CVE-2022-39335 : What You Need to Know

This CVE-2022-39335 affects Synapse, an open-source Matrix homeserver maintained by the Matrix.org Foundation. The vulnerability in Synapse versions up to 1.68.0 allows unauthorized servers to request sensitive event information in a room. It was patched in version 1.69.0.

Understanding CVE-2022-39335

Synapse does not apply adequate checks to servers requesting authentication events, exposing sensitive information to unauthorized actors.

What is CVE-2022-39335?

CVE-2022-39335 arises from a lack of validation in Synapse that allows unauthorized homeservers to access authorization events in a room.

The Impact of CVE-2022-39335

The vulnerability exposes sensitive event data to unauthorized actors, potentially leading to unauthorized access and information leakage.

Technical Details of CVE-2022-39335

The vulnerability in Synapse version up to 1.68.0 allows unauthorized servers to query for authorization events without proper validation.

Vulnerability Description

Synapse homeservers do not adequately verify requests for authorization events, potentially providing unauthorized access to sensitive information.

Affected Systems and Versions

Vendor: matrix-org
Product: synapse
Affected Versions: < 1.69.0

Exploitation Mechanism

Unauthorized servers can exploit this vulnerability to request and access sensitive event information without proper validation.

Mitigation and Prevention

To address CVE-2022-39335, it is crucial to take immediate action and implement long-term security practices.

Immediate Steps to Take

Upgrade to Synapse version 1.69.0 or later to mitigate the vulnerability.

Long-Term Security Practices

Regularly update Synapse to the latest version to prevent known vulnerabilities.
Conduct security assessments to identify and address potential risks proactively.

Patching and Updates

Stay informed about security updates related to Synapse and apply patches promptly to ensure a secure environment.