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.

Thick client are also known as fat client. For this reason, it is important to understand which files are being accessed by the application.

It protects multiple Fortune 500 companies and governments around the world. It is commonly seen enterprises using thick client applications for their internal operations. Static Analysis - Thick Client Application Pentesting says: March 10, 2020 at 4:30 pm […] are various tools that are used to reverse engineer a thick client application. Whenever the tool is opened, a function in the tool validates against this registry value and provides access to the GUI of the tool. 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.

These applications are completely independent of the user’s machine and do not require installation. As the thick client applications have two attack surfaces like static and dynamic so a vulnerability assessment need to be done on it in order to ensure that thick client applications are ready to fight against the cybercriminal.

Many organizations do not have enough internal security staff with the correct tools and experience to perform thick client assessments, which is a tough job.

Examples of connection drivers are ODBC (Open Database Connection) and JDBC (Java Database Connection).Thick Clients developed on a two-tier architecture send database queries directly to the database and business logic is executed on the basis of the records/response from the server.These types of thick clients have the following three components:In this architecture, the client application communicates with an application server over an HTTP protocol. The application server, in turn, queries a database to fetch/store data.Web applications, also known as Thin Clients, are browser-based applications that run on a web server. In the next article, we will discuss traffic interception techniques for thick client applications.At Infosec, we believe knowledge is the most powerful tool in the fight against cybercrime. Download Wireshark using the following link:Run Wireshark and capture the packets on Host Only Adapter’s interface while the application is running.The preceding window shows that the local machine is making communication with the remote host 192.168.56.110.Applications might access files on the filesystem to read/write sensitive data from/to those files while the application is running. In this first part of this series, we will start with discussing the According to Wikipedia, a fat client/heavy client/rich client/thick client is a computer (client) in client–server architecture or networks that typically provides rich functionality independent of the central server”.Though, web applications are ruling the world we still see thick client applications being used by a lot of computer users.

Decrypting the encrypted password using AES key and IV found in the config mentioned above file is one way to do it.


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