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Extra info for 2600 Magazine - The Hacker Quarterly (Autumn 2012)
14 Top Level Directory with Cloaked Files CONCLUSION The file system in any computer is crucial to the security of that system. Not only is it the repository for the operating system and all users data, it’s also the perfect location to hide information. And there are a ton of places we can hide that information, if we just understand our options. We started the chapter by defining a file system, and explaining its history. There have been a number of evolutions over the decades, most notably due to increases in hardware and software capabilities.
In the example below we ran a normal Nmap scan of our OS X host with the server application running. It is interesting to note that the OS X firewall was running during our scan and the open ports listed in scan were exposed to the network unfiltered. 19). nmap target (hostname or IP Address/range) This type of basic scan will run incredibly fast as it scans the 1000 most common service ports and uses the TCP Syn scan technique to attempt to determine if the port is open. Another common term for this type of scan is a half-open scan as the TCP connection is never completed and therefor more difficult to detect by some IDS products.
Inside this expanded section we can see that it is indeed a POST request (information has been submitted to the Webserver via a form on some page) and a lot of other very useful information. From this unencrypted communication we can see several things the user wants to hide from us, including the sessid which we might be able to replay, the Webmail_des_key which could be interesting, and a field called Line-based text data. Expanding this Line-based text data field, we can see this looks a considerable amount like a variable string submitted to a Webserver in a POST or GET request.