Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.
Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| matrix-synapse | — | 1.74.0 |
| synapse | — | 1.74.0 |
References
Similar Threats
- Low CVE-2023-41335
- Low CVE-2023-42453
- Medium CVE-2023-32682
- Low CVE-2023-32683
- High CVE-2022-39335
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