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How dangerous can CHMOD be at 777?


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I do not fully understand what it means. I know it means that everyone has the ability to read, write, and execute, but what does everyone mean? Do you have to be logged into the linux computer to be considered a someone?


Lets say for instance I have file: /var/www/777.php


The 777.php file permission is set to 777. Can everyone modify that file? So even you the casual browser, could? Or must you still be logged into the linux computer?


Then lets have another example where its not on the internet. Lets say I have /var/777/777.php . Now that files permission is also set to 777 but it can't be viewed unlike /var/www/777.php which can be by domainname/777.php .


Are both/neither/one of them safe from outside modification? Thanks.  :)

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