CVE-2021-35342 : Vulnerability Insights and Analysis

A security vulnerability has been identified in the useradm service 1.14.0 and 1.13.0 in Northern.tech Mender Enterprise versions before 2.7.1 and 2.6.1, respectively. This CVE allows users to access the system with their JWT token after logging out due to missing invalidation when the JWT verification cache is enabled.

Understanding CVE-2021-35342

This section provides insights into the impacts, technical details, and mitigation strategies related to CVE-2021-35342.

What is CVE-2021-35342?

The useradm service versions in Northern.tech Mender Enterprise allow unauthorized access to the system using JWT tokens even after logout, posing a security risk to sensitive data and operations.

The Impact of CVE-2021-35342

The vulnerability enables users to bypass logout restrictions and retain access to the system, potentially compromising confidentiality, integrity, and availability of resources.

Technical Details of CVE-2021-35342

Below are specific details regarding the vulnerability and its exploitation.

Vulnerability Description

The issue arises from a lack of invalidation when using JWT tokens, permitting users to maintain active sessions post-logout, leading to unauthorized access.

Affected Systems and Versions

Northern.tech Mender Enterprise versions 2.7.x before 2.7.1 and 2.6.x before 2.6.1 are affected by this security flaw, exposing systems to exploitation.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the JWT token cache to sustain access post-logout, circumventing normal session termination.

Mitigation and Prevention

This section outlines immediate steps and overarching practices to enhance security measures.

Immediate Steps to Take

Users are advised to apply relevant patches promptly, review access controls, and monitor system logs for anomalous activities to detect unauthorized access.

Long-Term Security Practices

Implementing robust session management, regular security audits, and educating users on secure logout practices are essential for mitigating similar vulnerabilities.

Patching and Updates

Ensure timely installation of security patches provided by Northern.tech for Mender Enterprise versions to address the CVE-2021-35342 vulnerability.