Finding ID | Version | Rule ID | IA Controls | Severity |
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V-230345 | RHEL-08-020023 | SV-230345r627750_rule | Medium |
Description |
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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. In RHEL 8.2 the "/etc/security/faillock.conf" file was incorporated to centralize the configuration of the pam_faillock.so module. Also introduced is a "local_users_only" option that will only track failed user authentication attempts for local users in /etc/passwd and ignore centralized (AD, IdM, LDAP, etc.) users to allow the centralized platform to solely manage user lockout. From "faillock.conf" man pages: Note that the default directory that "pam_faillock" uses is usually cleared on system boot so the access will be reenabled after system reboot. If that is undesirable a different tally directory must be set with the "dir" option. Satisfies: SRG-OS-000021-GPOS-00005, SRG-OS-000329-GPOS-00128 |
STIG | Date |
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Red Hat Enterprise Linux 8 Security Technical Implementation Guide | 2021-03-04 |
Check Text ( C-33014r567781_chk ) |
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Check that the system includes the root account when locking an account after three unsuccessful logon attempts within a period of 15 minutes with the following commands: Note: This check applies to RHEL versions 8.2 or newer, if the system is RHEL version 8.0 or 8.1, this check is not applicable. Verify the pam_faillock.so module is present in the "/etc/pam.d/system-auth" and " /etc/pam.d/password-auth" files: $ sudo grep pam_faillock.so /etc/pam.d/system-auth /etc/pam.d/password-auth /etc/pam.d/system-auth:auth required pam_faillock.so preauth /etc/pam.d/system-auth:auth required pam_faillock.so authfail /etc/pam.d/system-auth:account required pam_faillock.so /etc/pam.d/password-auth:auth required pam_faillock.so preauth /etc/pam.d/password-auth:auth required pam_faillock.so authfail /etc/pam.d/password-auth:account required pam_faillock.so preauth If the pam_failllock.so module is not present in the "/etc/pam.d/system-auth" and " /etc/pam.d/password-auth" files, this is a finding. Verify the "/etc/security/faillock.conf" file is configured to log user name information when unsuccessful logon attempts occur: $ sudo grep even_deny_root /etc/security/faillock.conf even_deny_root If the "even_deny_root" option is not set, is missing or commented out, this is a finding. |
Fix Text (F-32989r567782_fix) |
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Configure the operating system to include root when locking an account after three unsuccessful logon attempts occur in 15 minutes. Add/Modify the appropriate sections of the "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" files to match the following lines: auth required pam_faillock.so preauth auth required pam_faillock.so authfail account required pam_faillock.so Add/Modify the "/etc/security/faillock.conf" file to match the following line: even_deny_root |