The system must disable accounts after three consecutive unsuccessful login attempts.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-216099	SRG-OS-000021	SOL-11.1-040140	SV-216099r958388_rule	2024-11-25	3

Description
Allowing continued access to accounts on the system exposes them to brute-force password-guessing attacks.

ℹ️ Check
Verify RETRIES is set in the login file. # grep ^RETRIES /etc/default/login If the output is not RETRIES=3 or fewer, this is a finding. Verify the account locks after invalid login attempts. # grep ^LOCK_AFTER_RETRIES /etc/security/policy.conf If the output is not LOCK_AFTER_RETRIES=YES, this is a finding. For each user in the system, use the command: # userattr lock_after_retries [username] to determine if the user overrides the system value. If the output of this command is "no", this is a finding.

ℹ️ Check

Verify RETRIES is set in the login file. # grep ^RETRIES /etc/default/login If the output is not RETRIES=3 or fewer, this is a finding. Verify the account locks after invalid login attempts. # grep ^LOCK_AFTER_RETRIES /etc/security/policy.conf If the output is not LOCK_AFTER_RETRIES=YES, this is a finding. For each user in the system, use the command: # userattr lock_after_retries [username] to determine if the user overrides the system value. If the output of this command is "no", this is a finding.

✔️ Fix
The root role is required. # pfedit /etc/default/login Change the line: #RETRIES=5 to read RETRIES=3 pfedit /etc/security/policy.conf Change the line containing #LOCK_AFTER_RETRIES to read: LOCK_AFTER_RETRIES=YES If a user has lock_after_retries set to "no", update the user's attributes using the command: # usermod -K lock_after_retries=yes [username]