Description
A vulnerability was found in keycloak before 6.0.2. The X.509 authenticator supports the verification of client certificates through the CRL, where the CRL list can be obtained from the URL provided in the certificate itself (CDP) or through the separately configured path. The CRL are often available over the network through unsecured protocols ('http' or 'ldap') and hence the caller should verify the signature and possibly the certification path. Keycloak currently doesn't validate signatures on CRL, which can result in a possibility of various attacks like man-in-the-middle.
Remediation
References
http://www.securityfocus.com/bid/108748
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3875
Related Vulnerabilities
CVE-2021-21368 Vulnerability in npm package msgpack5
CVE-2018-20801 Vulnerability in maven package org.webjars:highcharts
CVE-2023-25763 Vulnerability in maven package org.jenkins-ci.plugins:email-ext
CVE-2023-38704 Vulnerability in npm package import-in-the-middle
CVE-2018-1000822 Vulnerability in maven package org.codelibs.fess:fess