An organization uses IP address block 203.0.113.0/24 on its internal network. At the border router, the network administrator sets up rules to deny packets with a source address in this subnet from entering the network, and to deny packets with a destination address in this subnet from leaving the network. Which of the following is the administrator attempting to prevent?
Correct Answer:
C
The IP address block 203.0.113.0/24 is used on the internal network. Therefore, there should be no traffic coming into the network claiming to be from an address in the 203.0.113.0/24 range. Similarly, there should be no outbound traffic destined for an address in the 203.0.113.0/24 range. So this has been blocked at the firewall. This is to protect against IP spoofing attacks where an attacker external to the network sends data claiming to be from an internal computer with an address in the 203.0.113.0/24 range.
IP spoofing, also known as IP address forgery or a host file hijack, is a hijacking technique in which a cracker masquerades as a trusted host to conceal his identity, spoof a Web site, hijack browsers, or
gain access to a network. Here's how it works: The hijacker obtains the IP address of a legitimate host and alters packet headers so that the legitimate host appears to be the source.
When IP spoofing is used to hijack a browser, a visitor who types in the URL (Uniform Resource Locator) of a legitimate site is taken to a fraudulent Web page created by the hijacker. For example, if the hijacker spoofed the Library of Congress Web site, then any Internet user who typed in the URL www.loc.gov would see spoofed content created by the hijacker.
If a user interacts with dynamic content on a spoofed page, the hijacker can gain access to sensitive information or computer or network resources. He could steal or alter sensitive data, such as a credit card number or password, or install malware. The hijacker would also be able to take control of a compromised computer to use it as part of a zombie army in order to send out spam.
Incorrect Answers:
A: BGP is a protocol used to exchange routing information between networks on the Internet. BGP route hijacking is the process of using BGP to manipulate Internet routing paths. The firewall configuration in this question will not protect against BGP route hijacking attacks.
B: Bogon is an informal name for an IP packet on the public Internet that claims to be from an area of the IP address space reserved, but not yet allocated or delegated by the Internet Assigned Numbers Authority (IANA) or a delegated Regional Internet Registry (RIR). The firewall configuration in this question will not protect against Bogon IP network traffic.
D: A man-in-the-middle attack is an attack where the attacker secretly relays and possibly alters the communication between two parties who believe they are directly communicating with each other. The firewall configuration in this question will not protect against a man-in-the-middle attack.
E: A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Amplified DDoS attacks use more systems to ‘amplify’ the attack. The firewall configuration in this question will not protect against a DDoS attack.
References:
http://searchsecurity.techtargHYPERLINK "http://searchsecurity.techtarget.com/definition/IPspoofing" et.com/definition/IP-spoofing
A security analyst is inspecting pseudocode of the following multithreaded application:
1. perform daily ETL of data
1.1 validate that yesterday’s data model file exists
1.2 validate that today’s data model file does not exist
1.2 extract yesterday’s data model
1.3 transform the format
1.4 load the transformed data into today’s data model file
1.5 exit
Which of the following security concerns is evident in the above pseudocode?
Correct Answer:
A
A server (10.0.0.2) on the corporate network is experiencing a DoS from a number of marketing desktops that have been compromised and are connected to a separate network segment. The security engineer implements the following configuration on the management router:
Which of the following is the engineer implementing?
Correct Answer:
B
Company XYZ has purchased and is now deploying a new HTML5 application. The company wants to hire a penetration tester to evaluate the security of the client and server components of the
proprietary web application before launch. Which of the following is the penetration tester MOST likely to use while performing black box testing of the security of the company’s purchased
application? (Select TWO).
Correct Answer:
CD
C: Local proxy will work by proxying traffic between the web client and the web server. This is a tool that can be put to good effect in this case.
D: Fuzzing is another form of blackbox testing and works by feeding a program multiple input iterations that are specially written to trigger an internal error that might indicate a bug and crash it. Incorrect Answers:
A: A Code review refers to the examination of an application (the new HTML5 application in this case) that is designed to identify and assess threats to the organization. But this is not the most likely test to be carried out when performing black box testing.
B: Application sandboxing refers to the process of writing files to a temporary storage are (the socalled sandbox) so that you limit the ability of possible malicious code to execute on your computer.
E: Port scanning is used to scan TCP and UDP ports and report on their status. You can thus determine which services are running on a targeted computer.
References:
Gregg, Michael, and Billy Haines, CASP CompTIA Advanced Security Practitioner Study Guide, John Wiley & Sons, Indianapolis, 2012, pp. 147, 154, 168-169, 174
The Chief Executive Officer (CEO) of a small start-up company wants to set up offices around the country for the sales staff to generate business. The company needs an effective communication solution to remain in constant contact with each other, while maintaining a secure business environment. A junior-level administrator suggests that the company and the sales staff stay connected via free social medi
Correct Answer:
B
Social media networks are designed to draw people’s attention quickly and to connect people is thus the main focus; security is not the main concern. Thus the CEO should decide that it would be ineffective to use social media in the company as it does not align with the company business. Incorrect Answers:
A: Social media is not designed to be easily adaptable to new situations in a workplace.
C: Social media does not necessarily make use of SSL encryption since it is designed to draw people’s attention and connect them quickly.
D: Social media, though a great channel for communication is not intended for business applications. References:
Gregg, Michael, and Billy Haines, CASP CompTIA Advanced Security Practitioner Study Guide, John Wiley & Sons, Indianapolis, 2012, pp. 290-293
