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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Non-root user that (suddenly) has elevated privileges in a specific command (only). [Have I been hacked?] (lemmy.world)

submitted 9 months ago by [email protected] to c/[email protected]

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Title. Long,short story: creating or editing files with nano as my non-root user gives (the file) elevated privileges, like I have ran it w/ sudo or as root. And the (only) "security hole" that I can think of is a nextdns docker container running as root. That aside, its very "overkill" security-wise (cap_drop=ALL, non-root image, security_opt=no_new_privileges, etc.).

It's like someone tried to hack me but gave up halfway. Am I right or wrong to assume this? Just curious.

Thanks in advance.

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[–] [email protected] 1 points 9 months ago* (last edited 9 months ago) (3 children)

i.e file is created (as non-root), trying to remove the file (once again, as non-root) gives me a "rm: cannot remove 'dir/file.name': Permission denied" error message.

[–] [email protected] 6 points 9 months ago (1 children)

OK I see. Can you create a new file with nano and then do an "ls -l" so we can see the permissions it's given? Also provide the output of the command "umask" as the user you're working with.

[–] [email protected] 0 points 9 months ago (1 children)

Just did it, and it shows my sudoer username with ownership of the created file. umask returns me 0002.

[–] [email protected] 7 points 9 months ago (1 children)

Can you paste the line from ls -l? Sanitize the username/date/time if you need to. Example:

-rw-r--r-- 1 bolapara users 0 Nov 21 17:19 asdf

[–] [email protected] -2 points 9 months ago (1 children)

-rw-rw-r-- 1 $sudoer $sudoer $date $createdfilename.

[–] [email protected] 2 points 9 months ago (1 children)

That is not an elevated permission, your user should be able to delete that file, do the same in another directory if it works it might be a permission, or more likely an attribute, problem on the directory itself or something on the path to it.

[–] [email protected] 3 points 9 months ago* (last edited 9 months ago)

You cannot say if user able do delete the file or not. It depends on the directory permissions (deleting a file is modifying a directory).

[–] [email protected] 5 points 9 months ago

What are the permissions on the directory? What is command are you running to edit the file? What command are you running to delete it? (Have you got selinux turned on? What filesystem is this directory on?)

[–] [email protected] 4 points 9 months ago

Do you have write permissions on the directory?