STIGQter: STIG Summary: Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

Ubuntu 24.04 LTS must automatically lock an account until the locked account is released by an administrator when three unsuccessful logon attempts have been made.

DISA Rule

SV-270690r1067126_rule

Vulnerability Number

V-270690

Group Title

SRG-OS-000021-GPOS-00005

Rule Version

UBTU-24-200610

Severity

CAT III

CCI(s)

• CCI-000044 - Enforce the organization-defined limit of consecutive invalid logon attempts by a user during the organization-defined time period.
• 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.

Weight

10

Fix Recommendation

Configure Ubuntu 24.04 LTS to utilize the "pam_faillock" module.

Edit the /etc/pam.d/common-auth file to add the following lines below the "auth" definition for pam_unix.so:
auth [default=die] pam_faillock.so authfail
auth sufficient pam_faillock.so authsucc

Configure the "pam_faillock" module to use the following options:

Edit the /etc/security/faillock.conf file and add/update the following keywords and values:
audit
silent
deny = 3
fail_interval = 900
unlock_time = 0

Check Contents

Verify that Ubuntu 24.04 LTS utilizes the "pam_faillock" module with the following command:

$ grep faillock /etc/pam.d/common-auth
auth [default=die] pam_faillock.so authfail
auth sufficient pam_faillock.so authsucc

If the pam_faillock.so module is not present in the "/etc/pam.d/common-auth" file, this is a finding.

Verify the pam_faillock module is configured to use the following options:

$ sudo egrep 'silent|audit|deny|fail_interval| unlock_time' /etc/security/faillock.conf
audit
silent
deny = 3
fail_interval = 900
unlock_time = 0

If the "silent" keyword is missing or commented out, this is a finding.
If the "audit" keyword is missing or commented out, this is a finding.
If the "deny" keyword is missing, commented out, or set to a value greater than "3", this is a finding.
If the "fail_interval" keyword is missing, commented out, or set to a value greater than "900", this is a finding.
If the "unlock_time" keyword is missing, commented out, or not set to "0", this is a finding.

Vulnerability Number

V-270690

Documentable

False

Rule Version

UBTU-24-200610

Severity Override Guidance

Verify that Ubuntu 24.04 LTS utilizes the "pam_faillock" module with the following command:

$ grep faillock /etc/pam.d/common-auth
auth [default=die] pam_faillock.so authfail
auth sufficient pam_faillock.so authsucc

If the pam_faillock.so module is not present in the "/etc/pam.d/common-auth" file, this is a finding.

Verify the pam_faillock module is configured to use the following options:

$ sudo egrep 'silent|audit|deny|fail_interval| unlock_time' /etc/security/faillock.conf
audit
silent
deny = 3
fail_interval = 900
unlock_time = 0

If the "silent" keyword is missing or commented out, this is a finding.
If the "audit" keyword is missing or commented out, this is a finding.
If the "deny" keyword is missing, commented out, or set to a value greater than "3", this is a finding.
If the "fail_interval" keyword is missing, commented out, or set to a value greater than "900", this is a finding.
If the "unlock_time" keyword is missing, commented out, or not set to "0", this is a finding.

Check Content Reference

M

Target Key

5673