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11.3. Debug Message

11.3. Debug Message​

      byte      SSH_MSG_DEBUG
      boolean   always_display
      string    message in ISO-10646 UTF-8 encoding [RFC3629]
      string    language tag [RFC3066]

All implementations MUST understand this message, but they are allowed to ignore it. This message is used to transmit information that may help debugging. If 'always_display' is TRUE, the message SHOULD be displayed. Otherwise, it SHOULD NOT be displayed unless debugging information has been explicitly requested by the user.

The 'message' doesn't need to contain a newline. It is, however, allowed to consist of multiple lines separated by CRLF (Carriage Return - Line Feed) pairs.

If the 'message' string is displayed, the terminal control character filtering discussed in [SSH-ARCH] should be used to avoid attacks by sending terminal control characters.