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By: falcon | September 19, 2017

Last week I got an email from the abuse department of my ISP.  Their automated message said that there is a service with an exploitable vulnerability running on "one of my devices".  Apparently it was SSDP - the Simple Service Discovery Protocol, which can be used to facilitate a DDoS attack.


Their system found that this SSDP service was available on UDP port 32788.


This could be one of the users of my shell server violating the terms of service, or it could be unrelated to the shell server altogether.  I tried to log into my modem, and found that the administrative web page would not load.  Even though the Internet connection was up, this part of my modem was down.  So I power cycled the modem.


 When it...

Category: Uncategorized 

Tags: security, ports, abuse 

By: falcon | January 09, 2017

On December 31st, 2016, I changed the network scheme for the server.  It was set to DMZ and now it is not.  I forwarded ports 22 and 80 for the essential functioning of my shell service.  This effectively closed all other incoming ports for users of the server.  Quite a few of the users were running IRC bouncers, and I am aware that this has interrupted service for those users.


Since one of the reasons to close the ports was for increased security, I need to take some time to get a better understanding of the security issues surrounding this before I make a decision.  Originally, my intention was to provide an environment for learning and practice at the command line, which really doesn't need any ports to be opened.


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