GHSA-8vmr-h7h5-cqhg: matrix-media-repo (MMR) allows unauthenticated writes to the media repository, which may allow planting of problematic content

1. GitHub Advisory Database
2. GitHub Reviewed
3. CVE-2024-36402

matrix-media-repo (MMR) allows unauthenticated writes to the media repository, which may allow planting of problematic content

Moderate severity GitHub Reviewed Published Jan 16, 2025 in t2bot/matrix-media-repo • Updated Jan 16, 2025

Package

gomod github.com/t2bot/matrix-media-repo (Go)

Affected versions

< 1.3.5

Impact

MMR before version 1.3.5 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

MMR 1.3.5 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

matrix-org/matrix-spec-proposals#3916

References

• GHSA-8vmr-h7h5-cqhg
• matrix-org/matrix-spec-proposals#3916

Published to the GitHub Advisory Database

Jan 16, 2025

Last updated

Jan 16, 2025