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V-282361

CAT II (Medium)

TOSS 5 must automatically lock an account when three unsuccessful login attempts occur during a 15-minute time period.

Rule ID

SV-282361r1200063_rule

STIG

Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000044 CCI-002238

Discussion

By limiting the number of failed login attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account. Satisfies: SRG-OS-000021-GPOS-00005, SRG-OS-000329-GPOS-00128

Check Content

Note: If the system administrator (SA) demonstrates the use of an approved centralized account management method that locks an account after three unsuccessful login attempts within a period of 15 minutes, this requirement is not applicable.

Verify TOSS 5 locks an account after three unsuccessful login attempts within a period of 15 minutes using the following command:

$ grep fail_interval /etc/security/faillock.conf 

fail_interval = 900

If the "fail_interval" option is not set to "900" or less (but not "0"), the line is commented out, or the line is missing, this is a finding.

Fix Text

Configure TOSS 5 to lock out the "root" account after a number of incorrect login attempts within 15 minutes. 

Enable "pam_faillock.so" using the following command:
 
$ authselect enable-feature with-faillock 

Edit the "/etc/security/faillock.conf" file as follows:

fail_interval = 900