Problem Description:

The SSH protocol executes an initial handshake between the server and the client. This protocol handshake includes the possibility of several extensions allowing different options to be selected. Validation of the packets in the handshake is done through sequence numbers.

Impact:

A man in the middle attacker can silently manipulate handshake messages to truncate extension negotiation messages potentially leading to less secure client authentication algorithms or deactivating keystroke timing attack countermeasures.

>= 14.0 lt 14.0_4

>= 13.2 lt 13.2_9