FreeBSD : py-matrix-synapse -- malformed events may prevent users from joining federated rooms (2327234d-fc4b-11ea-adef-641c67a117d8)
High Nessus Plugin ID 140725
The remote FreeBSD host is missing one or more security-related updates.
Affected Synapse versions assume that all events have an 'origin' field set. If an event without the 'origin' field is sent into a federated room, servers not already joined to the room will be unable to do so due to failing to fetch the malformed event. Impact : An attacker could cause a denial of service by deliberately sending a malformed event into a room, thus preventing new servers (and thus their users) from joining the room.