Excessive MFA push notifications can be a sign of an attempted push notification attack, where attackers repeatedly send MFA prompts hoping the user will eventually approve one by mistake. To mitigate this:
A: Provisioning FIDO2 devices: While FIDO2 devices offer strong authentication, they may not be practical for all users and do not directly address the issue of excessive push notifications.
B: Deploying a text message-based MFA: SMS-based MFA can still be vulnerable to similar spamming attacks and phishing.
C: Enabling OTP via email: Email-based OTPs add another layer of security but do not directly solve the issue of excessive notifications.
D: Configuring prompt-driven MFA: This option allows users to respond to prompts in a secure manner, often including features like time-limited approval windows, additional verification steps, or requiring specific actions to approve. This can help prevent users from accidentally approving malicious attempts.
Configuring prompt-driven MFA is the best solution to restrict unnecessary MFA notifications and improve security.
References:
CompTIA Security+ Study Guide
NIST SP 800-63B, "Digital Identity Guidelines"
"Multi-Factor Authentication: Best Practices" by Microsoft