As per CVE-2014-6271, a flaw in bash that permits malicious shell code injection was found.

Logtop is an handy log analyzer that can show realtime statistics from any given text file. Common usage example is redirecting the output of your log files to it, in order to get the top visitors of your webpages, or the top hosts requesting pages through your proxy server… all of this in a realtime top list.

This is just another way to do it: an adware/spyware free /etc/hosts for your laptop or home network.