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The system must require passwords to contain no more than three consecutive repeating characters.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-38693 | RHEL-06-000299 | SV-50494r2_rule | Low |
| Description |
|---|
| Passwords with excessive repeating characters may be more vulnerable to password-guessing attacks. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 6 Security Technical Implementation Guide | 2017-03-01 |
Details
| Check Text ( C-46255r1_chk ) |
|---|
| To check the maximum value for consecutive repeating characters, run the following command: $ grep pam_cracklib /etc/pam.d/system-auth Look for the value of the "maxrepeat" parameter. The DoD requirement is 3. If maxrepeat is not found or not set to the required value, this is a finding. |
| Fix Text (F-43642r2_fix) |
|---|
| The pam_cracklib module's "maxrepeat" parameter controls requirements for consecutive repeating characters. When set to a positive number, it will reject passwords which contain more than that number of consecutive characters. Add "maxrepeat=3" after pam_cracklib.so to prevent a run of (3 + 1) or more identical characters. password required pam_cracklib.so maxrepeat=3 |