email_in.pl in Bugzilla 2.23.4 through 3.0.0 allows remote attackers to execute arbitrary commands via the -f (From address) option to the Email::Send::Sendmail function, probably involving shell metacharacters.
https://exchange.xforce.ibmcloud.com/vulnerabilities/36243
https://bugzilla.mozilla.org/show_bug.cgi?id=386860
http://www.vupen.com/english/advisories/2007/2977
http://www.securitytracker.com/id?1018604
http://www.securityfocus.com/archive/1/477630/100/0/threaded
http://www.bugzilla.org/security/2.20.4/
http://security.gentoo.org/glsa/glsa-200709-18.xml
http://secunia.com/advisories/26971