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V-282360

CAT II (Medium)

TOSS 5 must automatically lock an account when three unsuccessful login attempts occur.

Rule ID

SV-282360r1200060_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-force attacks, is reduced. Limits are imposed by locking the account. Satisfies: SRG-OS-000021-GPOS-00005, SRG-OS-000329-GPOS-00128

Check Content

Verify TOSS 5 is configured to lock an account after three unsuccessful login attempts using the command:

$ grep 'deny =' /etc/security/faillock.conf

deny = 3

If the "deny" option is not set to "3" or less (but not "0"), is missing or commented out, this is a finding.

Fix Text

Configure TOSS 5 to lock an account when three unsuccessful login attempts occur.

Add or modify the "/etc/security/faillock.conf" file to match the following line:

deny = 3