Can 777 permissions increase security risk on an average Ubuntu single-user machine? How? What are other downsides of it?


  • I really don't know why people have this heavy negative though about this , 777 means grant privilege to every account on the system , assuming you have only one or two account "root and www-data" it's wont be matter , I use 777 to solve issue when editing my files when login as root to the server , I may add another account add assign it to www-data group but this will makes me wary more about the new account security . – Salem F Aug 23 '20 at 7:36

Yes ofcourse, for example, someone might gain access to a guest account, in that case having chmod 777 all over makes it easier to access private data or modify the system.

  • But assuming that no one else has physical access to my computer, can it still cause problems? – Dexter Oct 1 '13 at 14:09
  • @Dexter Yes. If its a file that you personally don't have write or execute privileges for (without sudo) then If someone can trick you to run a program or script 777 privileges make it possible for it to do harm. Linux is largely virus free because it has a strong security model if you have 777 access on files that don't need it you make it less secure/ – Warren Hill Oct 1 '13 at 14:39
  • yes, because they will have remote access as well. With that permission they might as well be sitting in your chair. – Mateo May 24 '14 at 19:18

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