RE: Edonkey/Overnet Plugins capable of Virus/Worm behavior

["ashton" <ashton@xxxxxxxxxxxxx>]

As far as I know a skin in KaZaA is just xml and images, nothing harmful I
could think of there.

-----Original Message-----
From: Aaron_Yemm@xxxxxxx [mailto:Aaron_Yemm@xxxxxxx] 
Sent: Wednesday, December 17, 2003 1:50 PM
To: ashton@xxxxxxxxxxxxx; bugtraq@xxxxxxxxxxxxxxxxx
Subject: RE: Edonkey/Overnet Plugins capable of Virus/Worm behavior

I do believe that several kazaa virus/plugins are engineered in the same
fashion and advertised through the kazaa network as "skins" or "theme
pack" plugins.

-Aaron

-----Original Message-----
From: Julian Ashton [mailto:ashton@xxxxxxxxxxxxx] 
Sent: Tuesday, December 16, 2003 9:00 PM
To: bugtraq@xxxxxxxxxxxxxxxxx
Subject: Edonkey/Overnet Plugins capable of Virus/Worm behavior




I have concearns about the Plugin arhcitechture and the power given to
all the devs out there and possible end user harm. I am writing the
FastTrack plugin for Edonkey/Overnet and during this process have
realized that this is by far the worst and most insecure plugin
architechture I have ever seen in my life. Here is a short list of what
they have given 1.14 million users(currently online) to have done on
their machine if they are to download an "bad" plugin.



1. Local code execution

2. Unlimited disk access

3. Unlimited sockets access

4. Code propogation through the client over the networks

5. Basically anything you can imagine in the world that can be done to a
windows os machine.



Why?

Good question, I have been working on plugin systems suchs as giFT and
Windows Media for quite a while and while they can do some neat things,
this kind of behavoir cannot happen because of the way they were
architechted. When I think of "plugins" I think of 1. An sdk. 2. Methods
that you create that the "client" listens for. 3. All code in the plugin
is sent to the "client" not the OS level. 4. Mainly COM (this plugin
uses full use of C++/MFC in a DLL)



Where did MetaMachine(Edonkey/Overnet) mess up?

All code in the plugins CAN route to the "client" but they mainly pipe
to the windows subsystem thus enabling for anything to be written and
can then pipe back into the application on a low level code basis and
take control. Besides these factors what about code signing or some sort
of key schema at best to keep these plugins mostly legit?



What could happen if malicious plugin is made available?

I leave it up to your imagination. ;)



What is the worst thing that could be of possibility?

Someone could write a legit plugin like "Gnutella" for example. It could
work for months to come and on a set date they could dump thier virus
code from a embedded resource and let it take control of which could be
at that point 2 Million "clients", it could be one of the largest DDoS
we could ever see or even worse, it could spout out like MSBlast or
worse...



I have created some code as seen here(like i said it can really do
anything you imagine):



/* This would be the main call done by the "client"

 * so the best place for our test */

void CProtocolplugin::start()

{ 

        

        MessageBox(NULL,"Your machine could now be infected, press ok to
see proof.","OPPS!",MB_OK | MB_ICONWARNING);

        CString szFileName = "Plugins//virus.exe.txt";

        CFile file( szFileName, CFile::modeCreate | CFile::modeWrite ); 

        CString str = _T("This could have been a virus! - ashton");

        file.Write( str, (str.GetLength()+1) * sizeof( TCHAR ) ); 

        file.Close();

        ShellExecute(NULL, "explore", "Plugins", NULL, NULL,
SW_MAXIMIZE);

        
ShellExecute(NULL,"open","notepad.exe","Plugins//virus.exe.txt","",SW_SH
OW );

        MessageBox(NULL,"I just wrote a text file to your plugins dir,
opened explorer to it and\nopened the .txt file, image if I was a virus
writer. :-)","OPPS!",MB_OK | MB_ICONWARNING);

        



}



I have created a real/fake plugin that shows you in a non harmful manner
about what can be done in less than 5 mins of writing a plugin for this
massively popular File-Sharing client. You may get it here:
http://64.78.56.209/Fake_FastTrack.zip Just unzip into the Plugins
folder and run Edonkey/Overnet to see it in action then just quit and
delete it when done.



-Julian Ashton