System commands must have mode 0755 or less permissive.

From Canonical Ubuntu 16.04 Security Technical Implementation Guide

Associated with: CCI-001499

SV-90291r2_rule System commands must have mode 0755 or less permissive.

Vulnerability discussion

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.This requirement applies to Ubuntu operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals shall be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Check content

Verify the system commands contained in the following directories have mode "0755" or less permissive. Check that the system command files contained in the following directories have mode "0755" or less permissive with the following command: # find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin -perm /022 | xargs ls -la If any system commands are found to be group-writable or world-writable, this is a finding.

Fix text

Configure the system commands to be protected from unauthorized access. Run the following command, replacing "[FILE]" with any system command with a mode more permissive than "0755". # sudo chmod 0755 [FILE]

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