Restrict malicious file from one www folder access to other www folders

I have multiple websites by multiple clients. If one of the clients (s)ftp access is compromised or a malicious file is uploaded via their website then can I on the rackspace cloud restrict the malicious file from accessing other www folders since this is a dedicated server.


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The answer on this question covers a setup to restrict SFTP users to their own directory in quite a bit of detail. I’d recommend starting there.