From Canonical Ubuntu 16.04 Security Technical Implementation Guide
Part of SRG-OS-000259-GPOS-00100
Associated with: CCI-001499
If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process.
Verify the system commands contained in the following directories are group-owned by "root". Check that the system command files contained in the following directories are group-owned by "root" with the following command: # sudo find /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -group root | xargs ls -la If the command returns any files that are not group-owned by "root", and if they are not SGID and owned by a privileged group, this is a finding.
Configure the system commands to be protected from unauthorized access. Run the following command, replacing "[FILE]" with any system command file not group-owned by "root". # sudo chgrp root [FILE]
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