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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 17, 2025

Package

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

Affected versions

< 1.3.5

Patched versions

1.3.5

Description

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

@turt2live turt2live published to t2bot/matrix-media-repo Jan 16, 2025
Published to the GitHub Advisory Database Jan 16, 2025
Reviewed Jan 16, 2025
Published by the National Vulnerability Database Jan 16, 2025
Last updated Jan 17, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS score

0.043%
(11th percentile)

Weaknesses

CVE ID

CVE-2024-36402

GHSA ID

GHSA-8vmr-h7h5-cqhg

Source code

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