CVE-2018-14655 : What You Need to Know

Keycloak versions 3.4.3.Final, 4.0.0.Beta2, and 4.3.0.Final have a vulnerability that can lead to a successful cross-site scripting (XSS) attack.

Understanding CVE-2018-14655

Keycloak versions 3.4.3.Final, 4.0.0.Beta2, and 4.3.0.Final are affected by a security vulnerability that allows for the injection of arbitrary JavaScript code, potentially resulting in a cross-site scripting (XSS) attack.

What is CVE-2018-14655?

CVE-2018-14655 is a vulnerability in Keycloak versions 3.4.3.Final, 4.0.0.Beta2, and 4.3.0.Final that enables malicious injection of arbitrary JavaScript code through the 'state'-parameter in the authentication URL when using the 'response_mode=form_post'. This can lead to a successful cross-site scripting (XSS) attack.

The Impact of CVE-2018-14655

The vulnerability in Keycloak versions 3.4.3.Final, 4.0.0.Beta2, and 4.3.0.Final can have the following impacts:

Successful cross-site scripting (XSS) attacks

Technical Details of CVE-2018-14655

Key technical details of CVE-2018-14655 include:

Vulnerability Description

Vulnerability Type: Cross-Site Scripting (XSS)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required

Affected Systems and Versions

Affected Product: Keycloak
Vendor: Red Hat
Vulnerable Versions: 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final

Exploitation Mechanism

The vulnerability can be exploited by injecting arbitrary JavaScript code through the 'state'-parameter in the authentication URL when using 'response_mode=form_post'.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2018-14655 vulnerability:

Immediate Steps to Take

Update Keycloak to a non-vulnerable version
Implement input validation to prevent malicious code injection

Long-Term Security Practices

Regularly monitor and update security patches
Educate users on safe browsing practices

Patching and Updates

Apply security patches provided by Red Hat