AIX must require passwords to contain no more than three consecutive repeating characters.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215232 | AIX7-00-001136 | SV-215232r991589_rule | CCI-000366 | medium |
| Description | ||||
| Passwords with excessive repeating characters may be more vulnerable to password-guessing attacks. | ||||
| STIG | Date | |||
| IBM AIX 7.x Security Technical Implementation Guide | 2024-08-16 | |||
Details
Check Text (C-215232r991589_chk)
Check system default for "maxrepeats" attribute:
# lssec -f /etc/security/user -s default -a maxrepeats
default maxrepeats=3
If the default "maxrepeats" is greater than "3", or its value is not set, or its value is set to "0", this is a finding.
Check the "maxrepeats" setting for all users using:
# lsuser -a maxrepeats ALL
The above command should yield the following output:
root maxrepeats=3
daemon maxrepeats=3
bin maxrepeats=3
sys maxrepeats=3
If the "maxrepeats" setting for any user is greater than "3", or its value is set to "0", this is a finding.
Fix Text (F-16428r294148_fix)
Use the "chsec" command to set "maxrepeats" to "3" for the default stanza:
# chsec -f /etc/security/user -s default -a maxrepeats=3
Use the "chsec" command to set "maxrepeats" to "3" for all the users who have "maxrepeats" values that are greater than "3", or its value is set to "0":
# chuser maxrepeats=3 [user_name]