Rule ID
SV-238234r1015152_rule
Version
V2R4
Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed as per policy requirements. Satisfies: SRG-OS-000077-GPOS-00045, SRG-OS-000073-GPOS-00041
Verify the Ubuntu operating system prevents passwords from being reused for a minimum of five generations by running the following command: $ grep -i remember /etc/pam.d/common-password password [success=1 default=ignore] pam_unix.so obscure sha512 shadow remember=5 rounds=5000 If the "remember" parameter value is not greater than or equal to "5", is commented out, or is not set at all, this is a finding.
Configure the Ubuntu operating system to prevent passwords from being reused for a minimum of five generations. Add or modify the "remember" parameter value to the following line in "/etc/pam.d/common-password" file: password [success=1 default=ignore] pam_unix.so obscure sha512 shadow remember=5 rounds=5000