Download Hacking Exposed: Network Security Secrets & Solutions by Jean Letessier, Johann Rafelski PDF

By Jean Letessier, Johann Rafelski

The recent variation of this strong best-seller incorporates a CD-ROM with hyperlinks to safeguard instruments pointed out within the booklet, key protection instruments for obtain from the CD, and a password database. contained in the publication, you are going to additionally get all-new safeguard info on 802.11 (Wireless) hacking, home windows XP, Windows.NET Server (code named Whistler), and IIS 5--plus an awful lot extra!

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Extra resources for Hacking Exposed: Network Security Secrets & Solutions

Example text

Let’s take a look at an example and discuss some tools that make NFS probing more useful. Let’s examine our target system to determine if it is running NFS and what file systems are exported, if any.

How can attackers gain shell access to the target system? Good question. Let’s create a scenario and explore multiple ways attackers can gain interactive shell access to a UNIX system. Figure 8-1 illustrates these methods. vp Wednesday, September 20, 2000 10:21:30 AM 317 Color profile: Generic CMYK printer profile Composite Default screen 318 Hacking / Hacking Exposed: Network Security / McClure/Scambray / 2748-1 / Chapter 8 Hacking Exposed: Network Security Secrets and Solutions Figure 8-1. A simplistic DMZ architecture Suppose that attackers are trying to gain access to a UNIX-based web server that resides behind an industrial-based packet inspection firewall or router.

These metacharacters include but are not limited to \ / < > ! $ % ^ & * | { } [ ] “ ‘ ‘‘ ~ ; If a program or CGI script were to accept user-supplied input and not properly validate this data, the program could be tricked into executing arbitrary code. This is typically referred to as “escaping out” to a shell and usually involves passing one of the UNIX metacharacters as user-supplied input. This is a very common attack and by no means is limited to just PHF. There are many examples of insecure CGI programs that were supplied as part of a default web server installation.

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