MFA Prompt Bombing: Why Your Second Factor Isn't Saving You
Summary
Attackers are exploiting a new technique called MFA prompt bombing, where they overwhelm users with repeated multi-factor authentication requests until the user approves one, effectively bypassing the security measure. This method leverages the user's fatigue or confusion to gain unauthorized access to accounts, even if credentials are not directly compromised.
IFF Assessment
This article describes a new attack method that successfully bypasses a widely adopted security control, representing a negative development for defenders.
Defender Context
MFA prompt bombing highlights a significant weakness in the user-interaction aspect of MFA. Defenders need to educate users about this attack and consider implementing policies that limit the number of MFA prompts a user can receive within a certain timeframe, or explore more robust MFA solutions that offer additional layers of verification or anomaly detection.