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The Ubuntu operating system must prohibit password reuse for a minimum of five generations.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-100587 | UBTU-18-010108 | SV-109691r1_rule | Low |
| 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 as per policy requirements. |
| STIG | Date |
|---|---|
| Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide | 2020-05-29 |
Details
| Check Text ( C-99445r1_chk ) |
|---|
| Verify that the Ubuntu operating system prevents passwords from being reused for a minimum of five generations by running the following command: # grep -i remember /etc/pam.d/common-password password [success=1 default=ignore] pam_unix.so sha512 shadow remember=5 rounds=5000 If the "remember" parameter value is not greater than or equal to 5, commented out, or not set at all this is a finding. |
| Fix Text (F-106273r1_fix) |
|---|
| Configure the Ubuntu operating system prevents passwords from being reused for a minimum of five generations. Add, or modify the "remember" parameter value to the following line in "/etc/pam.d/common-password" file: password [success=1 default=ignore] pam_unix.so sha512 shadow remember=5 rounds=5000 |