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Vulnerability · Published Nov 25, 2024 · Assigned by redhat

CVE-2024-9666Org.keycloak/keycloak-quarkus-server: keycloak proxy header handling denial-of-service (dos) vulnerability

Medium 4.7

In plain English

A medium-severity security flaw in keycloak. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.4%top 65.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.keycloak:keycloak-quarkus-serverno fix listedGHSA-jgwc-jh89-rpgq
Mavenorg.keycloak:keycloak-quarkus-server26.0.6GHSA-jgwc-jh89-rpgq

Affected products (as reported)

VendorProductVersions
keycloak 0 – before 24.0.925.0.0 – before 26.0.6
Red Hat Red Hat build of Keycloak 24 see references
Red Hat Red Hat build of Keycloak 24 see references
Red Hat Red Hat build of Keycloak 24 see references
Red Hat Red Hat build of Keycloak 24.0.9 see references
Red Hat Red Hat build of Keycloak 26.0 see references
Red Hat Red Hat build of Keycloak 26.0 see references
Red Hat Red Hat build of Keycloak 26.0 see references
Red Hat Red Hat build of Keycloak 26.0.6 see references
Red Hat Red Hat Build of Keycloak see references
Red Hat Red Hat JBoss Enterprise Application Platform 8 see references

Weakness: CWE-444 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References