Ron has configured his network to provide strong perimeter security. As part of his network architecture, he has included a host that is fully exposed to attack. The system is on the public side of the demilitarized zone, unprotected by a firewall or filtering router.
What would you call such a host?

What is Cygwin?

Rebecca is a security analyst and knows of a local root exploit that has the ability to enable local users to use available exploits to gain root privileges. This vulnerability exploits a condition in the Linux kernel within the execve() system call. There is no known workaround that exists for this vulnerability. What is the correct action to be taken by Rebecca in this situation as a recommendation to management?

After studying the following log entries, how many user IDs can you identify that the attacker has tampered with?

1. mkdir -p /etc/X11/applnk/Internet/.etc

2. mkdir -p /etc/X11/applnk/Internet/.etcpasswd

3. touch -acmr /etc/passwd /etc/X11/applnk/Internet/.etcpasswd

4. touch -acmr /etc /etc/X11/applnk/Internet/.etc

5. passwd nobody -d

6. /usr/sbin/adduser dns -d/bin -u 0 -g 0 -s/bin/bash

7. passwd dns -d

8. touch -acmr /etc/X11/applnk/Internet/.etcpasswd /etc/passwd

9. touch -acmr /etc/X11/applnk/Internet/.etc /etc

Which of the following snort rules look for FTP root login attempts?

John is discussing security with Jane. Jane had mentioned to John earlier that she suspects an LKM has been installed on her server. She believes this is the reason that the server has been acting erratically lately. LKM stands for Loadable Kernel Module.

What does this mean in the context of Linux Security?

Rebecca has noted multiple entries in her logs about users attempting to connect on ports that are either not opened or ports that are not for public usage. How can she restrict this type of abuse by limiting access to only specific IP addresses that are trusted by using one of the built-in Linux Operating System tools?

WinDump is a popular sniffer which results from the porting to Windows of TcpDump for Linux.
What library does it use ?

Jim’s organization has just completed a major Linux roll out and now all of the organization’s systems are running the Linux 2.5 kernel. The roll out expenses has posed constraints on purchasing other essential security equipment and software. The organization requires an option to control network traffic and also perform stateful inspection of traffic going into and out of the DMZ.

Which built-in functionality of Linux can achieve this?

You have just installed a new Linux file server at your office. This server is going to be used by several individuals in the organization, and unauthorized personnel must not be able to modify any data.

What kind of program can you use to track changes to files on the server?