The operating system must require the change of at least 50% of the total number of characters when passwords are changed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-203628	SRG-OS-000072-GPOS-00040	SV-203628r557610_rule		Medium

Description
If the operating system allows the user to consecutively reuse extensive portions of passwords, this increases the chances of password compromise by increasing the window of opportunity for attempts at guessing and brute-force attacks. The number of changed characters refers to the number of changes required with respect to the total number of positions in the current password. In other words, characters may be the same within the two passwords; however, the positions of the like characters must be different. If the password length is an odd number then number of changed characters must be rounded up. For example, a password length of 15 characters must require the change of at least 8 characters.

Description

If the operating system allows the user to consecutively reuse extensive portions of passwords, this increases the chances of password compromise by increasing the window of opportunity for attempts at guessing and brute-force attacks. The number of changed characters refers to the number of changes required with respect to the total number of positions in the current password. In other words, characters may be the same within the two passwords; however, the positions of the like characters must be different. If the password length is an odd number then number of changed characters must be rounded up. For example, a password length of 15 characters must require the change of at least 8 characters.

STIG	Date
General Purpose Operating System Security Requirements Guide	2021-10-05

Details

Check Text ( C-3753r557608_chk )
Verify the operating system requires the change of at least eight of the total number of characters when passwords are changed. If it does not, this is a finding.

Fix Text (F-3753r557609_fix)
Configure the operating system to require the change of at least eight of the total number of characters when passwords are changed.