Thin client is the browser based application which is having database (server) only in the back end & there is no need to install thin client applications at the client side. Thick client are also known as fat client. Do note performing thick client sql injection needs patience and is a time consuming task. Most of the application processing will be done on the client side, and the database stores all the data processed by the client.This design is considered as insecure due to various possibilities of gaining access to database credentials along with exploiting other traditional thick client vulnerabilities within the application.The 3-tier architecture is a client-server architecture, where it consists of 3 different tiers as shown in the following figure.In this type of design, most of the processing is done on the server side and thus the risk is relatively lesser when compared to applications built using 2-tier architecture.To learn the Thick Client Application Penetration Testing concepts by practicing, it is important to have a lab where we can practice everything in a legal environment.DVTA application is developed using C#.NET in Microsoft Visual Studio. Even checking of certain parameters can be easily disabled with a value =yes with = no!Using reversing tools, executable file/ jar files can be decompiled which can be modified and repackaged.Here is a list of tools which are commonly used for performing thick client pentesting:That’s all readers for now. This article gave you a brief idea of how to go about testing an application.In upcoming articles we will cover the following yet not limited to topics:Hi Samrat, Can you list the tools you use for thick client testingWhy is two-tier inherently more vulnerable than three-tier?Samrat Das is an expert security consultant who deals with any problems given to him with ease. Closing Words. We will discuss more about the concept of obtaining clear text database password in later articles.In this article, we have set up a lab to practice thick client application penetration testing and then we discussed various information gathering techniques. Thick client applications are not new having been in existence for a long time, however if given to perform a pentest on thick clients, it is not as simple as a Web Application Pentest.Thick clients are majorly used across organizations for their internal operations.In this series of articles, we will learn various tools and techniques used to perform thick client application penetration testing.A step by step breakdown being deployed, we will discuss about starting with the very basics to the advanced test cases.Referenced under multiple names, such as: Fat client/Heavy client/Rich client/Thick client, such applications follow a client–server architecture.For an easy to understand approach, thick clients are applications which are deployed locally on our systems. We will discuss more about data storage issues later in this series.So let’s see if we can find anything interesting in DVTA’s current folder.The preceding figure shows the current directory where DVTA and all its dependencies are located. This is an interesting piece of information, which needs to be explored further. This machine acts as a database for DVTA application. It is important to follow them if you are using the compiled binary.After the installation is completed, create a database named DVTA.Now, we need to create two tables in DVTA database as shown in the following figures.Finally, run the following SQL queries to insert data into the users table. Even today, we can find a lot of legacy thick client applications being used by big companies. Such information is lethal for compromising the application. Thick Client: These applications are installed on client side although they are connected to server but almost all the processing happens at client side only. Thick client application follow Client-Server Architecture and they may have Two-Tier or Three-Tier Architecture.. Download the tool using the following link provided below.Load DVTA.exe using CFF EXPLORER and you will find the details about the binary as shown in the following window.As you can see in the preceding screenshot, the binary is built using Microsoft Visual Studio .NET. Though the database password is encrypted, there are multiple ways to get the clear text password. Such as skype/ outlook.Thick clients can be developed using multiple languages such as: .NET, C /C++, JavaA typical setup where a client and a database interacts with each other. We can use After applying the above filter, run DVTA application once using the test credentials. In this phase, we need to gather all the possible information about the target application.Some of the common things that we need to do during information gathering phase of thick client penetration test are as follows.It is essential to understand the complete functionality of the application during a pentest. Thick Client Penetration Testing – 3 covering the Java Deserialization Exploit Resulting Remote Code Execution. When developers follow secure SDLC practices and deploy them properly, thick-client applications can be highly secure from attacks. Decrypting the encrypted password using AES key and IV found in the config mentioned above file is one way to do it. They are different from a website where the user simply surf a URL in the browser and all the task are performed at the server end. We will never sell your information to third parties. Use the following credentials to a root directory of your choice (Make sure that the directory is writable). Also they are lightweight and do not occupy more space at the client system, whereas Thick client needs more storage space in order to install it on client side. You will not be spammed.Infosec Skills keeps your security skills fresh year-round with over 400 courses mapped to the National Initiative for Cybersecurity Education’s CyberSeek model.
You need to iterate multiple queries with a mix and match by observing response to each of them.You can crawl the net for multiple payloads to find the one which is appropriate for the application you are testing.Here our goal is to attempt to upload malicious files which can be injected into the application input request which can lead us to shell upload/ malicious code execution.Here you can simply check for all the browse buttons and check the file upload logic.Here our goal is to examine C / C++ programmed thick clients majorly to test the memory functions deployed which will allow us to check how the buffer overflow vulnerabilities and memory violations.The testing for this case involves checking whether encryption is applied for sensitive data on the wire or not (example: clear text data transmission is a vulnerability)This has multiple sub test cases which can involve privilege escalation, price tampering, authorization bypass etc.Tester tries in this case to extract verbose error messages which may give information about underlying framework, application code and log details.Test cases on session validity/ expiration/ fixation comes under this method.Many a times, configuration URLs can be directly connected via the web browserMost of the applications we test does not validate the timestamp directly accepting the local system time from user, performing malicious transactions via changing the system time leads to inconsistency of the application logs.Many times applications store username passwords.
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