4 Vulnerabilities in GamePort
Exploit Tested On :
GamePort 4.0
GamePort 3.1
GamePort 3.0
Platform :
Windows 9X/Me/2K/XP
Background of Program :
Gameport is a product of interactivestudio(www.interactivestudio.sk). it
is very Common Program in Iran(My Country) that is used for Gamenets and
Coffenets. It has to Parts Client and Server. Each Costomer of Coffenet or
Gamenet has an ID and a Password and by his ID and password he can access one
of PCs in the Gamenet or Coffeenet. The user credits will be count down from
time he will log in to system GamePort untill he will log out. In the case the
users credits has expired the computer will be restarted and he can logon again
after he buy a new credits.(more Informations in www.interactivestudio.sk)
Type of Vulnerability:
Remote/Local Critical
Descripttion :
we've found 4 Vulnerability
Vul I :
When Client is not Logged in, in ID textbox Put your username and in
Password textbox Put your password and "^^#LOGOFF#" for example :
ID : 101
Password : 123^^#LOGOFF#
then you will login and you can use the Client PC and the Server wont
count down your credits.
Vul II :
the admin Password of server is reversable, it means that You can easily
decode the password recorded in registry. we've programmed a decoder for admin
password of server. you may download the source(in VB) here :
http://www.sharemation.com/devilkins/GPSPDecoder.zip
***Other Vulnerabilities is Only for Version 4.0***
Vul III :
In Case you have access to Server's PC(the PC have GamePortserver
installed) but you don't have the admin password you can change the clients
password Or you can call an application on the Clients(Pcs that have Gameport
Client installed) remotly without admin password. just push right click on
mouse over icon of client pc in the main window of Gameport server, that we
want to Call an application on or change it's admin password. After this the
menu appear, where we choose item "Send message to user...". Now the window
will appear where we can write a message and send it by pushing button "Send".
in the Textbox type "^^#CALL#:application_name.exe" and push send that
application will run on the client. also you can change admin password by
typing "^^#CHANGEPSSWD#:New password" instead of message. for example :
"^^#CALL#:CMD.exe"
"^^#CHANGEPSSWD#:123"
Vul IV :
I don't Know why this Occurs.
In "Remore applictaion call" part of server If you type
"\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\.exe" or
"//////////////////////////////////////////////.exe" and Press OK. the Client
you've send the packet to it Will hang up for a Long time.
Analisis :
Vul I :
When you type your ID and password and "^^#LOGOFF#" at the end and press
the login key. a packet with this data will be sent to server :
"^#LOGME#:ID:Password^^#LOGOFF#:computername^"
it means that log me in and then log me off but when Client Logs off
doesn't perevnt your access.
Vul III:
after sending that message to client, that client will recive this data :
"^#ECHO#:^^#CALL#:CMD.exe^"
it means show "nothing" as message and Call CMD.exe application.
*****All Words Between ## are Capital*****
Solution :
We've Made a Patch for 3.0 & 4.0 Versions ourself, may be
Interactivestudio Gonna make a Patch for it in future but til they haven't
released it we try to sell our patch.
Credits:
amoXi & Dr.vaXin
am0xi@xxxxxxxxx
GrayDevilkins Team