[hackcheck] squid has a uid 0 account

I got an email from my cpanel server with the following text:

IMPORTANT: Do not ignore this email. This message is to inform you that account squid has user id 0 (root privs). This could mean that your system was compromised (OwN3D). To be safe you should verify that your system has not been compromised.

What does this mean and what should my actions be?

 

 

 

 

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