I find netcat the best tool for banner grabbing. If you have messed around with method than you must be aware that you can read and write data across a network very easily and you can also connect to servers with a normal tcp stream and send strings for your own needs. we’re interested in knowing what’s running behind port 80 and 21.
We can use Netcat to grab port banners in the following way:
So we know it’s probably a Windows 2000 machine as it’s running IIS 5.0 and Microsoft FTP Service.
Let’s try to send a malformed URL which attempts to exploit the File Traversal vulnerability in unpatched IIS servers (Pre SP3). We will be using Netcat to Check for the vulnerability, and if found (and it will!), we will upload Netcat to the IIS server and demonstrate how we can use Netcat as a backdoor.
If you do not know what the Unicode File traversal exploit is, you can check the “IIS Unicode File Traversal” tutorial, or read it up on the net.
Basically this exploit allows us to “break out” of C:inetpubwwwroot and explore and execute programs anywhere on the attacked machine.
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Hope this assists.
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