CVE-2020-14389: Redhat Keycloak Privilege Escalation

CVE-2020-14389 Overview

A broken access control vulnerability was discovered in Red Hat Keycloak before version 12.0.0. The flaw permits users with only the view-profile role to manage resources in the new account console, enabling unauthorized access and modification of data that the user was not intended to have. This represents a significant privilege escalation issue in the identity and access management platform.

Critical Impact

Authenticated users with minimal privileges can escalate their access to manage account resources, potentially compromising data integrity and confidentiality across the Keycloak deployment.

Affected Products

• Red Hat Keycloak versions prior to 12.0.0
• All Keycloak deployments using the new account console feature
• Identity management systems relying on Keycloak role-based access control

Discovery Timeline

• 2020-11-17 - CVE-2020-14389 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2020-14389

Vulnerability Analysis

This vulnerability stems from inadequate authorization checks in Keycloak's new account console functionality. When users authenticate with only the view-profile role, the system fails to properly enforce the principle of least privilege. Instead of restricting these users to read-only operations, the account console permits them to perform resource management actions that should require elevated permissions.

The flaw affects the authorization boundary between viewing profile information and managing account resources. In a properly configured system, users with view-profile should only be able to read their own profile data. However, this vulnerability allows these users to bypass intended restrictions and access management functions, potentially modifying account settings, linked applications, or other sensitive resources.

Root Cause

The root cause is classified under CWE-916, which relates to use of password hash with insufficient computational effort. However, the practical manifestation of this vulnerability is a broken access control issue where the role-based permission model fails to properly validate user capabilities before granting access to resource management functions in the account console. The authorization logic does not adequately verify that the authenticated user possesses the required permissions beyond the basic view-profile role.

Attack Vector

The attack can be executed remotely over the network by any authenticated user who possesses the view-profile role. The attacker does not require any special privileges beyond basic authentication to the Keycloak system. The exploitation path involves:

1. Authenticating to Keycloak with a low-privileged account that has only the view-profile role
2. Accessing the new account console interface
3. Navigating to resource management functions that should be restricted
4. Performing unauthorized operations such as viewing, modifying, or managing account resources

The vulnerability requires low attack complexity as no special conditions or user interaction is needed beyond the initial authentication. The impact affects both confidentiality and integrity, as attackers can both access and modify data they should not have permissions to interact with.

Detection Methods for CVE-2020-14389

Indicators of Compromise

• Unusual activity patterns from users with view-profile role accessing management endpoints
• Audit logs showing resource modification events from accounts lacking appropriate management roles
• Unexpected changes to account resources or configurations made by low-privileged users

Detection Strategies

• Review Keycloak audit logs for authorization anomalies where users with view-profile role perform management operations
• Monitor account console access patterns for privilege boundary violations
• Implement alerting on resource management API calls from users with only view permissions

Monitoring Recommendations

• Enable comprehensive audit logging in Keycloak to capture all account console operations
• Configure alerts for any resource modification attempts by users lacking management roles
• Regularly review user role assignments and their correlation with observed account console activities

How to Mitigate CVE-2020-14389

Immediate Actions Required

• Upgrade Red Hat Keycloak to version 12.0.0 or later immediately
• Review audit logs to identify any potential exploitation that may have occurred
• Audit user role assignments to ensure proper least-privilege configuration
• Consider temporarily restricting access to the new account console until patches are applied

Patch Information

Red Hat has addressed this vulnerability in Keycloak version 12.0.0. Organizations should upgrade to this version or later to remediate the vulnerability. For detailed patching information and guidance, refer to the Red Hat CVE-2020-14389 Advisory. Additional technical details can be found in the Red Hat Bug Report #1875843.

Workarounds

• Restrict access to the new account console feature until the patch can be applied
• Implement network-level controls to limit who can access the account console interface
• Review and tighten role assignments to ensure users have only the minimum necessary permissions
• Consider implementing additional authorization layers or reverse proxy rules to enforce access controls

# Example: Restrict account console access via Keycloak realm configuration
# Navigate to Realm Settings > Security Defenses and review access policies
# Or implement reverse proxy rules to block account console for non-admin users

# Apache example to restrict account console access by IP
<Location "/auth/realms/*/account/*">
    Require ip 10.0.0.0/8
    Require ip 192.168.0.0/16
</Location>