CVE-2019-3875 : What You Need to Know

A security flaw has been discovered in Keycloak versions prior to 6.0.2, leaving it vulnerable to various attacks.

Understanding CVE-2019-3875

Keycloak's X.509 authenticator lacks signature validation on Certificate Revocation Lists (CRL), exposing it to potential man-in-the-middle attacks.

What is CVE-2019-3875?

The vulnerability in Keycloak versions before 6.0.2 allows attackers to exploit the lack of CRL signature validation, compromising security.

The Impact of CVE-2019-3875

CVSS Score: 6.5 (Medium Severity)
Attack Vector: Network
Confidentiality Impact: Low
Integrity Impact: Low
Privileges Required: None
Scope: Unchanged
User Interaction: None
Attack Complexity: Low
Availability Impact: None

Technical Details of CVE-2019-3875

Keycloak's vulnerability lies in the X.509 authenticator's handling of CRLs, making it susceptible to attacks.

Vulnerability Description

The flaw allows attackers to bypass CRL signature validation, potentially leading to man-in-the-middle attacks.

Affected Systems and Versions

Affected Product: Keycloak
Vendor: Red Hat
Affected Version: 6.0.2

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating CRLs due to the lack of signature validation in Keycloak.

Mitigation and Prevention

To secure systems from CVE-2019-3875, follow these steps:

Immediate Steps to Take

Update Keycloak to version 6.0.2 or later.
Implement secure protocols for accessing CRLs.

Long-Term Security Practices

Regularly monitor and validate CRLs for authenticity.
Conduct security audits to identify and address vulnerabilities.

Patching and Updates

Apply security patches promptly to address known vulnerabilities in Keycloak.