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(vhost) via BNC (IRC Bouncer, basically an IRC proxy server) Thus, backtracing to a given IP may reveal not the user sitting behind a terminal, but rather the server running the BNC
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Although we really don t consider Napster and Wrapster a huge security threat at this time, we thought both products demonstrate the simple ethos of hacking on a grand scale and just had to talk about them in our book For those who already know what this is all about, jump to the next section If you haven t heard of one or either, take a gander, and then try it for yourself Regardless of how you feel about intellectual property and copyrights, the awesome convenience, selection, and instant gratification provided by Napster will surely expand your horizons Another example of the great potential for security conflagration brought about by the combination of power and popularity is the revolutionary distributed file-sharing network called Napster (http://wwwnapstercom) Napster is a variation on a typical client-server file-sharing tool in which the server acts as a centralized index of MP3 audio files that exist on the hard drives of all the users connected to the network with the Napster client Users search the index for an MP3 that they wish to download, and the server connects their client directly to the user(s) who actually possesses the file(s) that matches the query Thus, all users who wish to participate in the bountiful goodness that is Napster must share out some portion of their hard drive and give read/write permission to others Napster attempts to keep non-MP3 files off the network to avoid potential spread of malware via the system It does this by checking the binary headers of files copied over the network and verifying that they resemble the MP3 header format Versions of Napster subsequent to beta 6 employ a new MP3 detection algorithm, one that checks for actual frames inside a file in addition to verifying the MP3 header Of course, the same human ingenuity that brought us Napster conceived of a way to smuggle non-MP3s over the network in short order Wrapster, by Octavian (http:// membersfortunecitycom/wrapster), hides file types, disguising them as legitimate MP3 files that are encoded at a specific bit rate (32 kbps bitrate), allowing it to be traded via the Napster network just like any other MP3 Users who want to see what s Wrapster-ized out there can simply search the Napster network for the bit rate defined earlier, and any available Wrapster files will pop up Or, if you know what files your friend is sharing out, you can simply search by name and bit rate We now have a distributed network where wildly popular music files trade hands like money and a mechanism for creating Trojans that resemble the music file format Anyone see a reason to be cautious here
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Fortunately, Wrapster requires users to first manually extract the faux MP3 file using a helper application before it can be executed Simply double-clicking on a Wrapster-encoded file will attempt to open it in the user s digital music player of choice, at which point it will be recognized as an illegitimate MP3 and fail to load This shifts the burden from the technology to the user to correctly identify whether the enclosed file is dangerous or not Once again, human judgment provides the only barrier between a great thing (free music) and a formatted hard disk So, if Napster is not a security concern today, it certainly illustrates how applications and people make assumptions, and how it may be possible to bypass assumptions We hope our discussion has encouraged further analysis of such assumptions and further use of Napster Various open-source clones of the Napster software package reportedly have a vulnerability by which an attacker could view files on a machine running a vulnerable Napster clone client (the official commercial version of Napster does not contain this vulnerability) See Bugtraq ID 1186 at http://wwwsecurityfocuscom and http://packetstormsecurifycom/0007-exploits/Xnapsterc
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