RHEL 10 must require the change of at least four character classes when passwords are changed.

STIG ID: RHEL-10-600300  |  SRG: SRG-OS-000072-GPOS-00040 |  Severity: medium (CAT II)  |  CCI: CCI-004066 |  Vulnerability Id: V-281189

Vulnerability Discussion

Use of a complex password helps to increase the time and resources required to compromise the password.

Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.

Password complexity is one factor of several that determines how long it takes to crack a password. The more complex a password is, the greater the number of possible combinations that must be tested before the password is compromised.

Check

Verify RHEL 10 sets the value of the "minclass" option in "/etc/security/pwquality.conf" with the following command:

$ sudo grep -s minclass /etc/security/pwquality.conf /etc/security/pwquality.conf.d/*.conf
/etc/security/pwquality.conf:minclass = 4

If the value of "minclass" is set to less than "4" or is commented out, this is a finding.

Fix

Configure RHEL 10 to require the change of at least four character classes when passwords are changed by setting the "minclass" option.

Add or update the following line in the "/etc/security/pwquality.conf" file or a configuration file in the "/etc/security/pwquality.conf.d/" directory to contain the "minclass" parameter:

minclass = 4
This website is not created by, run, approved, or endorsed by the U.S. Department of Defense. Use at your own risk. This website is created by open-source software.