Multiple argument injection vulnerabilities in Mozilla Firefox 2.0.0.5 and 3.0alpha allow remote attackers to execute arbitrary commands via a NULL byte (%00) and shell metacharacters in a (1) mailto, (2) nntp, (3) news, (4) snews, or (5) telnet URI, a similar issue to CVE-2007-3670.
https://bugzilla.mozilla.org/show_bug.cgi?id=389580
https://bugzilla.mozilla.org/show_bug.cgi?id=389106
http://xs-sniper.com/blog/remote-command-exec-firefox-2005/
http://xs-sniper.com/blog/2007/07/24/remote-command-execution-in-firefox-2005/