4 NE TWORK SC ANN IN G, INTRUSION DETECTION, AN D IN TRUS ION PREVEN TION TOOLS in Font

Drawing QR in Font 4 NE TWORK SC ANN IN G, INTRUSION DETECTION, AN D IN TRUS ION PREVEN TION TOOLS

CHAPTER 1 4 NE TWORK SC ANN IN G, INTRUSION DETECTION, AN D IN TRUS ION PREVEN TION TOOLS
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nmap has a good number of options or flags that let you manipulate how it scans. For example, you can perform a tcp()connect scan (which makes a full connection to the host) or a SYN scan (also known as a half connection). You can test firewall rules and distinguish whether they are firewalls or packet filters. You can idle scan and spoof your IP through another machine. You can also throw out decoys to make your presence less traceable. Table 14-1 describes the nmap options for the actual binary command. The proper 4.53 usage of nmap includes the following: nmap [Scan Type(s)] [Options] <host or net list>
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Table 14-1. Common Scanning Options
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-sO -sS -sT -sU -sP --interactive -sR/-I -O -p <range> -F -v -PN -D decoy_host1,decoy2[,...] -6 -T <timing> -n/-R -oN/-oX/-oG <logfile> -iL<inputfile> -S <your_IP>/-e <devicename>
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Use raw packets. 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/Identd 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 (needed to scan www.microsoft.com and others). Hide scan using many 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/greppable scan logs to <logfile>. Get targets from file; use - for stdin. Specify source address or network interface.
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CH APT ER 14 NET W ORK SC ANN ING, I NT RUSI O N DE TEC TI O N, AN D I NT RUSI ON PRE VENT IO N T O OLS
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Here s an example: nmap -v -sS -O www.318.com 10.0.0.0/16 '10.0.*.*' The stealthiest and most widely used nmap-scanning method is SYN scanning, also known as half open or stealth scanning. There are a couple of downsides to using this method. Unfortunately, most intrusion detection systems (described more later in this chapter) can detect these packets, and some firewalls and packet filtration mechanisms will drop SYN packets, which make it harder to get a fingerprint of what ports the host is running. With a SYN/stealth scan, you do not actually make a full connection with the host. It will send a SYN packet and request a connection. The host being scanned then responds with a SYN/ACK packet informing you about whether the port is open and responding. As soon as you receive the SYN/ACK packet from the remote host, nmap sends one RST packet terminating the connection. It does not make a full connection or three-way handshake (full connection), which is why SYN/stealth scanning is called a half scan.
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Running a SYN/Stealth Scan
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Here is what an nmap SYN/stealth scan would typically look like. First we initialize the scan with the following Terminal command, assuming we are scanning a system with the IP address of 10.0.04: nmap -sS 10.0.0.4 This command results in the following output: Starting nmap 3.30 ( http://www.insecure.org/nmap/ ) at 2003-07-17 05:07 EST Interesting ports on 10.0.0.4: (The 1637 ports scanned but not shown below are in state: closed) Port State Service 21/tcp filtered ftp 22/tcp open ssh 23/tcp open telnet 111/tcp open sunrpc 139/tcp open netbios-ssn 1024/tcp open kdm 6000/tcp open X11 nmap run completed -- 1 IP address (1 host up) scanned in 3.194 seconds
Note A filtered port, such as the filtered FTP port 21, as it appears in the previous scan, usually indicates
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