The Ubuntu operating system must prohibit password reuse for a minimum of five generations.
An XCCDF Rule
Description
<VulnDiscussion>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.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-219180r610963_rule
- Severity
- Low
- References
- Updated
Remediation - Manual Procedure
Configure the Ubuntu operating system prevents 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 sha512 shadow remember=5 rounds=5000