CVE-2023-2422 Keycloak: oauth client impersonation

What is CVE-2023-2422?

CVE-2023-2422 is a medium-severity authentication bypass vulnerability in Redhat Keycloak, published on 4 Oct 2023. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A flaw was found in Keycloak. A Keycloak server configured to support mTLS authentication for OAuth/OpenID clients does not properly verify the client certificate chain. A client that possesses a proper certificate can authorize itself as any other client, therefore, access data that belongs to other clients.

Weakness: CWE-295

Which versions are affected by CVE-2023-2422?

2 open source packages ship an affected version, including org.keycloak:keycloak-services. It affects 3 products.

Products include Redhat Keycloak, Redhat Openshift Container Platform, Redhat Single Sign-On.

How do I fix CVE-2023-2422?

Upgrade org.keycloak:keycloak-services to 21.1.2 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2023-2422 being exploited?

There is no known exploitation of CVE-2023-2422 in the wild and no public exploit code.

Other vulnerabilities in Redhat Keycloak

• CVE-2022-4361 Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC Critical 10.0
• CVE-2022-1245 Keycloak vulnerable to privilege escalation on Token Exchange feature Critical 9.8
• CVE-2021-20195 keycloak Self Stored Cross-site Scripting vulnerability Critical 9.6
• CVE-2019-14910 Keycloak Authentication Error Critical 9.3
• CVE-2019-14909 Keycloak Authentication Error Critical 9.3

All Redhat Keycloak vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3qh5-qqj2-c78f.