Description
A vulnerability was found in all versions of Keycloak Gatekeeper, where on using lower case HTTP headers (via cURL) an attacker can bypass our Gatekeeper. Lower case headers are also accepted by some webservers (e.g. Jetty). This means there is no protection when we put a Gatekeeper in front of a Jetty server and use lowercase headers.
Remediation
References
https://bugzilla.redhat.com/show_bug.cgi?id=1868591
https://issues.jboss.org/browse/KEYCLOAK-14090
Related Vulnerabilities
CVE-2020-14340 Vulnerability in maven package org.jboss.xnio:xnio-api
CVE-2017-2585 Vulnerability in maven package org.keycloak:keycloak-core
CVE-2021-21695 Vulnerability in maven package org.jenkins-ci.main:jenkins-core
CVE-2021-4264 Vulnerability in maven package org.webjars.npm:dustjs-linkedin
CVE-2022-41929 Vulnerability in maven package org.xwiki.platform:xwiki-platform-oldcore