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Check: AZLX-23-002455

Amazon Linux 2023 STIG: AZLX-23-002455 (in version v1 r1)

Title

Amazon Linux 2023 must automatically lock an account when three unsuccessful logon attempts occur. (Cat II impact)

Discussion

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.

Check Content

Verify Amazon Linux 2023 is configured to lock an account after three unsuccessful logon attempts with the command: $ grep 'deny =' /etc/security/faillock.conf deny = 3 If the "deny" option is not set to "3" or less (but not "0"), is missing or commented out, this is a finding.

Fix Text

Configure Amazon Linux 2023 to lock an account when three unsuccessful logon attempts occur. Add/modify the "/etc/security/faillock.conf" file to match the following line: deny = 3

Additional Identifiers

Rule ID: SV-274154r1120450_rule

Vulnerability ID: V-274154

Group Title: SRG-OS-000329-GPOS-00128

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-002238	Automatically lock the account or node for either an organization-defined time period, until the locked account or node is released by an administrator, or delays the next logon prompt according to the organization-defined delay algorithm when the maximum number of unsuccessful logon attempts is exceeded.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-7	Unsuccessful Logon Attempts