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Fingerprinting is the practice of gathering as much information as possible about your systems or network and using that information to positively identify the hardware and software in use. The goal is to get as much information as possible about a network or host s security, including its remote access capabilities, vulnerable services, and open ports. Successfully attacking a system depends on having this information. Tools that can be used in fingerprinting include general-purpose tools such as host, dig and traceroute, and specialized tools like nmap and Ethereal.
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CHAPTER 17: Network Scanning, Intrusion Detection, and Intrusion Prevention Tools
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The easiest and safest way to go about finding information about a company is to use publicly available information. This includes researching and collecting phone numbers, addresses, press releases, SEC filings, and other seemingly innocuous information. Company blogs are wonderful mediums for discussing technology, but they can also be a great resource from which to extract information about a company s infrastructure. Many companies post a great deal of information about themselves on their web site, including information about the systems they have deployed, the revisions of services running on these systems, and the security solutions used to protect these services. A lot of this information can be very useful to hackers. Let s fingerprint the site apress.com to find out as much as we can about our publisher. We can hopefully assume that, as a publisher of books on network security, they maintain good security practices. According to whois, the domain was registered in 1998. The administrative contact email address tnguyen@apress.com. We can glean from this that the format for apress.com e-mail address is first initial + last name. The current registrar for the domain is Network Solutions, and the technical contact address is customerservice@networksolutions.com. The authoritative DNS servers for the domain are owned by UUNet, which is a part of Verizon s network. See Figure 17 1.
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Figure 17 1. Using Network Utility to perform a whois lookup
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Next, let s find the IP address of www.apress.com. The host command performs both forward and reverse DNS lookups. Running it on www.apress.com returns the IP address 66.211.109.45. Running host on the IP address returns NXDOMAIN, which means there s no reverse DNS mapping for that address. Running whois on the IP address reveals that the address belongs to Evocative, Inc, a colocation and managed services provider in
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CHAPTER 17: Network Scanning, Intrusion Detection, and Intrusion Prevention Tools
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Northern California. A perusal of Evocative s web site reveals that this web server is probably running Linux. A cornerstone of fingerprinting is port scanning. Apple has provided a built-in port scanner with OS X, under the Port Scan tab of the Network Utility application (located in the /Applications/Utilities folder) Later in this chapter we will review nmap, a far more capable port-scanning utility. For now, open Network Utility, and click the Port Scan tab. Then, type www.apress.com in the search box, and let s see what services are running on that computer by clicking the Scan button. The most common and important services use the lower-numbered ports, so we ll limit our scan to only ports between 1 and 1000. Our results are as follows:
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Port Scan has started Port Scanning host: 66.211.109.45 Open Open Open Open Open Open Open Open Open Open TCP TCP TCP TCP TCP TCP TCP TCP TCP TCP Port: Port: Port: Port: Port: Port: Port: Port: Port: Port: 21 22 25 80 110 111 119 143 443 688 ftp ssh smtp http pop3 rpcbind nntp imap https unknown
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Port Scan has completed
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From this scan, we can see that www.apress.com has HTML and e-mail ports open, so it is either running or pretending to run mail services as well as web services. It s accepting RPC requests, and also has port 688 open, which is assigned for use by the ApplianceWare Management Protocol. ApplianceWare is a provider of Network Attached Storage solutions, and RPC is used for Network File System connections. We can now begin looking for potential exploits for these services.
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