Kali Linux Wireless Penetration Testing Essentials: Plan and execute penetration tests on wireless networks with the Kali Linux distribution

The planning phase is a crucial part of penetration testing, though it is not always given the importance that it should have. In this phase, we define the scope and the so-called rules of engagement of a penetration test, as a result of an agreement between the penetration testers and the client that will be formalized in a contract between the two parties. It must be clear that a penetration tester should never operate without a contract or outside the scope and the rules of engagement established in the contract, because otherwise he/she could stumble into serious legal troubles. The scope is about which networks to test and the goals and objectives the client wants to achieve with the penetration test.

In this, we need to consider, for example, the area to scan for wireless networks, the coverage range of the signal of the networks to test, and their size in terms of the number of clients that will supposedly be connected. We also define the objectives of the test, such as specific vulnerabilities that should be assessed and their priorities; whether rogue and hidden access points should be enumerated and whether wireless attacks against clients should be conducted.

The rules of engagement include, among others, the estimated timeline and the days and times when to perform the test, the legal authorization from the client, the format of the report to produce, payment terms, and a nondisclosure agreement clause, according to which the results of the test are kept confidential by the testers.

Once the scope and rules of engagement are established, the penetration testing team defines the resources and the tools to employ for test execution.

In the discovery phase, we collect as much information as possible about the networks that are in the scope of the penetration test. This phase is also called the information gathering phase and it is very important because it precisely defines the targets of our test and allows to collect detailed information about them and to expose their potential vulnerabilities.

In particular, for our scope, we would collect information such as:

The discovery phase could be realized through two main types of wireless network scanning, active and passive. Active scanning implies sending out probe request packets to identify visible access points, while passive scanning means capturing and analyzing all wireless traffic and also allowing to uncover hidden access points.

We will see more about wireless scanning and how to use the wireless scanners included in Kali Linux, such as airmon, airodump, and Kismet, to carry out the discovery phase of wireless penetration testing in Chapter 3, WLAN Reconnaissance.

The attack phase is the most practical part of the penetration testing process, where we try to exploit the vulnerabilities identified in the discovery phase to gain access to the target networks.

This is called the exploitation subphase and in our case could involve attempting to crack authentication keys to connect to the network, setting up rogue and honeypot access points and directly attacking clients to recover the keys. The next stage (if required in the contract) is referred to as post-exploitation and involves attacking the network and the infrastructure after we have gained access to it, for example, taking control of the access points and performing man-in-the-middle attacks against the clients.

It is worth repeating that we should never conduct attacks that are not explicitly required in the contract. Moreover, the attack phase should be performed according to the terms and modalities established with the client, defined in the rules of engagement. For example, if the targets are production systems or networks, we could agree with the client to conduct such attacks outside the working hours, as wireless connectivity and the services provided may be disrupted.

We will cover the attack phase from Chapter 4, WEP Cracking to Chapter 7, Wireless Client Attacks.

Reporting is the final phase of penetration testing. The previous phases are very important because they are where we plan and execute the test but it is still important to communicate its results and findings in an effective manner to the client. The report is useful as a reference point for defining countermeasures and mitigation activities to address the identified vulnerabilities. It is usually formed by two major sections, the executive summary and the technical report.