UBTU-20-010072 - The Ubuntu operating system must automatically lock an account until the locked account is released by an administrator when three unsuccessful logon attempts have been made.

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Information

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.

Satisfies: SRG-OS-000329-GPOS-00128, SRG-OS-000021-GPOS-00005

Solution

Configure the Ubuntu operating system to utilize the 'pam_faillock' module.

Edit the /etc/pam.d/common-auth file.

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

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_CAN_Ubuntu_20-04_LTS_V1R5_STIG.zip

Item Details

References: CAT|III, CCI|CCI-000044, CCI|CCI-002238, Rule-ID|SV-238235r802383_rule, STIG-ID|UBTU-20-010072, Vuln-ID|V-238235

Plugin: Unix

Control ID: 8a65f95e7ed05aaeab04a5b84b2e198f739e6139342885a6f91cfaf01035dc99