Security updates for Thursday

([Security] Sep 6, 2018 13:55 UTC (Thu) (jake))

Security updates have been issued by Debian (curl, gdm3, git-annex, lcms2, and sympa), Fedora (discount, dolphin-emu, gd, obs-build, osc, tcpflow, and yara), openSUSE (wireshark), Slackware (curl, firefox, ghostscript, and thunderbird), SUSE (apache-pdfbox, curl, dovecot22, and libvirt), and Ubuntu (libtirpc).