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RHEL-09-411075 RHEL 9 must automatically lock an account when three unsuccessful logon attempts occur.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to AC-7 via CCI-000044, CCI-002238

Title

RHEL 9 must automatically lock an account when three unsuccessful logon attempts occur.

Control

Verify RHEL 9 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.

Discussion

By limiting the number of failed logon 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

Related controls

CCI-000044, CCI-002238

Fix

Configure RHEL 9 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