Improper Handling of Insufficient Permissions or Privileges

Summary

The package matrix-appservice-irc is a Node.js IRC bridge for the Matrix messaging protocol. Versions prior to 2.0.0 can be exploited to leak the truncated body of a message if a malicious user sends a Matrix reply to an event ID they don't have access to. As a precondition to the attack, the malicious user needs to know the event ID of the message they want to leak, as well as to be joined to both the Matrix room and the IRC channel it is bridged to. The message reply containing the leaked message content is visible to IRC channel members when this happens. The matrix-appservice-irc fixed version checks whether the user has permission to view an event before constructing a reply. Administrators should upgrade to the fixed version. It's possible to limit the amount of information leaked by setting a reply template that doesn't contain the original message. See these lines `601-604` in the configuration file linked.