The latest version of PuTTY SSH and Telnet client adds protection against spoofing the terminal authentication prompt to steal login info. The update comes after a 20-month hiatus and fixes a total of eight security issues. The problem is with the user interface and fixing it proved to be a challenge because the UNIX terminal model offers the server remarkable control over what is shown. The fix was to print an interactive message before the start of the main session. The solution chosen by the maintainer in. the. maintainer chose to display a small icon of the program “because it is multicolored and distinctive”””
Source: https://www.bleepingcomputer.com/news/security/putty-071-fixes-weakness-that-allows-fake-login-prompts/