Millions of Requests in Seconds: Keycloak OIDC Flaw Affects Application Availability

CVE-2024-1249

Summary

A vulnerability exists in the OIDC component of Keycloak that permits unvalidated cross-origin messages via the 'checkLoginIframe' functionality. This security oversight allows attackers to orchestrate and dispatch an overwhelming volume of requests in a very short time span, which could severely compromise the availability of the affected application. The flaw stems from the lack of proper validation of incoming messages, raising concerns about its potential to facilitate denial-of-service attacks.

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