ftpd in OpenBSD 4.3, FreeBSD 7.0, NetBSD 4.0, Solaris, and possibly other operating systems interprets long commands from an FTP client as multiple commands, which allows remote attackers to conduct cross-site request forgery (CSRF) attacks and execute arbitrary FTP commands via a long ftp:// URI that leverages an existing session from the FTP client implementation in a web browser.
http://www.securitytracker.com/id?1021112
http://www.securitytracker.com/id?1020946
http://www.oracle.com/technetwork/topics/security/cpuoct2010-175626.html
http://www.openbsd.org/cgi-bin/cvsweb/src/libexec/ftpd/ftpd.c
http://www.openbsd.org/cgi-bin/cvsweb/src/libexec/ftpd/ftpcmd.y
http://securityreason.com/securityalert/4313
http://securityreason.com/achievement_securityalert/56
http://security.FreeBSD.org/advisories/FreeBSD-SA-08:12.ftpd.asc
http://secunia.com/advisories/33341
http://secunia.com/advisories/32070