CVE-2022-39374 : Exploit Details and Defense Strategies
Learn about CVE-2022-39374 affecting Synapse software by matrix-org. Understand the impact, technical details, and mitigation strategies for this denial of service vulnerability.
This article discusses the CVE-2022-39374 vulnerability found in the Synapse software by matrix-org and its potential impact, technical details, and mitigation strategies.
Understanding CVE-2022-39374
Synapse Denial of service vulnerability due to incorrect application of event authorization rules during state resolution.
What is CVE-2022-39374?
Synapse, an open-source Matrix homeserver maintained by the Matrix.org Foundation, is vulnerable to a denial-of-service attack. When a malicious homeserver and Synapse are in the same room, the malicious server can manipulate Synapse to accept previously rejected events, leading to rejection of subsequent messages and state changes from the vulnerable homeserver.
The Impact of CVE-2022-39374
The vulnerability allows malicious parties to disrupt communication and potentially disrupt the functionality of the affected Synapse server, causing denial of service.
Technical Details of CVE-2022-39374
Vulnerability Description
The flaw arises from incorrect handling of event authorization rules during state resolution, enabling unauthorized manipulation of event data.
Affected Systems and Versions
The vulnerability impacts Synapse version 1.68.0 and below, specifically affecting versions >= 1.62.0 and < 1.68.0.
Exploitation Mechanism
Malicious homeservers can exploit the vulnerability by tricking Synapse into accepting rejected events, leading to subsequent rejection of messages and state changes.
Mitigation and Prevention
Immediate Steps to Take
Users are advised to update Synapse to version 1.68.0 or later to mitigate the vulnerability. Additionally, network segmentation and monitoring can help detect and prevent potential attacks.
Long-Term Security Practices
Regularly updating software and monitoring security advisories for patch releases are essential long-term practices to prevent security incidents.
Patching and Updates
Matrix-org has released a patch in version 1.68.0 to address the vulnerability. Users should promptly apply the latest updates and follow secure coding practices to enhance system security.