Ensure sudo commands use pty

MediumLevel 1Automatedros

Description

sudo can be configured to run only from a psuedo-pty The audit requires "Defaults use_pty" in /etc/sudoers or /etc/sudoers.d/*. Host-level control from the CIS ROS Melodic benchmark (Ubuntu 18.04 robot hosts); run as root.

How it is checked

Audit method: Shell command

shell

grep -Pqs -- '^\s*Defaults\s+([^#]+,\s*)?use_pty(,\s*\S+\s*)*(\s+#.*)?$' /etc/sudoers /etc/sudoers.d/* && echo compliant || echo 'Defaults use_pty is not set'

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

edit the file /etc/sudoers or a file in /etc/sudoers.d/ and add the following line: Defaults use_pty

Properties

Operating systems: Any
Tags: rosros1melodicsystem
Reference: CIS ROS Melodic Benchmark v1.0.0 - 1.3.2 Ensure sudo commands use pty

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target ros