Title

Ubuntu 24.04 LTS must store only encrypted representations of passwords. (Cat II 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 per policy requirements.

Check Content

Verify the Ubuntu operating system stores only encrypted representations of passwords with the following command: $ grep pam_unix.so /etc/pam.d/common-password password [success=1 default=ignore] pam_unix.so obscure sha512 shadow remember=5 rounds=100000 If the "sha512" parameter value is missing from the "pam_unix.so" line, this is a finding.

Fix Text

Configure Ubuntu 24.04 LTS to store encrypted representations of passwords. Add or modify the "sha512" 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=100000

Additional Identifiers

Rule ID: SV-270725r1066664_rule

Vulnerability ID: V-270725

Group Title: SRG-OS-000073-GPOS-00041

Expert Comments

CCIs tied to check.

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