Check: UBTU-20-010070
Canonical Ubuntu 20.04 LTS STIG:
UBTU-20-010070
(in versions v1 r12 through v1 r5)
Title
The Ubuntu operating system must prohibit password reuse for a minimum of five generations. (Cat III impact)
Discussion
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
Check Content
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.
Fix Text
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
Additional Identifiers
Rule ID: SV-238234r832945_rule
Vulnerability ID: V-238234
Group Title: SRG-OS-000077-GPOS-00045
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000196 |
The information system, for password-based authentication, stores only cryptographically-protected passwords. |
CCI-000200 |
The information system prohibits password reuse for the organization-defined number of generations. |
Controls
Number | Title |
---|---|
IA-5 (1) |
Password-Based Authentication |