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_SHOW );
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