The AAA Service must be configured to prohibit password reuse for a minimum of five generations.

From Authentication Authorization and Accounting Service Security Requirements Guide

Associated with: CCI-000200

SRG-APP-000165-AAA-000055_rule The AAA Service must be configured to prohibit password reuse for a minimum of five generations.

Vulnerability discussion

Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. To meet password policy requirements, passwords need to be changed at specific policy-based intervals. 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.

Check content

If the AAA Service relies on directory services for user account management this is not applicable and the connected directory services must perform this function. Verify the AAA Service is configured to prohibit password reuse for a minimum of five generations. This requirement may be verified by demonstration or configuration review. If the AAA Service is not configured to prohibit password reuse for a minimum of five generations, this is a finding.

Fix text

Configure the AAA Service to prohibit password reuse for a minimum of five generations.

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