Sup before 0.13.2.1 and 0.14.x before 0.14.1.1 allows remote attackers to execute arbitrary commands via shell metacharacters in the filename of an email attachment.
rubyforge.org/pipermail/sup-talk/2013-August/004993.html
rubyforge.org/pipermail/sup-talk/2013-October/004996.html
secunia.com/advisories/55294
secunia.com/advisories/55400
www.debian.org/security/2012/dsa-2805
www.openwall.com/lists/oss-security/2013/10/30/2
github.com/sup-heliotrope/sup/commit/8b46cdbfc14e07ca07d403aa28b0e7bc1c544785