ZITADEL's Improper Lockout Mechanism Leads to MFA Bypass

Impact

ZITADEL provides users the possibility to use Time-based One-Time-Password (TOTP) and One-Time-Password (OTP) through SMS and Email.

While ZITADEL already gives administrators the option to define a Lockout Policy with a maximum amount of failed password check attempts, there was no such mechanism for (T)OTP checks.

Patches

2.x versions are fixed on >= 2.50.0

Workarounds

There is no workaround since a patch is already available.

References

None

Questions

If you have any questions or comments about this advisory, please email us at [email protected]

Credits

Thanks to Jack Moran from Layer 9 Information Security, Ethan from zxsecurity and Amit Laish from GE Vernova for finding and reporting the vulnerability.