usefulfor.com/security

I have created a small ruby script to check if there are running servers on a given port number. The script is able to check a list of hosts and will output an informational message on the port status for each host.

Let’s begin with the script. Then we can talk about the work it does.
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The Timestamp is an ICMP (rfc792) message which is used for time synchronization. The Timestamp Reply message consists of the originating timestamp sent by the sender of the Timestamp as well as a receive timestamp and a transmit timestamp.

If your machine answers ICMP Timestamp messages an attacker can learn the date which is set on your machine. This may help him to defeat all your time based authentication protocols.

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