What is Security Testing in Software Testing with Example: Types, Tools, and How It Works

What is Security Testing in Software Testing

Security testing is a type of software testing and subset (part) of cybersecurity performed to identify vulnerabilities, preventing unauthorized access and potential attacks within a software application and to ensure that the application's data and resources remain protected. This applies to all types of systems like mobile apps, web applications, Databases and APIs.

Why Security Testing is Important

Security testing is important because it helps protect software applications from vulnerabilities and potential cyberattacks. By identifying and fixing security issues helps protect sensitive data, prevents financial and reputational damage and helps also organizations meet security and compliance requirements.

Who Performs Security Testing

Security testing is performed by Security Testers, Ethical Hackers, and Penetration Testers, who identify vulnerabilities within systems and applications. Additionally in some organizations, DevSecOps Engineers integrate security directly into the CI/CD pipeline.
Furthermore Bug Bounty Hunters also engage in discovering and reporting vulnerabilities receiving rewards in exchange for their efforts.

Security Testing Core Principles

Security testing verifies that key security attributes within a system are correctly implemented and maintained. These attributes assist in protecting data, managing access control and maintaining the reliability of the system. The attributes are listed below.

1. Confidentiality (Protecting data privacy) – Protecting sensitive data from unauthorized access or disclosure.
   Example: HTTPS encryption, end-to-end encrypted messaging
   WhatsApp chat only allows the intended user(s) to view messages.
   
   
2. Integrity (Data is not altered) – Ensuring that the data is accurate and has not been altered or tampered with.
   Example: Hashing files to detect changes, secure banking transactions
   The amount of online payment cannot be modified during transfer
   
   
3. Availability (System Uptime and Reliability) – Ensure that systems and services are always operational and accessible whenever needed.
   Example: Backup servers, load balancing, DDoS protection
   UPI payments working 24/7 even during peak hours or festivals
   
   
4. Authentication (Who are you) – Verifying the identity of a user or system using credentials.
   Example: Login with correct credentials or OTP or fingerprint
   Using fingerprint or Face ID to unlock your iPhone
   
   
5. Authorization (What you can do) – Ensure that the user or system can utilize only those resources for which access has been granted.
   Example: admin or regular user permissions, Admin can delete users, normal user can only view data
   Your Instagram posts can only be deleted by you
   
   
6. Accounting/Auditing (Track user) - Tracking user activity and maintaining records within the system.
   Example: Login logs, transaction history, file access logs
   Bank statements displaying the dates and locations where funds were utilized
   
   
7. Non-repudiation (Users cannot deny actions) – Prevent the user from denying the actions later they have performed.
   Example: Digital signatures, signed emails or transactions
   It is not possible to deny Google Pay or bank transactions later
   
   
8. Resilience (Recovery after attacks) – The system's ability to withstand an attack or failures and how quickly it recovers.
   Example: Disaster recovery systems, automatic failover after crash
   After a downtime, banking apps can quickly restore services

CIA Triad - Confidentiality, Integrity, Availability
AAA Security Controls - Authentication, Authorization, Accounting
Additional Security Properties - Non-repudiation, Resilience

Types of Security Testing

Security Testing ensures that the system remains protected against vulnerabilities, threats and unauthorized access. It is divided into high-level approaches and technical testing methods, which are listed below.

1. Vulnerability Scanning

   Through automated scanning of systems and applications, vulnerability scanning identifies major security weaknesses like outdated software, missing patches, and misconfigured applications.
   
   

2. Penetration Testing

   Ethical hackers conduct simulated cyberattacks to identify exploitable vulnerabilities.
   
   

3. Security Auditing (Security Posture Assessment)

   A structured review of code, systems and processes to ensure compliance with security standards and policies.
   
   

4. Risk Assessment

   Potential threats are identified, their impacts are analyzed and they are prioritized based on severity thereby reducing overall risk.
   
   

5. Ethical Hacking

   Authorized experts legally hack the system to discover security flaws before any malicious attackers do.
   
   

6. Static Application Security Testing (SAST)

   Source code is analyzed without executing the program to detect vulnerabilities during the early stages of development.
   
   

7. Dynamic Application Security Testing (DAST)

   The application is executed from outside (only inputs and outputs are tested) to identify real time vulnerabilities.
   
   

8. Interactive Application Security Testing (IAST)

   The application is executed from inside (Internal behavior and runtime flow) to identify real-time vulnerabilities.
   
   

9. Configuration Testing

   This ensures that system configurations such as servers, databases and networks are securely set up.
   
   

10. Security Regression Testing

    It ensures that new updates and changes do not introduce new vulnerabilities.

Security testing can be broadly categorized

Core Techniques: Vulnerability Scanning, Penetration Testing, Ethical Hacking

Application Security Testing: SAST, DAST, IAST

Assessment & Governance: Risk Assessment, Security Auditing

Validation & Maintenance: Configuration Testing, Security Regression Testing

Cybersecurity Threats and Attack Categories

Common Application Security Vulnerabilities and Attack Techniques

Applications often contain vulnerabilities that attackers exploit to gain unauthorized access, steal data or disrupt normal functionality. These issues are commonly found in mobile apps, web applications and API-based systems. The list is given below:

1. SQL Injection

   An attacker manipulates database queries to gain access or alter data.
   
   

2. Cross-Site Scripting (XSS)

   Malicious scripts are injected into a web page and then executed on the user's browser.
   
   

3. CSRF Testing (Cross-Site Request Forgery)

   Tricking a logged-in user into performing unwanted actions on a trusted site.
   
   

4. Session Hijacking

   Attackers take over or hijack a user's active session to gain unauthorized access.
   
   

5. Broken Authentication

   Weak authentication easily allows attackers to bypass login systems or steal credentials.

Social Engineering Attack Techniques

Social engineering attack techniques are methods employed by attackers to manipulate individuals into revealing their confidential information. These attacks target human psychology rather than technical system vulnerabilities. The list is given below:

1. Phishing

   Fake emails or websites used to steal sensitive information.
   
   

2. Spear Phishing

   Targeted phishing attacks against a specific person or group or organization.
   
   

3. Whaling

   A targeted phishing attack uses personalized information about the target - it will be high-level executives or important individuals.
   
   

4. Smishing (SMS Phishing)

   Attempting a phishing attack via SMS.
   
   

5. Vishing (Voice Phishing)

   Tricking a user through phone calls to reveal confidential data.

Network and Infrastructure Attack Techniques

Network and Infrastructure Attack Techniques include ways in which attackers attack computer networks, servers and other systems to steal data, interrupt services or gain unauthorized access. The focus of the attack is breaking or misusing the communication and hardware layers of systems. The list is given below:

1. DDoS (Distributed Denial of Service) Attack

   Overload the system with traffic so that it becomes unavailable.
   
   

2. MITM (Man-in-the-Middle) Attack

   An attacker secretly intercepts communication between two parties.
   
   

3. DNS Spoofing

   Redirecting a user to a fake website by corrupting their DNS records.
   
   

4. Port Scanning

   Scanning the system to identify open ports and potential vulnerabilities.
   
   

5. Packet Sniffing

   Capturing and analyzing network traffic to steal sensitive information.

Security Testing Tools

These tools (including best web vulnerability scanner tools) are utilized by testers and security professionals to ensure that the software remains protected against common attacks and meets established security standards. Here are some popular tools used in the industry.

Web Application Security Testing Tools

1. Burp Suite

   A proxy-based tool used for manual and automated web vulnerability testing.
   
   

2. OWASP ZAP

   An open-source alternative to Burp Suite that can be used by beginners.
   
   

3. Acunetix

   An automated system that detects common web vulnerabilities.
   
   

4. Nikto

   Detects servers that are out of date, misconfigurations, and known issues.
   
   

5. SQLmap

   Specifically designed to detect and exploit SQL injection flaws.

Network Security & Vulnerability Scanning Tools

1. Nmap

   Used for network discovery and port scanning to identify active hosts and services.
   
   

2. Nessus

   A commercial tool that is commonly used to assess vulnerabilities.
   
   

3. OpenVAS

   An open-source vulnerability scanning solution.

Penetration Testing Frameworks Tools

1. Metasploit Framework

   A framework that encompasses the development and execution of exploits.

Network Analysis & Monitoring Tools

1. Wireshark

   Captures and analyzes network packets in real time for deep inspection.

Enterprise Security Testing Tools

1. IBM Security AppScan

   It offers security testing for both static and dynamic applications.
   
   

2. Micro Focus Fortify

   Focuses on the security of coding and static analysis.

SSL/TLS & Certificate Testing Tools

1. Qualys SSL Server Test

   Assesses the SSL/TLS configuration of web servers.
   
   

2. DigiCert SSL Certificate Checker

   Verifies the validity of certificates and addresses any chain-related issues.
   
   

3. SSL Shopper Certificate Checker

   Offers comprehensive information about SSL certificates.
   
   

4. ImmuniWeb SSL Security Test

   Carries out advanced SSL security evaluations.
   
   

5. OpenSSL

   A command-line application designed for SSL/TLS and encryption operations.

How to do Security Testing (Step-by-Step)

It is also referred to as the Security Testing Life Cycle and constitutes a part of the Secure Software Development Lifecycle (SSDLC), where security is integrated throughout software development.

1. Requirement Analysis - First, understand the system requirements and identify the specific types of protection needed such as for data, system functions etc.
   
   
2. Threat Identification - Identify possible security threats such as data breaches, injection attacks, unauthorized access etc.
   
   
3. Test Planning - Define Scope, Entry/Exit Criteria, Testing Approach, and Boundaries of Security Testing.
   
   
4. Tool Selection - Selecting the appropriate tool for manual and automation purposes based on system requirements.
   
   
5. Test Execution - Performing security testing involves simulating attacks and examining how the system behaves under different security conditions.
   
   
6. Vulnerability Analysis & Reporting - Following the execution phase, various types of vulnerabilities are discovered and analyzed  concurrently, their severity is also assessed, and a document is subsequently prepared containing clear explanations and recommendations.
   
   
7. Fixing & Retesting - Developers fix the identified issues and subsequently, testers perform re-testing to ensure whether or not the vulnerabilities have been resolved.
   
   
   

Benefits of Security Testing

Security testing has numerous benefits and plays a crucial role in making secure and reliable applications. These are illustrated below.

1. Identifying Vulnerabilities Early – By identifying and addressing security flaws/weaknesses, design flaws and coding errors in development, you will significantly reduce risks before they are introduced into production and will minimize the cost and effort to correct those in a future release.
   
   
2. Protecting Sensitive Information - This prevents unauthorized access to your private data like personal and financial information, login credentials etc.
   
   
3. Prevention of Cyber Attacks - This will reduce the likelihood of real-life cyber attacks on the system. For instance, the techniques used in many cyberattacks include SQL injection, cross-site scripting XSS and hacking to gain access.
   
   
4. Enhancing User Trust - When the system ensures that system is secure, it enhances user trust, confidence, satisfaction and long-term usage.
   
   
5. Compliance to Regulations - This ensures that the system follows legal, regulatory and industry security standards related to data protection and privacy. This allows organization to meet compliance requirements such as safeguarding user data, avoiding legal penalties and maintaining proper security practices defined by governing bodies or industry.

Challenges in Security Testing

Although security testing is important, it is also associated with a variety of Technical and Practical challenges which make the entire process very complex.

1. Expensive Cost of Security Testing - Security testing requires well developed and highly experienced professionals as well as the use of the latest and most advanced testing tools resulting in an expensive project overall.
   
   
2. Access Restrictions And Time Restrictions - Testers are occasionally unable to receive full access to systems e.g., source code, server and database config etc, while also working under very tight deadlines and limited resources which reduces the depth and effectiveness of the security testing performed.
   
   
3. Generate False Results - Test tools often return false positives and do not catch actual security vulnerabilities therefore leaving the system with known vulnerabilities.
   
   
4. Rapidly Changing Threats - Cyber threats are evolving rapidly and therefore testers need to continually improve their knowledge and skills to identify new or different types of attacks and security vulnerabilities.
   
   
5. Complex System Architecture - Modern applications typically employ micro services architecture, cloud architecture, API's as well as 3rd party integration which makes it very complex and therefore very difficult to locate and identify security threat and vulnerabilities.

Real-Life Examples of Security Testing

1. Banking Application (Protecting Transactions) - As an example of security testing in the real world, banking applications like HSBC perform extensive amount of security tests prior to launching their app to ensure the bank has tested all parts of the application and is secured against hackers.
   The bank will test for encryption, authentication, and penetration testing to ensure their application is secure so they cannot hack into the applications and steal customer data or steal money by intercepting a customers transactions.
   
   
2. E-Commerce Websites (Preventing Data Theft) - As another example of real-world security testing, e-commerce companies continuously perform multiple types of security testing against their applications.
   All e-commerce companies conduct SQL injections testing against their login page and payment pages.
   Additionally, companies like Amazon will also conduct security testing to prevent session hijacking from happening while customers are logging into their websites and while they are processing their orders. Knowing all of the security tests have been performed, gives the customer confidence that their credit card information and order information is secure.
   
   
3. Social Media Sites (Protecting Accounts) - Millions of users use mobile applications like WhatsApp and Instagram every day to log in and send messages. Security testing, including End-to-End Encryption Validation, Authentication & Authorization and API Security Testing is extremely important to ensuring social media applications are safe and secure.

There are also many other examples in the real-world like Government Portals attacks (DDoS attacks on government sites) and securing data in Cloud platforms like Amazon Web Services use security testing to have the assurance that their data is secure.