CVE-2023-1664: Keycloak core Keycloak Untrusted Certificate Validation Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-5cc8-pgp5-7mpm
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CVSS 6.5
CWE-295
Published
Advisory Summary

CVE-2023-1664 is a MODERATE (CVSS 6.5) keycloak untrusted certificate validation vulnerability vulnerability (CWE-295: Improper Certificate Validation) affecting Keycloak core libraries in the Maven ecosystem. The issue involves keycloak untrusted certificate validation vulnerability. Remediation is available by upgrading affected packages to version 21.1.2.

CVE-2023-1664 at a Glance

CVE Identifier CVE-2023-1664
GHSA Identifier GHSA-5cc8-pgp5-7mpm
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Keycloak core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2023-1664

To remediate this vulnerability, upgrade all affected Keycloak core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.keycloak:keycloak-core fixed: 21.1.2 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-core</artifactId>
    <version>21.1.2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.keycloak

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2023-1664, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.keycloak

Analyze the terminal output to locate any version of Keycloak core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 21.1.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.keycloak command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Keycloak core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A flaw was found in keycloak-core. This flaw considers the scenario when using X509 Client Certificate Authenticatior with the option "Revalidate Client Certificate". A user may be able to choose, if directly connect to keycloak (not passing via reverse proxy) a specific certificate. If there's a configuration error in KC_SPI_TRUSTSTORE_FILE_FILE the authenticator allows even with the "Cannot validate client certificate trust: Truststore not available" message as there's no certificate to trust against.

CVE-2023-1664 Affected Keycloak core Versions

1 component(s)
Fixed Versions:
21.1.2
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-core
maven/org.keycloak/keycloak-core
Maven
< 21.1.2
21.1.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/keycloak/keycloak/security/advisories/GHSA-5cc8-pgp5-7mpm
NVD — CVE-2023-1664 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-1664
Keycloak core Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2023-1664
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2182196&comment#0
Keycloak core Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2023-1664?
CVE-2023-1664 is a security vulnerability in Keycloak core involving Keycloak Untrusted Certificate Validation vulnerability under CWE-295: Improper Certificate Validation.
Which Keycloak core versions are affected?
Affected versions include releases prior to 21.1.2 across affected packages: org.keycloak:keycloak-core.
What version fixes CVE-2023-1664?
Upgrading to 21.1.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-core affected?
Yes, org.keycloak:keycloak-core is affected in releases prior to 21.1.2. Upgrade your dependency to 21.1.2 or later.
What is the CVSS score of CVE-2023-1664?
CVE-2023-1664 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2023-1664?
CVE-2023-1664 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check Maven dependencies for CVE-2023-1664?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.keycloak'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5cc8-pgp5-7mpm",
  "modified" : "2023-06-30T20:30:30Z",
  "published" : "2023-06-30T20:30:30Z",
  "aliases" : [ "CVE-2023-1664" ],
  "summary" : "Keycloak Untrusted Certificate Validation vulnerability",
  "details" : "A flaw was found in keycloak-core. This flaw considers the scenario when using X509 Client Certificate Authenticatior with the option \"Revalidate Client Certificate\". A user may be able to choose, if directly connect to keycloak (not passing via reverse proxy) a specific certificate. If there's a configuration error in KC_SPI_TRUSTSTORE_FILE_FILE the authenticator allows even with the \"Cannot validate client certificate trust: Truststore not available\" message as there's no certificate to trust against.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "21.1.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/security/advisories/GHSA-5cc8-pgp5-7mpm"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-1664"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2023-1664"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2182196&comment#0"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-06-30T20:30:30Z",
    "nvd_published_at" : null
  }
}