GHSA-8vmr-h7h5-cqhg
matrix-media-repo (MMR) allows unauthenticated writes to the media repository, which may allow planting of problematic content
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/t2bot/matrix-media-repo | < 1.3.5 | 1.3.5 |
Details
As written in the advisory (Markdown source, shown as plain text).
### 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
https://github.com/matrix-org/matrix-spec-proposals/pull/3916
References
External links from the advisory. They lead to third-party sites.