fedup 0.9.0 in Fedora 19, 20, and 21 uses a temporary directory with a static name for its download cache, which allows local users to cause a denial of service (prevention of system updates).
www.securityfocus.com/bid/70874
bugzilla.redhat.com/show_bug.cgi?id=1066679
github.com/wgwoods/fedup/issues/44
lists.fedoraproject.org/pipermail/package-announce/2014-November/141698.html
lists.fedoraproject.org/pipermail/package-announce/2014-November/142698.html
lists.fedoraproject.org/pipermail/package-announce/2014-November/142933.html