Title

The VMM must implement replay-resistant authentication mechanisms for network access to privileged accounts. (Cat II impact)

Discussion

A replay attack may enable an unauthorized user to gain access to the VMM. Authentication sessions between the authenticator and the VMM validating the user credentials must not be vulnerable to a replay attack. An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message. A privileged account is any VMM account with authorizations of a privileged user. Techniques used to address this include protocols using nonces (e.g., numbers generated for a specific one-time use) or challenges (e.g., TLS, WS_Security). Additional techniques include time-synchronous or challenge-response one-time authenticators.

Check Content

Verify the VMM implements replay-resistant authentication mechanisms for network access to privileged accounts. If it does not, this is a finding.

Fix Text

Configure the VMM to implement replay-resistant authentication mechanisms for network access to privileged accounts.

Additional Identifiers

Rule ID: SV-207392r958494_rule

Vulnerability ID: V-207392

Group Title: SRG-OS-000112

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.