Essay About Transfer Control Protocol And Internet Protocol

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Exploiting File and Print Sharing, by:
Ghost_Rider ([email protected])
R a v e N ([email protected])
Date of Release: 2/4/2000
Thanks to Oggy, a totally kewl and helpful guy that helped us release this
tutorial faster.
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Introduction
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Remember that I wont go into much detail, because it could start getting
too complicated to explain to newbies. This is a newbies guide after all. If
you want more detailed information about file sharing search the web, or
read some good NT networks administration books.
Windows has an option called file and print sharing. You can use this
option in order to “share” drive and printers, which means giving access to
files and printers to other people – people on your own network, specific
IPs or even the whole world. When you turn this option on, you leave an open
port (port number 139) that accepts connections and understand the “NetBIOS
protocol”, a set of commands (a “language”) used to access remote file
and print sharing servers, so that other computers can access the files or
printers you decided to share.
Now sometimes in a small company LAN this could be extremely useful. For
example, instead of having a separate
printer for each computer, theres just
one central printer in a computer that allows file and print sharing. But if
you are using file sharing in your home computer (Weve seen many people
that have this option turned on and dont even know what it means! Poor
souls) that is connected to the Internet, that could be quite dangerous because
anyone who knows your IP can access your files or printers youre sharing.
If you dont know if file sharing is active in your computer just go to the
control panel and select the Network icon. Now you should see a box where you
can see all the network software that you have installed, such as TCP/IP
(Transfer Control Protocol / Internet Protocol. This is the protocol that is
used to transfer data packets over the Internet. A protocol is like a human
language – if two computers understand it, they can communicate) and probably a
dial-up adapter (so you could transfer TCP/IP packets over a PPP connection.
PPP, or Point to Point Protocol is the protocol used in dial-up connections),
check if you have a line called File and Printer Sharing.
If you have this then you have sharing activated, to turn it off just uncheck
the “I want to be able to give others access to my files” and do the same to
the other. Lets return to the ports thing. Remember port 139? The File Sharing
Port is port 139 and its called NetBIOS Session Service port. When you have
this option enabled you also have 2 other ports open but they use the UDP
protocol instead of the TCP protocol. These ports are 137 (Name Service) and
138 (Datagram Service). Now if you know anything about DoS attacks (known to
many as nukes) port 139 should sound familiar Theres a kind of DoS (stands
for Denial of Service) attack called the OOB nuke (OOB stands for Out Of Band)
or “winnuke” that sends an