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say we create subdomain.example.com.
it creates example/public_html/subdomain.
so if files in example/public_html/subdomain/* are compromised,
can they affect example/public_html/*?
i remember one of our clients sites had an open source php web app and it injected code in all .php files on their site. so would have putting that app in a subdomain helped keep the rest of their site immune?
thanks in advance for any replies!
This is really not a very secure set-up, and I'd suggest calling in a security consultant or setting up the multiple subdomains on a host where you can define different virtual servers for each of them -- Generally, that means hosting on a virtual private server or a dedicated server.
"There's cheap, there's secure, and there's easy. Pick any two" -- An anonymous pundit