CVE-2019-10157 : Vulnerability Insights and Analysis

Keycloak Node.js Adapter Vulnerability

Understanding CVE-2019-10157

What is CVE-2019-10157?

Keycloak's Node.js adapter before version 4.8.3 had a vulnerability that allowed an attacker with local access to manipulate a web token, potentially blocking user access indefinitely.

The Impact of CVE-2019-10157

The impact of this vulnerability is rated as MEDIUM with a base score of 4.7. It poses a high availability impact, allowing attackers to exploit the issue locally.

Technical Details of CVE-2019-10157

Vulnerability Description

The Node.js adapter of Keycloak lacked proper verification of the web token during backchannel logout, enabling attackers to manipulate the token by setting an NBF parameter.

Affected Systems and Versions

Product: Keycloak
Vendor: Red Hat
Versions Affected: 4.8.3

Exploitation Mechanism

Attackers with local access could exploit the vulnerability by crafting a malicious web token with an NBF parameter, potentially denying user access.

Mitigation and Prevention

Immediate Steps to Take

Upgrade Keycloak to version 4.8.3 or later to mitigate the vulnerability.
Monitor and restrict access to sensitive systems to prevent unauthorized manipulation of web tokens.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Implement strong access controls and authentication mechanisms to prevent unauthorized access.

Patching and Updates

Apply security patches and updates provided by Red Hat to ensure the latest fixes are in place.