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

From VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide

Part of SRG-OS-000072-GPOS-00040

Associated with: CCI-000195

SV-99111r1_rule The SLES for vRealize must require the change of at least eight of the total number of characters when passwords are changed.

Vulnerability discussion

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.

Check content

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

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, 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

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