http://seclists.org/fulldisclosure/2011/Nov/452
tested against: FreeBSD-8.2,8.1,7.2,7.1 i386;
FreeBSD-6.3 i386
FreeBSD-5.5,5.2 i386
FreeBSD-8.2 amd64
FreeBSD-7.3, 7.0 amd64
FreeBSD-6.4, 6.2 amd64
Requirements: a valid user account in chroot'ed environment or ftp anonymous user with write access in home directory
не проверял, фри нигде нет