7 Web Application Risks That Can Be Identified Through Penetration Testing

3 Main Penetration Testing Strategies 

• Black-box penetration testing. Testers approach the web application as external observers and attempt to exploit vulnerabilities without prior knowledge of the system. They use manual and automated testing methods, as well as social engineering, to simulate various attack scenarios, identify potential entry points, and assess the application's resilience to external attacks.
• White-box penetration testing. This is the opposite approach: testers are given full access to the application's source code, databases, and infrastructure. They examine the system from the inside to thoroughly test security controls, identify vulnerabilities, and assess potential risks. White-box pentesting is particularly effective for uncovering weaknesses related to code quality, logic errors, and configuration issues, but it takes more time due to the broader scope of work.
• Gray-box penetration testing combines elements of black-box and white-box testing. Testers have some knowledge of the application's internal structure. This allows them to focus on specific problem areas while still exploring real attack vectors. The combination of an external perspective and limited internal knowledge provides a balanced view of vulnerabilities and their potential impact from different angles.

Common Web Application Security Risks

SQL injection occurs when attackers insert code into your website's input fields (e.g., login forms) to execute malicious SQL queries. This can lead to leaking sensitive data, data manipulation, or even giving attackers full control over the application. SQL injection can be prevented through proper input validation and the use of parameterized queries.

Cross-site scripting (XSS) allows hackers to inject scripts into web pages viewed by other users, leading to theft of cookies, personal user information, or redirection to malicious sites. XSS attacks can be prevented through proper input validation and output encoding.

Cross-site request forgery (CSRF) occurs when attackers use cookies from another site stored in the user's browser to force the user to perform actions on that site without their knowledge. For example, a malicious site could change your password on a social network using the cookie as proof of your request. To prevent CSRF, anti-CSRF tokens are used, which ensure that only the real user can initiate actions on the web.

Broken access control allows unauthorized users to gain access to restricted resources or functionality. This vulnerability arises when proper access controls, such as user roles and multi-level privileges, are not effectively enforced.

Similarly, broken authentication allows attackers to bypass authentication mechanisms and gain unauthorized access to web application accounts. This can result from weak password policies, insecure session management, or predictable authentication tokens.

Security misconfiguration occurs when the application or its infrastructure is not inherently broken but is not configured securely. For example, failing to update an outdated protocol in time or not reviewing default access permissions, resulting in a sensitive directory being accessible to anyone. Regular security audits and proper configuration management are crucial to preventing this vulnerability.

Sensitive data exposure occurs when applications fail to properly protect confidential information, such as passwords or credit card data. Strong encryption of data in transit and at rest, as well as secure data storage, are critical to managing this risk. Ideally, you should ensure that even if hackers directly intercept your data, they cannot decrypt it.