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Network enumeration is the process of identifying domain names and their associated networks. Enumeration involves querying whois databases and performing DNS lookups. Whois databases often hold names and contact information for people involved in managing a domain, and the date a domain was registered. The information gathered from these inquiries can be used to facilitate Social engineering attacks. Social engineering is the art of convincing network users to divulge private information (information they should not be giving out) about the network, such as IP addresses, usernames, and even passwords. In some cases, a lucky (or skillful) attacker only needs to ask a user nicely for their password.
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CHAPTER 17: Network Scanning, Intrusion Detection, and Intrusion Prevention Tools
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NOTE: DNS zone transfers are used to pass DNS information between DNS servers. Many environments are mistakenly configured to allow untrusted hosts to perform a DNS zone transfer, which means that any machine masquerading as a DNS server can request a zone transfer in order to obtain DNS information. You can find a wide variety of tools on the Internet that can be used to perform DNS interrogation. For more information on DNS security, see 16.
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Vulnerability and Port Scanning
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Scanning can be performed on a single host or a whole network. Scanning with a vulnerability scanner allows you to rapidly review your computer and the computers on your network for known security holes such as outdated software. You can then move on to penetration testing, which typically starts by going a step beyond scanning and into using automated tools that attempt to exploit vulnerabilities. Be very careful when trying to access any open ports you may find. Brute-forcing an FTP or a web server can land you in a pile of trouble. As a rule of thumb, if attempting to access a service requires a password, you probably shouldn t be there. In fact, in some jurisdictions, accessing a resource without permission is illegal, even when it is configured to allow anonymous access. However, if you access something important and the system doesn t ask you for a password, then this is a problem that should be resolved immediately.
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Nmap is a network exploration tool that can be installed on Mac OS X from nmap.org. It is one of the most valuable tools for a security engineer or penetration tester (someone who attempts to break into a system in order to test its security). It is, as its name suggests, a network mapping tool. With nmap, you can probe an entire network and discover which services are listening on each specific port on every workstation, server, and router accessible. Nmap can also perform operating system fingerprinting. By comparing different fingerprints, nmap gives users an educated guess as to the operating system a target machine is running. Nmap is very flexible, and offers a lot of options or flags that let you perform a wide variety of scans. For example, you can perform a TCP connect() scan (which initiates a full connection to the host) or a SYN scan (also known as a half connection). You can test firewall rules and distinguish whether you are scanning a firewall or a packet filter. You can also throw out decoys to make your real address harder to trace. Table 14-1 describes the nmap options for the actual binary command. The proper usage of nmap includes the following:
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nmap [Scan Type] [Options] <target(s)>
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CHAPTER 17: Network Scanning, Intrusion Detection, and Intrusion Prevention Tools
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Table 14-1. Common Scanning Options
Option
-sO -sS -sT -sU -sP --interactive -sR/ -O -p <range> -F -v -PN
Description
Scan for supported IP protocols rather than open ports. TCP SYN stealth port scan (default if running as root). TCP connect() port scan (default for nonroot users). UDP port scan. Ping scan (find any reachable machines). Interactive mode (then press H for help). RPC scan (use with other scan types). Use TCP/IP fingerprinting to guess remote operating system. Define ports to scan. Example range: 1-80, 8010, 8080, 10000. Scans only ports listed in nmap-services to speed up scans. Verbose. Its use is recommended. Use twice for greater effect. Don t ping hosts before scanning (needed to scan www.microsoft.com and others). Hide scan using decoys. Scans via IPv6 rather than IPv4. General timing policy. Settings are Paranoid, Sneaky, Polite, Normal, Aggressive, Insane. Do not use DNS resolution/always resolve (the default is to sometimes resolve). Output normal/XML/grepable scan logs to <logfile>. Get targets from file; use - for stdin. Specify source address or network interface.
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