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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).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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

submitted 1 year ago by GustavoM 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] 4 points 1 year ago* (last edited 1 year ago)

The directory you are creating your files in likely is set to immutable or append only.

lsattr -d /path/to/directory

if you see i or a, then that's the issue.

You can remove them with
sudo chattr -i /path/to/dir #removes immutable
sudo chattr -a /path/to/dir #removes append only

Same goes for files but if it happens to all files in a directory, then that is probably it.