CVE-2024-37303

MEDIUM EPSS 33.6%
Published Dec 3, 20241y ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Dec 3, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

Synapse is an open-source Matrix homeserver. 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. 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.

CVSS Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
33.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-306 Missing Authentication for Critical Function Authentication

Affected Products 1

VendorProductVersionRange
matrixsynapse* <1.106.0

References 2

  • github.com https://github.com/element-hq/synapse/security/advisories/GHSA-gjgr-7834-rhxr
    Vendor Advisory
  • github.com https://github.com/matrix-org/matrix-spec-proposals/pull/3916
    Issue TrackingPatch

Remediation

  • github.com https://github.com/matrix-org/matrix-spec-proposals/pull/3916
    Issue TrackingPatch