The identification string SSH-2.0-Cisco-1.25 is a common sight for network engineers, appearing during SSH connections to a vast number of Cisco switches and routers. It is not merely a version number; it's a digital banner announced by the SSH server on a device as soon as a TCP connection is established on port 22.
This is a "prefix truncation" attack where a man-in-the-middle (MitM) attacker can secretly remove parts of the encrypted handshake. ssh-2.0-cisco-1.25 vulnerability
To mitigate the SSH-2.0-Cisco-1.25 vulnerability: The identification string SSH-2
: A prefix truncation weakness in the SSH protocol that could allow a man-in-the-middle attacker to downgrade the connection's security by deleting messages from the beginning of the secure channel. Erlang SSH Remote Code Execution (RCE) To mitigate the SSH-2
Resolving the SSH-2.0-Cisco-1.25 vulnerability requires updating the device’s software to a version that supports stronger encryption and more secure key exchanges. 1. Identify Affected Devices