GHSA-XVQG-MV25-RWVW Parsing issue in matrix-org/node-irc leading to room takeovers

Impact Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel. Patched The vulnerability has been patched in matrix-appservice-irc 0.35.0...

CVE-2022-39203 Parsing issue in matrix-org/node-irc leading to room takeovers

matrix-appservice-irc is an open source Node.js IRC bridge for Matrix. Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel. The...

Signature Verification Bypass

github.com/matrix-org/dendrite is vulnerable to signature verification bypass. A remote attacker is able to provide invalid or modified malicious events to spread via an endpoint because the events retrieved from a remote homeserver using the /getmissingevents path does not verify their signature...

GO-2022-0952 Incorrect event parsing in github.com/matrix-org/gomatrixserverlib

Power level parsing does not parse the "eventsdefault" key of the m.room.powerlevels event, setting the event default power level to zero in all cases. This can cause events to be improperly accepted or rejected in rooms where the eventdefault power level has been changed...

Authorization Bypass

github.com/matrix-org/dendrite is vulnerable to authorization bypass. The vulnerability exists in the eventsdefault level in m.room.powerlevels events of eventcontent.go when defaulting the event default power level to zero in all cases, resulting in events either being incorrectly authorized or...

GHSA-7H5V-85W9-PQ6C Denial of service (via resource exhaustion) due to improper input validation in third-party identifier endpoint

Impact Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Patches The issue is fixed by https://github.com/matrix-org/synapse/pull/9855. Workarounds There are no...