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The SLES for vRealize must require the change of at least eight of the total number of characters when passwords are changed.


Finding ID Version Rule ID IA Controls Severity
V-89571 VRAU-SL-000360 SV-100221r1_rule High
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.
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide 2018-10-12


Check Text ( C-89263r1_chk )
Check that at least eight characters need to be changed between old and new passwords during a password change by running the following command:

# grep pam_cracklib /etc/pam.d/common-password-vmware.local

The "difok" parameter indicates how many characters must be different. The DoD requires at least eight characters to be different during a password change. This would appear as "difok=8". If difok is not found or not set to at least "8", this is a finding.

Expected Result:
password requisite pam_cracklib.so dcredit=-1 ucredit=-1 lcredit=-1 ocredit=-1 minlen=14 difok=8 retry=3
Fix Text (F-96313r2_fix)
If "difok" was not set at all in /etc/pam.d/common-password-vmware.local then run the following command:

# sed -i '/pam_cracklib.so/ s/$/ difok-8/' /etc/pam.d/common-password-vmware.local

If "difok" was set incorrectly then run the following command to set it to "8":

# sed -i '/pam_cracklib.so/ s/difok=./difok=8/' /etc/pam.d/common-password-vmware.local