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Protecting your Web server from Nimda

Protecting your Web server from Nimda

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The Web security tip titled Protecting the Web server

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is something I wish I had access to (or had realized) before I went to work today.

You see, my company was hit with the new Nimda worm. It uses several IIS exploits, including one that we discovered only too late: TFTP. It uploads its core code as Admin.dll and executes that DLL file from the root directory on the main (C:) drive. If we hadn't had TFTP enabled, (it is by default) we never would have had much of a problem with this worm.

Thank God for the services file in %systemroot/system32/drivers/etc/services! Specifially, the line we changed was: TFTP 69/udp
to: TFTP 0/udp

(Oh, man I hate IIS...)


This was first published in September 2001

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