The system must require passwords contain at least one lowercase alphabetic character.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000193

SV-64065r1_rule The system must require passwords contain at least one lowercase alphabetic character.

Vulnerability discussion

To enforce the use of complex passwords, minimum numbers of characters of different classes are mandated. The use of complex passwords reduces the ability of attackers to successfully obtain valid passwords using guessing or exhaustive search techniques. Complexity requirements increase the password search space by requiring users to construct passwords from a larger character set than they may otherwise use.

Check content

Check /etc/pam.d/system-auth for lcredit setting. Procedure: Check the password lcredit option # grep pam_cracklib.so /etc/pam.d/system-auth Confirm the lcredit option is set to -1 as in the example: password required pam_cracklib.so lcredit=-1 There may be other options on the line. If no such line is found, or the lcredit is not -1 this is a finding.

Fix text

Edit "/etc/pam.d/system-auth" to include the line: password required pam_cracklib.so lcredit=-1 prior to the "password include system-auth-ac" line.

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