RHEL 10 must automatically lock an account when three unsuccessful login attempts occur.

By limiting the number of failed login attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.

Satisfies: SRG-OS-000329-GPOS-00128, SRG-OS-000021-GPOS-00005

Verify RHEL 10 is configured to lock an account after three unsuccessful login attempts with the following command:

$ sudo grep 'deny =' /etc/security/faillock.conf deny = 3

If the "deny" option is not set to "3" or less (but not "0"), or is missing or commented out, this is a finding.

Configure RHEL 10 to lock an account when three unsuccessful login attempts occur.

Add/modify the "/etc/security/faillock.conf" file to match the following line:

deny = 3