Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsUpgrade async-nats to version 0.29.0 or higher.
async-nats is an async Rust NATS client.
Affected versions of this package are vulnerable to Man-in-the-Middle (MitM) due to TLS certificate common name validation bypass.
The common name of the server's TLS certificate is validated against the hostname provided by the server's plaintext INFO message during the initial connection setup phase. A MitM proxy can tamper with the host field's value by substituting it with the common name of a valid certificate it controls, fooling the client into accepting it.
INFO messageINFO, alters the host JSON field and passes the tampered INFO back to the clienthost was set to the common name of said certificaterustls accepts the certificate, having verified that the common name matches the attacker-controlled value it was given