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XCCDF
General Purpose Operating System Security Requirements Guide
SRG-OS-000072
The operating system must require the change of at least 50 percent of the total number of characters when passwords are changed.
The operating system must require the change of at least 50 percent of the total number of characters when passwords are changed.
An XCCDF Rule
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The operating system must require the change of at least 50 percent of the total number of characters when passwords are changed.
Medium Severity
<VulnDiscussion> 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 eight characters.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>