Microsoft Entra ID’s FIDO Flub: Downgrade Attack Puts Users at Phishing Risk!

Researchers have devised a FIDO downgrade attack against Microsoft Entra ID, tricking users into authenticating with weaker methods vulnerable to phishing. This allows attackers to hijack sessions, highlighting a crucial weakness in bypassing the supposedly phishing-resistant system. While not yet rampant, the risk in highly targeted attacks is significant.

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Hot Take:

Ah, the irony! FIDO, our knight in shining armor against phishing, turns out to have a chink in its armor. Who would have thought that a little browser spoofing could strip FIDO of its superpower status and invite phishing right back to the party? It’s like discovering that Superman is allergic to capes!

Key Points:

  • Researchers have devised a FIDO downgrade attack targeting Microsoft Entra ID.
  • The attack exploits weaker login methods, making users vulnerable to phishing and session hijacking.
  • Using Evilginx, attackers can intercept session cookies and hijack accounts.
  • Downgrade attack shows a bypass in the FIDO system, raising concerns about its security claims.
  • Mitigation includes disabling fallback authentication methods and being cautious of unexpected login prompts.

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