GHSA-xvqg-mv25-rwvw Parsing issue in matrix-org/node-irc leading to room takeovers

• npm matrix-appservice-irc: < 0.35.0 → fixed in 0.35.0

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. Workarounds Disable dynamic channel joining via `dynamicChannels.enabled` to prevent users from joining new channels, which prevents any new channels being bridged outside of what is already bridged, and what is specified in the config. References • https://matrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity Credits Discovered and reported by Val Lorentz. For more information If you have any questions or comments about this advisory email us at [email protected].