CVE-2020-1728: Keycloak core Improper Restriction Of Rendered UI Vulnerability

MODERATE
Advisory Identifier: GHSA-3gg7-9q2x-79fc
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CWE-1021
Published
Advisory Summary

CVE-2020-1728 is a MODERATE improper restriction of rendered ui vulnerability (CWE-1021: Improper Restriction of Rendered UI Layers or Frames) affecting Keycloak core libraries in the Maven ecosystem. The issue involves improper restriction of rendered ui layers or frames in keycloak. Remediation is available in the latest vendor maintenance releases.

CVE-2020-1728 at a Glance

CVE Identifier CVE-2020-1728
GHSA Identifier GHSA-3gg7-9q2x-79fc
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-1021: Improper Restriction of Rendered UI Layers or Frames
Affected Product Keycloak core
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2020-1728

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: Latest secure release 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-core</artifactId>
    <version>Latest secure release</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-2020-1728, 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 the patched release), 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-1021: Improper Restriction of Rendered UI Layers or Frames, where the web application does not restrict or incorrectly restricts frame objects or ui layers that belong to another application or domain. 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 vulnerability was found in all versions of Keycloak where, the pages on the Admin Console area of the application are completely missing general HTTP security headers in HTTP-responses. This does not directly lead to a security issue, yet it might aid attackers in their efforts to exploit other problems. The flaws unnecessarily make the servers more prone to Clickjacking, channel downgrade attacks and other similar client-based attack vectors.

CVE-2020-1728 Affected Keycloak core Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-core
maven/org.keycloak/keycloak-core
Maven
≤ 9.0.3

References

NVD — CVE-2020-1728 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-1728
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1728
issues.redhat.com/browse/keycloak-122... WEB
https://issues.redhat.com/browse/KEYCLOAK-12264

Frequently Asked Questions

What is CVE-2020-1728?
CVE-2020-1728 is a security vulnerability in Keycloak core involving Improper Restriction of Rendered UI Layers or Frames in Keycloak under CWE-1021: Improper Restriction of Rendered UI Layers or Frames.
Which Keycloak core versions are affected?
Affected versions include releases prior to current release patches across affected packages: org.keycloak:keycloak-core.
What version fixes CVE-2020-1728?
Upgrading to current release patches (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 Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with CVE-2020-1728?
CVE-2020-1728 is classified under CWE-1021: Improper Restriction of Rendered UI Layers or Frames (The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain.).
How can I check Maven dependencies for CVE-2020-1728?
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-3gg7-9q2x-79fc",
  "modified" : "2020-04-15T21:07:13Z",
  "published" : "2020-04-15T21:09:40Z",
  "aliases" : [ "CVE-2020-1728" ],
  "summary" : "Improper Restriction of Rendered UI Layers or Frames in Keycloak",
  "details" : "A vulnerability was found in all versions of Keycloak where, the pages on the Admin Console area of the application are completely missing general HTTP security headers in HTTP-responses. This does not directly lead to a security issue, yet it might aid attackers in their efforts to exploit other problems. The flaws unnecessarily make the servers more prone to Clickjacking, channel downgrade attacks and other similar client-based attack vectors.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "9.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-1728"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1728"
  }, {
    "type" : "WEB",
    "url" : "https://issues.redhat.com/browse/KEYCLOAK-12264"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1021" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-04-15T21:07:13Z",
    "nvd_published_at" : "2020-04-06T14:15:00Z"
  }
}