Ubuntu 24.04 LTS must enforce a minimum 15-character password length.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-270732 | SRG-OS-000078-GPOS-00046 | UBTU-24-400320 | SV-270732r1066685_rule | 2026-02-06 | 1 |
Description
The shorter the password, the lower the number of possible combinations that need to be tested before the password is compromised.
Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password length is one factor of several that helps to determine strength and how long it takes to crack a password. Use of more characters in a password helps to exponentially increase the time and/or resources required to compromise the password.
Satisfies: SRG-OS-000078-GPOS-00046, SRG-OS-000730-GPOS-00190
ℹ️ Check
Verify the pwquality configuration file enforces a minimum 15-character password length with the following command:
$ grep -i minlen /etc/security/pwquality.conf
minlen=15
If "minlen" parameter value is not "15" or higher, is commented out, or is missing, this is a finding.
✔️ Fix
Configure Ubuntu 24.04 LTS to enforce a minimum 15-character password length.
Add or modify the "minlen" parameter value to the "/etc/security/pwquality.conf" file:
minlen=15