Wireshark isn’t configured to work with Telnet at the outset, so you need to tell it what to sniff. Choose Start > All Programs > Wireshark and you’ll see the initial Wireshark display shown here. The nefarious individual who gains access to your network to sniff about will have significantly more skills and be able to learn considerably more than you’ll learn using the simple directions in this post.Īfter you complete the installation, you’ll be able to start Wireshark. In fact, this post is exceptionally simple and is designed only to make you aware of deficiencies in Telnet security. This post isn’t designed to make you an expert in protocol sniffing. Using a sniffer is somewhat dangerous and you need administrator privileges to do it. If you’re using some other version or configuration of Wireshark, your screen may not look precisely like mine. Part of the Wireshark setup will also install WinPcap, so you don’t need to install this product separately. To make things simple, I performed a full install. Because I’m using the 64-bit version of Windows 7, I downloaded the 64-bit Windows installer for the 1.4.7 version of Wireshark. This post will rely on a free utility named Wireshark because it does the job admirably and is supported on a number of platforms. Consequently, the main emphasis of this post is building an awareness of the security issues behind using Telnet so that you can make a good decision about using it to meet your needs.īefore you can see the security issues for yourself, you need to download a utility to sniff packets on your network. Lack of security is one of the reasons I didn’t cover this utility in the “ Windows Command-Line Administration Instant Reference.” (Telnet is covered from a command line perspective in “ Administering Windows Server 2008 Server Core.”) However, the lack of security isn’t a problem in some situations and many administrators prefer to use Telnet to manage some network hardware such as switches and routers.
The only protection you have is firewalls and other security you might have in place -Telnet is completely open and offers nothing in the way of security. It’s incredibly easy for someone to monitor your Telnet session.
Now you have enough information to view some of the security issues with Telnet. In my previous post about Telnet entitled, “ Using Telnet to Perform Tasks” you discovered how to use Telnet to work interactively.
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