integrated in SSH-MITM server

The OpenSSH client through 8.8 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).

Affected Software:
  • OpenSSHH <= 8.8

PoC Exploit

The trivial authentication spoofing attack is described in Trivial Authentication.