CVE-2023-0264: Keycloak services Keycloak Vulnerable To User Impersonation Vulnerability

HIGH
Advisory Identifier: GHSA-9g98-5mj6-f9mv
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CVSS 8.7
CWE-287 CWE-345
Published
Advisory Summary

CVE-2023-0264 is a HIGH (CVSS 8.7) keycloak vulnerable to user impersonation vulnerability (CWE-287: Improper Authentication) affecting Keycloak services libraries in the Maven ecosystem. The issue involves keycloak vulnerable to user impersonation via stolen uuid code. Remediation is available by upgrading affected packages to version 21.0.1.

CVE-2023-0264 at a Glance

CVE Identifier CVE-2023-0264
GHSA Identifier GHSA-9g98-5mj6-f9mv
Severity HIGH
CVSS v3.1 Base Score 8.7
CWE Classification CWE-287: Improper Authentication
Affected Product Keycloak services
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.7

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:C/C:H/I:H/A:N).

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

How to Fix CVE-2023-0264

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: 21.0.1 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-services</artifactId>
    <version>21.0.1</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-2023-0264, 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 21.0.1), 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-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. 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's OpenID Connect user authentication was found to incorrectly authenticate requests. An authenticated attacker who could also obtain a certain piece of info from a user request, from a victim within the same realm, could use that data to impersonate the victim and generate new session tokens.

CVE-2023-0264 Affected Keycloak services Versions

1 component(s)
Fixed Versions:
21.0.1
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-services
maven/org.keycloak/keycloak-services
Maven
< 21.0.1
21.0.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv
NVD — CVE-2023-0264 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-0264
Security Fix Commit FIX COMMIT
https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c
Keycloak services Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2023-0264
Keycloak services Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2023-0264?
CVE-2023-0264 is a security vulnerability in Keycloak services involving Keycloak vulnerable to user impersonation via stolen UUID code under CWE-287: Improper Authentication.
Which Keycloak services versions are affected?
Affected versions include releases prior to 21.0.1 across affected packages: org.keycloak:keycloak-services.
What version fixes CVE-2023-0264?
Upgrading to 21.0.1 (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 21.0.1. Upgrade your dependency to 21.0.1 or later.
What is the CVSS score of CVE-2023-0264?
CVE-2023-0264 has a CVSS v3.1 base score of 8.7 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
What CWE is associated with CVE-2023-0264?
CVE-2023-0264 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check Maven dependencies for CVE-2023-0264?
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-9g98-5mj6-f9mv",
  "modified" : "2023-03-02T23:25:43Z",
  "published" : "2023-03-02T23:25:43Z",
  "aliases" : [ "CVE-2023-0264" ],
  "summary" : "Keycloak vulnerable to user impersonation via stolen UUID code",
  "details" : "Keycloak's OpenID Connect user authentication was found to incorrectly authenticate requests. An authenticated attacker who could also obtain a certain piece of info from a user request, from a victim within the same realm, could use that data to impersonate the victim and generate new session tokens.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-services"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "21.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-0264"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2023-0264"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287", "CWE-345" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-03-02T23:25:43Z",
    "nvd_published_at" : "2023-08-04T18:15:11Z"
  }
}