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I received about 50 messages today with the similar message:

WordPress Firewall has detected and blocked a potential attack!

Web Page: Warning: URL may contain dangerous content! Offending IP: [ Get IP location ] Offending Parameter: controller = ../../../../../../../../../../../../../../../proc/self/environ

This may be a "Directory Traversal Attack."

How much should I worry about these? It came from multiple IP addresses throughout the day.

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Harmless. These type of requests are quite normal. And that "wordpress firewall" thing is probably useless... –  onetrickpony Dec 12 '11 at 2:52
That is what I was thinking, but I had to ask. –  Mike Wills Dec 12 '11 at 2:55

1 Answer 1

up vote 4 down vote accepted

This is very common, it is a malicious query string most likely (99% time) done by a bot, I think option=com_simpledownload is actually a Joomla plugin, so obviously it won't effect WordPress.

You can see the detials here,

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