This bug was fixed in the package lxc - 0.9.0-0ubuntu3.7

---------------
lxc (0.9.0-0ubuntu3.7) raring-proposed; urgency=low

  * debian/rules and debian/lxc.postinst: set /var/lib/lxc and /var/cache/lxc
    to be perms 700.  That prevents unprivileged users from running setuid-root
    applications.  Install that way by default, and for any previous versions,
    update the permissions.  After this version, respect the user's choice.
    (LP: #1244635)
  * 0112-ubuntu-Improper-pty-permissions.patch: fix permissions with which
    devpts is mounted in containers.  (LP: #1242913)
 -- Serge Hallyn <serge.hal...@ubuntu.com>   Tue, 29 Oct 2013 13:45:17 -0500

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https://bugs.launchpad.net/bugs/1244635

Title:
  setuid executables in a container may compromise security on the host

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