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We ve talked a lot to this point about port scanners from the perspective of a UNIX user, but does that mean Windows users can t join in all the fun Of course not the following port-scanning tools have risen to the top of our toolbox because of their speed, accuracy, and feature set
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SuperScan from Foundstone can be found at http://wwwfoundstonecom Over the years, it has become one of the fastest, most reliable, and most flexible Windows port scanners becoming the de facto tool for assessment projects Unlike almost every other port scanner, SuperScan is both a TCP and UDP port scanner that comes at a great price free! It allows for flexible specification of target IPs and port lists As you can see in Figures 2-5 and 2-6, the tool allows for ping scanning, TCP and UDP port scanning, and includes numerous techniques for doing them all SuperScan allows you to choose from four different ICMP host-discovery techniques, including traditional Echo Requests and the less familiar Timestamp Requests, Address Mask Requests, and Information Requests Each of these techniques can deliver various findings that can add to the definitive live host list Additionally, the tool allows you to choose the ports to be scanned, the techniques for UDP scanning (including Data, Data+ICMP, and static source port scanning), and the techniques for TCP scanning (including SYN, Connect, and static source port scanning)
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Figure 2-5 SuperScan has numerous host discovery techniques that become powerful allies in the digital battle eld
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The UDP Data scanning technique sends a data packet to the UDP port and, based on the response, determines whether the packet is open or closed This method is incredibly accurate but it does require a valid nudge string to be known by the product So if the UDP port is an esoteric service, you may not be able to detect it being open Using the Data+ICMP technique takes the Data technique to the next level of accuracy, including a greatly enhanced traditional UDP scanning technique that sends multiple UDP packets to a presumed closed port Then, based on the system s ability to respond with ICMP packets, it will create a window in which to scan the target port This technique is incredibly accurate and will find all ports that are open, but it can take some time to complete So be sure to plan for this added scanning time when selecting this option
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Figure 2-6 The SuperScan tool provides a number of different assessment tools, many of which are discussed in other chapters
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WUPS
The Windows UDP Port Scanner (WUPS) hails from Arne Vidstrom at http://ntsecurity nu It is a reliable, graphical, and relatively snappy UDP port scanner (depending on the delay setting), despite the fact that it can only scan one host at a time for sequentially specified ports It is a solid tool for quick-and-dirty single-host UDP scans, as shown in Figure 2-7
ScanLine
And now for (another) completely biased Windows port scanner recommendation: ScanLine from Foundstone is arguably the fastest, most robust port-scanning tool ever
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Figure 2-7 The Windows UDP Port Scanner (WUPS) nails a system running SNMP (UDP 161)
built The tool has a myriad of options, but one of its most valuable features is its ability to scan very large ranges quickly and to include both TCP and UDP scanning in a single run of the product Take a look at this example:
C:\ >sl -t 21,22,23,25 -u 53,137,138 19216801 ScanLine (TM) 101 Copyright (c) Foundstone, Inc 2002 http://wwwfoundstonecom Scan of 1 IP started at Fri Nov 22 23:09:34 2002 ---------------------------------------------------------19216801 Responded in 0 ms 1 hop away Responds with ICMP unreachable: No TCP ports: 21 23 UDP ports: ---------------------------------------------------------Scan finished at Fri Nov 22 23:09:46 2002 1 IP and 7 ports scanned in 0 hours 0 mins 1207 secs
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