CVE-2024-37303 – matrix-synapse

Package

Manager: pip
Name: matrix-synapse
Vulnerable Version: >=0 <1.106

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

EPSS: 0.00106 pctl0.29352

Details

Synapse's unauthenticated writes to the media repository allow planting of problematic content ### Impact 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. ### Patches 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. ### Workarounds Though extremely limited, server operators can use more strict rate limits based on IP address. ### References * https://github.com/matrix-org/matrix-spec-proposals/pull/3916 ### For more information If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).

Metadata

Created: 2024-12-03T18:40:01Z
Modified: 2024-12-03T18:40:01Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/12/GHSA-gjgr-7834-rhxr/GHSA-gjgr-7834-rhxr.json
CWE IDs: ["CWE-306"]
Alternative ID: GHSA-gjgr-7834-rhxr
Finding: F006
Auto approve: 1