Security updates for Thursday

Security updates have been issued by CentOS (firefox, icu, kernel-rt, libvncserver, python-imaging, python-pip, python-virtualenv, thunderbird, tomcat, tomcat6, and zsh), Debian (icu and okular), Fedora (libxslt and php), Gentoo (bluez, chromium, pure-ftpd, samba, tor, weechat, xen, and zsh), Oracle (libvncserver), Red Hat (ipmitool and zsh), and SUSE (python-cffi, python-cryptography and python-cffi, python-cryptography, python-xattr).