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The system must require passwords to contain at least one numeric character.


Finding ID Version Rule ID IA Controls Severity
V-38482 RHEL-06-000056 SV-50282r1_rule Low
Requiring digits makes password guessing attacks more difficult by ensuring a larger search space.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2015-05-26


Check Text ( C-46037r1_chk )
To check how many digits are required in a password, run the following command:

$ grep pam_cracklib /etc/pam.d/system-auth

The "dcredit" parameter (as a negative number) will indicate how many digits are required. The DoD requires at least one digit in a password. This would appear as "dcredit=-1".
If dcredit is not found or not set to the required value, this is a finding.
Fix Text (F-43427r1_fix)
The pam_cracklib module's "dcredit" parameter controls requirements for usage of digits in a password. When set to a negative number, any password will be required to contain that many digits. When set to a positive number, pam_cracklib will grant +1 additional length credit for each digit. Add "dcredit=-1" after pam_cracklib.so to require use of a digit in passwords.