element-hq synapse up to 1.105 missing authentication

Summaryinfo

A vulnerability was found in element-hq synapse up to 1.105. It has been classified as critical. Impacted is an unknown function. This manipulation causes missing authentication. This vulnerability appears as CVE-2024-37303. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in element-hq synapse up to 1.105 and classified as critical. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a missing authentication vulnerability. The CWE definition for the vulnerability is CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthenticated remote participants to trigger a download and caching of remote media from a remote homeserver to the local media repository. Such content then also becomes available for download from the local homeserver in an unauthenticated way. The implication is that unauthenticated remote adversaries can use this functionality to plant problematic content into the media repository. Synapse 1.106 introduces a partial mitigation in the form of new endpoints which require authentication for media downloads. The unauthenticated endpoints will be frozen in a future release, closing the attack vector.

The advisory is shared at github.com. This vulnerability is known as CVE-2024-37303 since 06/05/2024. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 234210 (Linux Distros Unpatched Vulnerability : CVE-2024-37303), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.106 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (234210). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• element-hq

Name

• synapse

Version

• 1.105

Website

• Product: https://github.com/element-hq/synapse/

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion