Description

A vulnerability was found in the Keycloak Server. The Keycloak Server is vulnerable to a denial of service (DoS) attack due to improper handling of proxy headers. When Keycloak is configured to accept incoming proxy headers, it may accept non-IP values, such as obfuscated identifiers, without proper validation. This issue can lead to costly DNS resolution operations, which an attacker could exploit to tie up IO threads and potentially cause a denial of service.
The attacker must have access to send requests to a Keycloak instance that is configured to accept proxy headers, specifically when reverse proxies do not overwrite incoming headers, and Keycloak is configured to trust these headers.

Classification

CVE ID: CVE-2024-9666

Affected Products

Vendor: Red Hat

Product: Red Hat build of Keycloak 24

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 5.06% (scored less or equal to compared to others)

EPSS Date: 2025-02-03 (when was this score calculated)

References

https://access.redhat.com/errata/RHSA-2024:10175
https://access.redhat.com/errata/RHSA-2024:10176
https://access.redhat.com/errata/RHSA-2024:10177
https://access.redhat.com/errata/RHSA-2024:10178
https://access.redhat.com/security/cve/CVE-2024-9666
https://bugzilla.redhat.com/show_bug.cgi?id=2317440

Timeline