadow rounds=100000