(RHSA-2011:0414) Important: policycoreutils security update

The policycoreutils packages contain the core utilities that are
required for the basic operation of a Security-Enhanced Linux (SELinux)
system and its policies.

It was discovered that the seunshare utility did not enforce proper file
permissions on the directory used as an alternate temporary directory
mounted as /tmp/. A local user could use this flaw to overwrite files or,
possibly, execute arbitrary code with the privileges of a setuid or
setgid application that relies on proper /tmp/ permissions, by running that
application via seunshare. (CVE-2011-1011)

Red Hat would like to thank Tavis Ormandy for reporting this issue.

This update also introduces the following changes:

• The seunshare utility was moved from the main policycoreutils subpackage
  to the policycoreutils-sandbox subpackage. This utility is only required
  by the sandbox feature and does not need to be installed by default.

• Updated selinux-policy packages that add the SELinux policy changes
  required by the seunshare fixes.

All policycoreutils users should upgrade to these updated packages, which
correct this issue.