#Sudo su without password full#
#Sudo su without password password#

#Sudo su without password password#

Generally, when you use sudo, the system will save your password for subsequent uses of the command, and expire this password after 10 minutes of no sudo use. By changing the date you can bypass this requirement. After 10 minutes this should expire and require you enter your password again. Running 'sudo su' to switch users and exist as the root user (shown here), requires you authenticate (see the 'password' prompt). While at first glance it appears this issue allows anyone access to the system, it only affects systems in specific ways - it only works if the current user is an administrator, is currently logged in, and has authenticated the sudo command in the current log-in session. This problem appears to revolve around the way the system stores prior credentials for the sudo command. If you set the Mac's clock back to January 1, 1970, (the epoch, or logical 'beginning of time' for Unix systems), apparently you can use the sudo command to gain root access and use it without authenticating. Ars Technica has found that a flaw in OS X allows the use of the sudo command without the need for a password.

Normally the sudo command is off-limits to everyone except administrators, and even with administrative access it requires you supply your password to run.

#Sudo su without password full#

Once that is successfully done, you or your members of the specified group will never be asked for a password ever again.The sudo command is therefore quite powerful, as it can be used to bypass access permissions and give full access to information in one's account, or allow for modification of system files. The sudoers file will be automatically overwritten if the modified version has no syntax errors. Since I want to enable password-less sudo for my user named as pratham, I added the following line in my editor. If you want to enable this for a group, use the following syntax: %GROUPNAME ALL=(ALL:ALL) NOPASSWD:ALL In this syntax, the important part of this line is the NOPASSWORD part, it essentially allows ALL (only pratham) to run the sudo command without password. In the editor, add the following line at the very bottom, but before the #includedir statement. When you run the visudo command, your sudoers file (if not previously modified) will look very similar to mine. Hence, the sudo command is necessary if you are a non-root user. To run the visudo command, you must have superuser access. If everything seems okay, the /etc/sudoers file is overwritten by the temporary file and new changes are brought in effect. When you edit it, the changes will be written to the temporary file that was created in the /tmp directory and it is check for syntax errors. The visudo command will copy the /etc/sudoers file to a randomly named file in /tmp directory and open that in the Vi editor. This file should be edited only by the use of the visudo command. The sudoers file is a configuration file for the sudo command.

This is different than editing a regular text file in the command line. When your tasks are complete, you can exit out of the root user's shell by either pressing the Ctrl + D key combination or by typing the exit command. Once you are logged in as the root user, you can run any command that needs higher privilege without having to use the sudo command at all. The shell prompt for a normal user (in bash) is the dollar symbol ( $), and when you log in as root, your prompt will change to the hash symbol ( #). To log in as the root user, simply use the -i option with the sudo command. This is only a bit more secure and should be attempted with extreme caution. That is because you are still initially asked for the password when you log in as the root user. This method is slightly more secure than removing the password prompt altogether. That may not be the case in Ubuntu server where a dedicated root account with a password is set already. This works well on the Ubuntu desktop where the root user is not set and any sudo user can switch to the root user. Since you are logged in as the root user, you can do anything without the necessity of a password. The first method is to log in as the root user. Method 1: Temporarily log in as the root user Please consider your security threat model before going through with this. Following either method will reduce the level of security of your Linux installation.