Solved

File folder permissions for Linux web server (Amazon EC2)

Posted on 2014-01-05
3
1,041 Views
Last Modified: 2014-01-06
hi guys

I have a web server in the cloud hosted with Amazon cloud. It's a linux server.

Not long ago, the website was badly compromised due to flaws in the PHP code. So the hacker was able to 'inject' some sort of code and was able to make changes to the php file.

The security holes in the PHP code have been patched. However, we're still worried of something like that happening in the future.

As it stands, the files and folders on the public facing side seem to have the 775 permissions. The owner of this group is the actual EC2-user, which is the default user. However you can only access the files/folders as this user if you have a special private key, otherwise you can't (well, the hacker evidently did when the site was vulnerable).

Question is, if this was you, how would you tighten the security? Would you create a new user and set all files and folders on the public side to have 755 permissions and make that user the owner of those files/folders?

thank you
Yash
0
Comment
Question by:Yashy
  • 2
3 Comments
 
LVL 34

Expert Comment

by:Duncan Roe
ID: 39757895
If you can get in as owner, you can always change permissions. Do the files need to be group-writable? They should only be group writable if it's actually necessary.
0
 
LVL 1

Author Comment

by:Yashy
ID: 39758040
The don't need to be group writeable no.

Point is, the new user I create will be given to our developers. So in terms of ownership, what would you change? (if i'm being too vague, let me know what you need and I'll provide more info)

THanks
0
 
LVL 34

Accepted Solution

by:
Duncan Roe earned 500 total points
ID: 39758684
As root, I would do a chown -R on the system so all the files belong to the newly created user. Still no need for group write I should think.
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Is your company's data protection keeping pace with virtualization? Here are 7 dynamic ways to adapt to rapid breakthroughs in technology.
For cloud, the “train has left the station” and in the Microsoft ERP & CRM world, that means the next generation of enterprise software from Microsoft is here: Dynamics 365 is Microsoft’s new integrated business solution that unifies CRM and ERP fun…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question