Security updates for Tuesday

Security updates have been issued by CentOS (firefox, libssh2, and thunderbird), Debian (firmware-nonfree, kernel, and libssh2), Fedora (drupal7, flatpak, and mod_auth_mellon), Gentoo (burp, cairo, glusterfs, libical, poppler, subversion, thunderbird, and unbound), openSUSE (yast2-rmt), Red Hat (freerdp), and SUSE (bash, ed, libarchive, ntp, and sqlite3).