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Type of service (TOS) For ICMP port unreachable messages, the TOS is examined Most stack implementations use 0, but this can vary Fragmentation handling As pointed out by Thomas Ptacek and Tim Newsham in their landmark paper Insertion, Evasion, and Denial of Service: Eluding Network Intrusion Detection, different stacks handle overlapping fragments differently Some stacks will overwrite the old data with the new data, and vice versa, when the fragments are reassembled By noting how probe packets are reassembled, you can make some assumptions about the target operating system TCP options TCP options are de ned by RFC 793 and more recently by RFC 1323 (http://wwwietforg/rfc/rfc1323txt) The more advanced options provided by RFC 1323 tend to be implemented in the most current stack implementations By sending a packet with multiple options set such as no operation, maximum segment size, window scale factor, and timestamps it is possible to make some assumptions about the target operating system Nmap employs the techniques mentioned earlier (except for the fragmentation handling and ICMP error message queuing) by using the O option Let s take a look at our target network:
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[root] nmap -O 192168110 Starting nmap V 468 by fyodor@insecureorg Interesting ports on shadow (192168110): Port State Protocol Service 7 open tcp echo 9 open tcp discard 13 open tcp daytime 19 open tcp chargen 21 open tcp ftp 22 open tcp ssh 23 open tcp telnet 25 open tcp smtp 37 open tcp time 111 open tcp sunrpc 512 open tcp exec 513 open tcp login 514 open tcp shell 2049 open tcp nfs 4045 open tcp lockd TCP Sequence Prediction: Class=random positive increments Difficulty=26590 (Worthy challenge) Remote operating system guess: Solaris 25, 251
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By using nmap s stack fingerprint option, we can easily ascertain the target operating system with precision The accuracy of the determination is largely dependent on at least one open port on the target But even if no ports are open on the target system, nmap can still make an educated guess about its operating system:
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[root]# nmap -p80 -O 10101010 Starting nmap V 468 by fyodor@insecureorg Warning: No ports found open on this machine, OS detection will be MUCH less reliable No ports open for host (10101010) Remote OS guesses: Linux 2027 - 2030, Linux 2032-34, Linux 2035-36, Linux 2124 PowerPC, Linux 2176, Linux 2191 - 21103, Linux 21122 - 21132; 220-pre1 - 222, Linux 220-pre6 - 222-ac5 Nmap run completed -- 1 IP address (1 host up) scanned in 1 second
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So even with no ports open, nmap correctly guessed the target operating system as Linux (lucky guess) One of the best features of nmap is that its signature listing is kept in a file called nmap-os-fingerprints Each time a new version of nmap is released, this file is updated with additional signatures At this writing, there are hundreds of signatures listed Although nmap s TCP detection seems to be the most accurate as of this writing, the technology is not flawless and often provides only broad guesses that at times seem less than helpful But despite the challenges, it was not the first program to implement such techniques Queso is an operating system detection tool that was released before Fyodor incorporated his operating system detection into nmap It is important to note that queso is not a port scanner and performs only operating system detection via a single open port (port 80 by default) If port 80 is not open on the target server, it is necessary to specify an open port, as demonstrated next, using queso to determine the target operating system via port 25:
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