From Samsung Android OS 5 with Knox 2.0 Security Technical Implementation Guide
Part of PP-MDF-201004
Associated with: CCI-000366
Password strength is a measure of the effectiveness of a password in resisting guessing and brute force attacks. Passwords that contain repeating or sequential characters are significantly easier to guess than those that do not contain repeating or sequential characters. Therefore, disallowing repeating or sequential characters increases password strength and decreases risk.
This validation procedure is performed on both the MDM Administration Console and the Samsung Knox for Android device. Check whether the appropriate setting is configured on the MDM Administration Console: 1. Ask the MDM administrator to display the "Max Sequential Characters" and "Max Sequential Numbers" settings in the "Android Password Restrictions" rule. 2. Verify the value of the setting is the same or less than the required length. On the Samsung Knox for Android device: 1. Open the device settings. 2. Select "Lock screen". 3. Select "Screen lock". 4. Enter current password. 5. Select Password. 6. Attempt to enter a password that contains sequential characters or sequential numbers of length greater than the required length. 7. Verify the password is not accepted. If the configured values of the "Max Sequential Character" and "Max Sequential Number" settings are greater than the required length, or if device accepts a password that contains sequential characters or sequential numbers of length greater than the required length, this is a finding. Note: On some MDM servers there may only be one configuration setting ("Max Sequential Characters") since this API actually disables both sequential and repeating characters.
Configure the MOS to prevent passwords from containing more than two repeating or sequential characters. On the MDM Administration Console, set the "Max Sequential Characters" and "Max Sequential Numbers" values to 2 in the "Android Password Restrictions" rule.
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