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Full Discussion: chmod 777 security risks?
Top Forums UNIX for Dummies Questions & Answers chmod 777 security risks? Post 302097258 by Gary777 on Wednesday 22nd of November 2006 10:18:20 PM
Old 11-22-2006
Thanks - Can you tell me more?

Thanks for the reply, can you elabaorate just a bit?

Are you saying that unless a person (perhaps a hacker) has access to my shell account or FTP access to my server then he really can't harm the existing .html and .shtml files that I would chmod 666 or 777?

It seems to me that regardless of how I chmod the files in public_html, if a hacker gains access to my server he would be deduction have access to dirs deeper than /public_html right?

Ok, I just did an experiment, I chmod 777'ed an html file and tried to edit and publish it with Composer, if I don't enter a user name and password for the FTP upload it will not let me write the file. It also says the directory is password protected which I expected.

Is it possible for someone to hack this chmod'ed 777 file? I understand that it would not be wise to explain how in a public forum but I simply can't upload that application until I am certain my site will be safe.

Also, is it possible for anyone not on my server to tell what the write permissions are set to?

Thanks and regards,

Gary
 

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CHMOD(1)						      General Commands Manual							  CHMOD(1)

NAME
chmod - change mode SYNOPSIS
chmod mode file ... DESCRIPTION
The mode of each named file is changed according to mode, which may be an octal number or a symbolic change to the existing mode. A mode is an octal number constructed from the OR of the following modes. 0400 read by owner 0200 write by owner 0100 execute (search in directory) by owner 0070 read, write, execute (search) by group 0007 read, write, execute (search) by others A symbolic mode has the form: [who] op permission The who part is a combination of the letters u (for user's permissions), g (group) and o (other). The letter a stands for ugo. If who is omitted, the default is a. Op can be + to add permission to the file's mode, - to take away permission, and = to assign permission absolutely (all other bits will be reset). Permission is any combination of the letters r (read), w (write), x (execute), a (append only), and l (exclusive access). Only the owner of a file or the group leader of its group may change the file's mode. SOURCE
/sys/src/cmd/chmod.c SEE ALSO
ls(1), stat(2), stat(5) CHMOD(1)
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