STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

TOSS must require the change of at least eight characters when passwords are changed.

DISA Rule

SV-253063r1016313_rule

Vulnerability Number

V-253063

Group Title

SRG-OS-000072-GPOS-00040

Rule Version

TOSS-04-040080

Severity

CAT II

CCI(s)

• CCI-004066 - For password-based authentication, enforce organization-defined composition and complexity rules.

Weight

10

Fix Recommendation

Configure the operating system to require the change of at least eight of the total number of characters when passwords are changed by setting the "difok" option.

Add the following line to "/etc/security/pwquality.conf" (or modify the line to have the required value):

difok = 8

Check Contents

Verify the value of the "difok" option in "/etc/security/pwquality.conf" with the following command:

$ sudo grep difok /etc/security/pwquality.conf
difok = 8

If the value of "difok" is set to less than "8" or is commented out, this is a finding.

Vulnerability Number

V-253063

Documentable

False

Rule Version

TOSS-04-040080

Severity Override Guidance

Verify the value of the "difok" option in "/etc/security/pwquality.conf" with the following command:

$ sudo grep difok /etc/security/pwquality.conf
difok = 8

If the value of "difok" is set to less than "8" or is commented out, this is a finding.

Check Content Reference

M

Target Key

5469