Hello BUGTRAQat_private, mirror is a Perl script which is widely used for making copy of remote FTP site. It's included in FreeBSD packages. There are security holes, which allows overwrite local files from remote ftp site with permissions of the user who uses mirror. Then retrieving directory listing mirror doesn't check filename or directory name to contain ".." or "\" This allows to create or overwrite files in directory different from destination. To simply test this bug you can create " .." directory on your ftp site and mirror your site. Mirror will create temporary files in directory one level higher then specifyed. This way you couldn't overwrite some useful information, but this may be used, for example, to fill out / directory (if mirror is ran from root). But with putting little changes into you ftpd (for example making him change '\' to '/' on listings) you can force mirror to overwrite _any_ file with permissions of mirror user then he mirrors your ftp site. Tested with: $ mirror -v $Id: mirror.pl,v 2.9 1998/05/29 19:01:07 lmjm Exp lmjm $ /\_/\ { . . } |\ +--oQQo->{ ^ }<-----+ \ |Здесь был U Ученый Кот} +-------------o66o--+ / |/ Особую проблему составляет алкоголизм. (Лем)
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