The VMM must require the change of at least eight of the total number of characters when passwords are changed.
Overview
Finding ID
Version
Rule ID
IA Controls
Severity
V-207375
SRG-OS-000072-VMM-000390
SV-207375r984198_rule
Medium
Description
If the VMM 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.