CVE-2020-9049 : Exploit Details and Defense Strategies

A vulnerability in specified versions of American Dynamics victor Web Client and Software House C•CURE Web Client could allow an unauthenticated attacker on the network to create and sign their own JSON Web Token and use it to execute an HTTP API Method without the need for valid authentication/authorization. This could potentially lead to a Denial of Service attack.

Understanding CVE-2020-9049

This CVE pertains to a JSON Web Token (JWT) vulnerability affecting the victor Web Client and C•CURE Web Client.

What is CVE-2020-9049?

CVE-2020-9049 is a security vulnerability that enables an attacker to create and use a JSON Web Token to execute unauthorized HTTP API methods on affected systems.

The Impact of CVE-2020-9049

The vulnerability poses a high severity risk with a CVSS base score of 7.1. It can lead to unauthorized access, data integrity compromise, and potential Denial of Service attacks.

Technical Details of CVE-2020-9049

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows unauthenticated attackers to generate and use JSON Web Tokens to execute unauthorized API methods.

Affected Systems and Versions

victor Web Client version 5.6 and prior by Johnson Controls
C•CURE Web Client version 2.90 and prior by Johnson Controls

Exploitation Mechanism

Attackers can exploit this vulnerability to create and sign their own JSON Web Token, bypassing authentication and authorization mechanisms.

Mitigation and Prevention

Protect your systems from CVE-2020-9049 with the following steps:

Immediate Steps to Take

Upgrade victor Web Client v5.6 and earlier to v5.6 SP1
Upgrade C•CURE Web v2.60 and earlier to at least v2.70
Install relevant updates for C•CURE Web v2.70, v2.80, and v2.90

Long-Term Security Practices

Implement strict access controls and authentication mechanisms
Regularly monitor and audit system logs for suspicious activities

Patching and Updates

Registered users can download the necessary software updates from the respective vendor websites.