CVE-2024-36402 Unauthenticated writes to the media repository allow planting of problematic content in Matrix Media Repo
Unauthenticated attackers can plant malicious content in the Matrix Media Repository by exploiting unauthenticated media download endpoints.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-36402?
CVE-2024-36402 is a medium-severity missing authorization vulnerability in t2bot matrix-media-repo, published on 16 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Matrix Media Repo (MMR) is a highly configurable multi-homeserver media repository for Matrix. 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. 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. Though extremely limited, server operators can use more strict rate limits based on IP address as a partial workaround.
Weakness: CWE-287
Which versions are affected by CVE-2024-36402?
3 open source packages ship an affected version, including github.com/t2bot/matrix-media-repo. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/t2bot/matrix-media-repo Go | All versions | 1.3.5 |
github.com/t2bot/matrix-media-repo Go | All versions | 1.3.5 |
github.com/t2bot/matrix-media-repo Go | All versions | 1.3.5 |
Products include T2bot Matrix-Media-Repo.
How do I fix CVE-2024-36402?
Upgrade github.com/t2bot/matrix-media-repo to 1.3.5 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2024-36402 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-36402 exists.
Other vulnerabilities in t2bot matrix-media-repo
- CVE-2024-56515 Untrusted file formats can be thumbnailed, invoking potentially further untrusted decoders in Matrix Media Repo
- CVE-2024-36403 Denial of service/high operating costs through unauthenticated downloads in Matrix Media Repo
- CVE-2024-52791 Denial of service through memory exhaustion in Matrix Media Repo
- CVE-2024-52602 Server-Side Request Forgery (SSRF) on redirects and federation in Matrix Media Repo
Sources
Also known as GHSA-8vmr-h7h5-cqhg, GO-2025-3397.