CVE-2023-6134: Keycloak services Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-cvg2-7c3j-g36j
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CVSS 4.6
CWE-75
Published
Advisory Summary

CVE-2023-6134 is a MODERATE (CVSS 4.6) cross-site scripting vulnerability (CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)) affecting Keycloak services libraries in the Maven ecosystem. The issue involves keycloak vulnerable to reflected xss via wildcard in oidc redirect_uri. Remediation is available by upgrading affected packages to version 23.0.3.

CVE-2023-6134 at a Glance

CVE Identifier CVE-2023-6134
GHSA Identifier GHSA-cvg2-7c3j-g36j
Severity MODERATE
CVSS v3.1 Base Score 4.6
CWE Classification CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)
Affected Product Keycloak services
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.6

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

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

How to Fix CVE-2023-6134

To remediate this vulnerability, upgrade all affected Keycloak services 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-services fixed: 23.0.3 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-services</artifactId>
    <version>23.0.3</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-2023-6134, 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 services in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 23.0.3), 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-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection), where the product does not adequately filter user-controlled input for special elements with control implications. In Keycloak services, 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

Keycloak prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This could permit an attacker to submit a specially crafted request leading to XSS or possibly further attacks.

CVE-2023-6134 Affected Keycloak services Versions

1 component(s)
Fixed Versions:
23.0.3
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-services
maven/org.keycloak/keycloak-services
Maven
< 23.0.3
23.0.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/keycloak/keycloak/security/advisories/GHSA-cvg2-7c3j-g36j
NVD — CVE-2023-6134 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-6134
Security Fix Commit FIX COMMIT
https://github.com/keycloak/keycloak/commit/15a21bf8e4fb71f006ba9caf25b9c9d1d152cd20
access.redhat.com/errata/rhsa-2023:78... WEB
https://access.redhat.com/errata/RHSA-2023:7854
access.redhat.com/errata/rhsa-2023:78... WEB
https://access.redhat.com/errata/RHSA-2023:7855
access.redhat.com/errata/rhsa-2023:78... WEB
https://access.redhat.com/errata/RHSA-2023:7856
access.redhat.com/errata/rhsa-2023:78... WEB
https://access.redhat.com/errata/RHSA-2023:7857
access.redhat.com/errata/rhsa-2023:78... WEB
https://access.redhat.com/errata/RHSA-2023:7858
access.redhat.com/errata/rhsa-2023:78... WEB
https://access.redhat.com/errata/RHSA-2023:7860
access.redhat.com/errata/rhsa-2023:78... WEB
https://access.redhat.com/errata/RHSA-2023:7861
Keycloak services Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2023-6134
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2249673
Keycloak services Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2023-6134?
CVE-2023-6134 is a security vulnerability in Keycloak services involving Keycloak vulnerable to reflected XSS via wildcard in OIDC redirect_uri under CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection).
Which Keycloak services versions are affected?
Affected versions include releases prior to 23.0.3 across affected packages: org.keycloak:keycloak-services.
What version fixes CVE-2023-6134?
Upgrading to 23.0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-services affected?
Yes, org.keycloak:keycloak-services is affected in releases prior to 23.0.3. Upgrade your dependency to 23.0.3 or later.
What is the CVSS score of CVE-2023-6134?
CVE-2023-6134 has a CVSS v3.1 base score of 4.6 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2023-6134?
CVE-2023-6134 is classified under CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) (The product does not adequately filter user-controlled input for special elements with control implications.).
How can I check Maven dependencies for CVE-2023-6134?
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-cvg2-7c3j-g36j",
  "modified" : "2023-12-18T19:31:02Z",
  "published" : "2023-12-18T19:31:02Z",
  "aliases" : [ "CVE-2023-6134" ],
  "summary" : "Keycloak vulnerable to reflected XSS via wildcard in OIDC redirect_uri",
  "details" : "Keycloak prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This could permit an attacker to submit a specially crafted request leading to XSS or possibly further attacks.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-services"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "23.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/security/advisories/GHSA-cvg2-7c3j-g36j"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-6134"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/commit/15a21bf8e4fb71f006ba9caf25b9c9d1d152cd20"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2023:7854"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2023:7855"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2023:7856"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2023:7857"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2023:7858"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2023:7860"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2023:7861"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2023-6134"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2249673"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-75" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-12-18T19:31:02Z",
    "nvd_published_at" : null
  }
}