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UBTU-24-300017 Ubuntu 24.04 LTS must enforce a delay of at least four seconds between logon prompts following a failed logon attempt.

DISA STIG library V1R7
All changes in this version
first version loaded CAT III

Maps to CM-6 via CCI-000366

Title

Ubuntu 24.04 LTS must enforce a delay of at least four seconds between logon prompts following a failed logon attempt.

Control

Verify Ubuntu 24.04 LTS enforces a delay of at least four seconds between logon prompts following a failed logon attempt with the following command: $ grep pam_faildelay /etc/pam.d/common-auth auth required pam_faildelay.so delay=4000000 If the value for "delay" is not set to "4000000" or greater, the line is commented out, or is missing, this is a finding.

Discussion

Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain access to an account. The delay option is set in microseconds.

Related controls

CCI-000366

Fix

Configure Ubuntu 24.04 LTS to enforce a delay of at least four seconds between logon prompts following a failed logon attempt. Edit the file "/etc/pam.d/common-auth" and set the parameter "pam_faildelay" to a value of "4000000" or greater: auth required pam_faildelay.so delay=4000000