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Thick Client
Security
Protecting Desktop Applications at Their Core.
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Thick Client Security
A thick client, also known as a fat client or rich client, is a type of software application that is designed to run on a client's computer, rather than on a remote server. Thick clients are typically large, complex programs that perform many functions locally, and require significant resources and processing power on the client side.
Thick client pentesting involves both local and server-side processing and often uses proprietary protocols for communication.
ARCHITECTURE OF THICK CLIENT
Two-Tier Architecture
In two-tier architecture, the thick client application implements client-to-server communication. The application is installed on the client computer and, in order to work, will need to communicate with a database server.
Three-Tier Architecture
In three-tier architecture, the client communicates with an application server, which in turn talks to the database in a manner similar to a regular web application. The most common communication method in these applications may be carried out using HTTP/HTTPS. Three-tier architecture has a security advantage over two-tier architecture because it prevents the end-user from communicating directly with the database server.
Key Benefits
Protects sensitive data from breaches.
Reduces risk from both internal and third-party sources.
Avoid costly service interruptions by preventing infections and exploits
No Business Disruptions
Keeps customer data secure and builds customer confidence.
Approach & Methodology
- Gather information about the application (Thick Client) such as executable files (.exe), number of login panels, source code, lines of code, etc.
- Kickoff meeting, SPOC nomination, and walkthrough of the application.
- Determine the type of testing: Black Box Testing, White Box Testing, or Gray Box Testing.
- Use of commercial tools like Burp Suite Professional and open-source tools such as SQLmap, DirBuster, EchoMirage, Luxsafe, IDA etc.
- Use of proprietary checklist.
- Develop a testing strategy and prioritize test cases to address high-risk issues first.
- Search and gather known exploits from various sources.
- Identify potential threats to application resources.
- Use automated scanners to detect signature-based vulnerabilities such as XSS, SQL Injection, LFI, etc.
- Perform manual testing to identify business logic flaws.
- Use automated testing to identify areas of interest for deeper manual testing.
- Follow standards such as OWASP Top 10 (Web/Mobile/API) and SANS Top 25.
- Manually exploit identified vulnerabilities to assess impact.
- Chain vulnerabilities to increase the overall impact.
- Collect and log evidence (screenshots, logs) to demonstrate exploitation.
- Prepare initial report including severity, impact, affected endpoints, evidence, and remediation recommendations.
- Perform risk evaluation.
- Client development team addresses the identified vulnerabilities.
- Perform confirmatory testing (VA-PT) for revalidation.
- Attempt bypass of vulnerabilities to verify robustness of fixes.
- Provide report with Open/Closed status of vulnerabilities.
- Conduct closing meeting.
- Submit final report and regulator certificates (e.g., CERT-In), as per client requirement.
Deliverables
As a leading cyber security firm, Secure n Comply emphasizes fully communicating the value of its service and findings.
Executive New Report- Remediation
- Compliance Certificate
- Support by Technical Experts
- Suggestions as per Industry Best Practices
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Why Organisations Choose Us
Every organisation deserves a cybersecurity partner that delivers clarity, confidence, and technical excellence. At Secure n Comply, we combine deep domain expertise, industry-leading certifications, and modern security frameworks to address today’s complex cyber and compliance challenges effectively. Our customer-first mindset ensures solutions are practical, scalable, and aligned with your business goals. By leveraging advanced technologies and a proactive approach, we help organisations strengthen resilience, maintain compliance, and stay secure from day one and beyond.
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January 30 , 2026
