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HackNotes (tm) Linux and Unix Security Portable Reference by Nitesh Dhanjani

By Nitesh Dhanjani

HackNotes Linux and Unix safeguard transportable Reference supplies step by step information of intrusion strategies, instruments, and real strategies getting used through hackers and criminals this day to damage into desktop networks. This booklet will train you the way to guard and harden Linux and Unix hosts opposed to the main tricky safeguard concerns. discover ways to use the most recent hacking instruments, together with Airsnort, Dsniff, Ettercap, airy, Kismet, Netcat, and Nmap. safeguard the preferred 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, unsuitable enter validation, and misconfigurations. Use the original and easy-to-access Reference heart in the course of the booklet to fast find precious instructions, on-line defense assets, and extra!

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Reference Center Conferences and Events RC 20 Reference Center USEFUL NETCAT COMMANDS Netcat is a command-line tool that reads and writes data across networks using the TCP and UDP protocols. It is known as the “network Swiss army knife” because of the many different functions it can perform. The following table provides a quick usage guide for the most useful Netcat commands. Netcat uses the TCP protocol by default. The –u flag can be used with many of the commands in the following table in order to make Netcat use UDP instead.

Such statistics are mostly password protected and can contain confidential information and URLs. Search engines can be used to find misconfigured hosts, which serve such data. com/ may expose the location of web servers that have been misconfigured to serve server statistics to unauthenticated external entities (see Figure 1-2). Figure 1-2. com Chapter 1: Footprinting 7 Locating Protected Data Resources joe:lWjdCijcQwGFA admin:XrouH05qTMlU. com/john/. Looking Through Configuration Files for Sensitive Information Various configuration files containing information such as passwords, secret keys, usernames, internal IP addresses, and other sensitive data are mistakenly served by various web servers when placed within the web root directory.

This first chapter covers different ways and techniques of gathering such information, including the use of search engines and of domain and network block registrars. Though the least glamorous aspect of hacking methodology, the process of footprinting is an important first step. F SEARCH ENGINES Search engines can be used to find interesting details and links that may lead to sensitive information. Since queries are performed on the search engine’s database, they are not noticeable in the target web server’s logs unless a resulting URL is accessed directly.

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