![]() Note that it is possible to abuse a service. "root" mode is disabled and you can not directly log in to a "#" prompt. They first need to connect, then provide the sudo password. A router should kill that connection and enforce a waiting period before accepting new requests from that connection.Ĭan anybody access my computer in root mode using my sudo password with no physical access to the computer, on a standard Ubuntu desktop installation ? Basically what you have here is a DOS attack (or a DDOS if 2+ computers attacking you). Here comes something else in play: a ROUTER should be smart enough to lock access from the outside if it is a repeated request asking for the same information over a short period of time. By the way: this method is considered valid and a feature, and an accepted security risk (otherwise you would never be able to fix your system in case the password did get compromised).īut I know that it is not strong enough if someone can brute-force it remotely. It will take 1 reboot by someone for that someone to be able change your root password (can be done from "grub rescue" without the need to supply your current password). I do not want to scare you too much, but if someone has physical access you handed access over to them regardless of how strong your password is. Any questions or suggestions are always welcome.I know that the sudo password protects my computer from being locally hacked by someone having physical access to it. I hope you like this quick little tutorial about using sudo without password. You can configure sudo in a way that only commands of your choice can be run without password.įor example, if you want the apt update and apt upgrade to be run without entering the password for sudo in Ubuntu, here’s what you need to do.Īnd then add a line like this: user_name ALL=(ALL) NOPASSWD:/usr/bin/apt update, /usr/bin/apt upgrade Run only specific sudo commands without password Thankfully, there is a solution for that as well. It provides you some options to deals with the changes.īut it’s not a good practice to run all the sudo commands without password. (Q)uit and save changes to sudoers file (DANGER!) > /etc/sudoers: syntax error near line 3 <<<Į(x)it without saving changes to sudoers file When you try to save your changes, it performs a check and notifies if there is any syntax error. The visudo tool creates a new temp file where you can edit the sudoer file using the default text editor. This is why you a dedicated tool called visudo is used for editing sudo configuration file. If you make a syntax error while editing this file, the consequences can be fatal. Now, you may edit /etc/sudoers file manually in a text editor like Vim, however, that is not advised. Of course, you have to replace the user_name in the above command with your user name.Įxit the shell and enter again and you should see the changes reflected. All you have to do is to add a line like this in this file: user_name ALL=(ALL) NOPASSWD:ALL This will open the default text editor (Nano in Ubuntu) for editing this file. Use the following command to edit the /etc/sudoers file: sudo visudo Let’s see how to use sudo with no password.īut first, back up the sudoer file as a precautionary measure: sudo cp /etc/sudoers ~/sudoers.bak Execute all sudo commands without password Maybe, you should disable SSH access with password first. If you are on a server, you should be extra careful specially if you have SSH enabled. In Linux, you can change sudo configuration to run some or all command with sudo but without entering password. This is specially if you are the only user on the system or if you think some commands are okay to run without password. Some users may find it cumbersome to enter the password all the time. Which means that you’ll have to enter the password again if you run a command with sudo after fifteen minutes. The default timeout for the password is 15 minutes (in Ubuntu Linux). When you run a command with sudo, it asks for your account’s password. Most Linux distributions like Ubuntu, Debian, Fedora use the sudo mechanism to allow admin users to run commands with root privileges. Learn how to run some or all sudo commands without entering the password on Ubuntu or any other Linux distribution.
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