OL 9 must automatically lock an account when three unsuccessful logon attempts occur during a 15-minute time period.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-271754 | SRG-OS-000329-GPOS-00128 | OL09-00-002416 | SV-271754r1184208_rule | 2026-02-17 | 1 |
Description
By limiting the number of failed logon attempts the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.
Satisfies: SRG-OS-000329-GPOS-00128, SRG-OS-000021-GPOS-00005
ℹ️ Check
Verify OL 9 locks an account after three unsuccessful logon attempts within a period of 15 minutes with the following command:
$ grep fail_interval /etc/security/faillock.conf
fail_interval = 900
If the "fail_interval" option is not set to "900" or less (but not "0"), the line is commented out, or the line is missing, this is a finding.
✔️ Fix
Configure OL 9 to lock out the "root" account after a number of incorrect login attempts within 15 minutes using "pam_faillock.so" by enabling the feature using the following command:
$ sudo authselect enable-feature with-faillock
Then edit the "/etc/security/faillock.conf" file as follows:
fail_interval = 900