CVE-2019-5885 : What You Need to Know

Matrix Synapse before version 0.34.0.1 is vulnerable to a security issue that could allow unauthorized individuals to impersonate users remotely.

Understanding CVE-2019-5885

Before version 0.34.0.1, Matrix Synapse utilizes a predetermined value to generate a secret key and other confidential information in instances where the authentication parameter, macaroon_secret_key, is not configured. Exploiting this vulnerability could enable unauthorized individuals to impersonate users remotely.

What is CVE-2019-5885?

Matrix Synapse before 0.34.0.1, when the macaroon_secret_key authentication parameter is not set, uses a predictable value to derive a secret key and other secrets which could allow remote attackers to impersonate users.

The Impact of CVE-2019-5885

This vulnerability could potentially lead to unauthorized individuals impersonating users remotely, posing a significant security risk to affected systems.

Technical Details of CVE-2019-5885

Matrix Synapse before version 0.34.0.1 is susceptible to the following:

Vulnerability Description

The software uses a predictable value to derive a secret key and other confidential information when the macaroon_secret_key authentication parameter is not configured.

Affected Systems and Versions

Affected Version: Before 0.34.0.1

Exploitation Mechanism

Exploiting this vulnerability could allow remote attackers to impersonate users by leveraging the predictable value used to generate secret keys.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-5885:

Immediate Steps to Take

Update Matrix Synapse to version 0.34.0.1 or newer to mitigate the vulnerability.
Configure the authentication parameter, macaroon_secret_key, to enhance security.

Long-Term Security Practices

Regularly update and patch software to address security vulnerabilities promptly.
Implement strong authentication mechanisms and security best practices to prevent unauthorized access.

Patching and Updates

Stay informed about security updates and patches released by the software vendor to ensure the latest security measures are in place.