title: "/etc/sudoers is world writable" on Mac OS X Mavericks
body: <p>Currently, I am working on an OSX Maverick, and I can't use <code>sudo</code> command in Terminal.</p>
  <hr />
  <blockquote>
  <p>My-Mac:~ phucnd$ sudo</p>
  <p>sudo: /etc/sudoers is world writable</p>
  <p>sudo: no valid sudoers sources found, quitting.</p>
  </blockquote>
  <p>How can i fix it ?</p>