zssh file transfer

[manfred-kaiser]

zssh can be used to transfer files. unlike scp or sftp, zssh uses z-modem over ssh.

https://www.linux-community.de/ausgaben/linuxuser/2020/07/daten-mit-ssh-und-zssh-ueber-langsame-verbindungen-transferieren/

[manfred-kaiser]

when using zssh with ssh-mitm, some random bytes are executed as command. Without ssh-mitm only the bytes are printed to the terminal, but they are not executed.

Example session with ssh-mitm:

user@devbox:~$ zssh -p 10022 127.0.0.1
Press ^@ (C-Space) to enter file transfer mode, then ? for help

[email protected]'s password: 

user@remotebox:~$ sz /bin/bash
�*B00000000000000
zssh > rz
Empfange: bash                                                       
Bytes empfangen:1183448/1183448   BPS:14712349                

Übertragung abgeschlossen
**0800000000022d: Befehl nicht gefunden.
user@remotebox:~$ �**0800000000022d
\udc8a**0800000000022d: Befehl nicht gefunden.
user@remotebox:~$ exit
Abgemeldet
Connection to 127.0.0.1 closed.