Advisories for Golang/Mellium.im/Xmpp package

Mellium mellium.im/xmpp 0.0.1 through 0.21.4 allows response spoofing because the stanza type is not checked. This is fixed in 0.22.0.

Impact If no TLS configuration is provided by the user, the websocket package constructs its own TLS configuration using recommended defaults. When looking up a WSS endpoint using the DNS TXT record method described in XEP-0156: Discovering Alternative XMPP Connection Methods the ServerName field was incorrectly being set to the name of the server returned by the TXT record request, not the name of the initial server we were attempting …

If no TLS configuration is provided by the user, the websocket package constructs its own TLS configuration using recommended defaults.

In mellium.im/xmpp, an attacker capable of spoofing DNS TXT records can redirect a WebSocket connection request to a server under their control without causing TLS certificate verification to fail. This occurs because the wrong host name is selected during this verification.

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-h289-x5wc-xcv8. This link is maintained to preserve external references. Original Description In Mellium mellium.im/xmpp through 0.21.0, an attacker capable of spoofing DNS TXT records can redirect a WebSocket connection request to a server under their control without causing TLS certificate verification to fail. This occurs because the wrong host name is selected during this verification.