Penetration tests help identify weak points in IT systems before they are exploited by cybercriminals. Thanks to them, organizations can proactively strengthen their security, minimizing the risk of data leaks, reputation loss, and costly downtime.

The purpose of this article is to present the most common security vulnerabilities detected during penetration tests. We will focus on describing typical vulnerabilities that pentesters encounter and discussing best practices for their elimination. The article is intended for security specialists, IT managers, and anyone interested in cybersecurity topics.

Introduction to Penetration Testing

Definition of Penetration Testing

Penetration tests are controlled and authorized attempts to break into IT systems to identify and address weaknesses before they are exploited by unauthorized persons. They are conducted by specialized experts called pentesters, who use the same tools and techniques as cybercriminals, but in a legal and ethical manner.

Goals of Penetration Testing

The main goal of penetration testing is to identify weak points in system security. Pentests help with:

Evaluating the effectiveness of current protection measures.
Testing new applications and systems before their deployment.
Training IT teams through realistic attack scenarios.
Meeting regulatory requirements and compliance with security standards.

Types of Penetration Tests

There are several types of penetration tests that differ in scope and approach:

Black-box: Testers have no information about the system, which simulates an attack from outside by an unknown attacker.
White-box: Testers have full knowledge of the system, including access to source code and documentation, allowing for thorough security examination.
Grey-box: Testers have limited information about the system, allowing for simulation of an internal attack by an employee or person with limited permissions.

📚 Read the complete guide: IAM / Zero Trust: Zarządzanie tożsamością i dostępem - od podstaw do Zero Trust

General Security Vulnerabilities

Outdated Software

One of the most common and critical security vulnerabilities is the lack of regular software updates. Outdated systems and applications are exposed to known vulnerabilities that can be easily exploited by attackers. Regular updates and patches are crucial for protecting systems against new threats.

Lack of Strong Passwords

Weak passwords are still one of the biggest security problems. Passwords such as “123456” or “password” can be easily guessed or cracked using dictionary attacks and brute-force. It is recommended to use strong, unique passwords and implement policies for their regular changes.

Neglecting Security Policies

Security policies are the foundation of effective information protection. The lack of clearly defined and enforced policies can lead to employees unknowingly creating security gaps. Organizations should have clearly defined rules regarding data access, password management, use of portable devices, and other security-related aspects.

System Configuration Errors

Incorrect Server Configuration

Servers are often misconfigured, which can lead to serious security vulnerabilities. Typical problems include: leaving default passwords, lack of updates, incorrect permission settings, and open ports. These errors can be easily detected and exploited by attackers.

Lack of Appropriate Network Protection

Improper configuration of network devices, such as routers and firewalls, can lead to easy access to the internal network by attackers. It is important to regularly check and update network configuration to ensure an appropriate level of protection.

Default Settings

Leaving default settings in systems and applications is a common error that can lead to serious threats. Attackers often know default settings and can use them to take control of the system. Every new deployment should be thoroughly checked for default settings and properly configured.

Web Application Security Vulnerabilities

Web applications are one of the most common targets of cyberattacks. Many security vulnerabilities result from code errors and improper application security.

SQL Injection

SQL Injection is one of the most dangerous vulnerabilities in web applications. It involves injecting malicious SQL queries into the application, which can allow the attacker to access the database, modify its contents, or delete data. To prevent such attacks, appropriate data validation techniques should be used, and query parameters should be used instead of dynamic SQL queries.

Cross-Site Scripting (XSS)

Cross-Site Scripting (XSS) is a vulnerability that allows an attacker to inject malicious JavaScript code into a website. This can lead to user data theft, session hijacking, or displaying malicious content. To protect the application from XSS, appropriate input data validation and filtering techniques should be used.

Cross-Site Request Forgery (CSRF)

Cross-Site Request Forgery (CSRF) is an attack that involves forcing a logged-in user to perform unintended actions on a website where they are logged in. The attacker can exploit the user’s trust in the site to perform unauthorized operations. To protect the application from CSRF, CSRF tokens should be used, which are verified with each user request.

Authentication and Authorization Problems

Lack of Multi-Factor Authentication

Multi-factor authentication (MFA) significantly increases security level by requiring more than one method of user authentication. Lack of MFA can lead to easy account takeover by attackers, especially if passwords are weak. Implementing MFA, such as two-factor authentication (2FA), is one of the most effective methods of protecting user accounts.

Improper Session Management

Session management is crucial for ensuring security of users logged into the system. Errors in this area, such as lack of appropriate session expiration mechanisms, can lead to session hijacking by attackers. Regular session expiration and use of unique session identifiers are essential for system security.

Incorrect User Permissions

Assigning permissions to users is a process that must be carried out with great care. Incorrect permission assignment can lead to unauthorized access to sensitive data. It is important to apply the least privilege principle, meaning assigning users only those permissions that are necessary to perform their tasks.

Data Storage Errors

Lack of Data Encryption

Data encryption is a basic method of protecting information from unauthorized access. Lack of data encryption, both in transit and at rest, exposes them to interception and theft. Organizations should use strong encryption algorithms and regularly update their encryption methods to ensure an appropriate level of protection.

Improper Backup Management

Backups are essential for ensuring business continuity in case of failure or attack. However, improper backup management, such as storing them in unsafe locations or lack of regular updates, can lead to data loss. Backups should be regularly created, encrypted, and stored in secure locations.

Data Leaks

Data leaks are one of the most serious security incidents that can have far-reaching consequences for an organization and its customers. Analysis of data leak cases shows that they most often result from negligence in information protection, such as lack of appropriate security, improper data management, and insufficient employee training.

Lack of Awareness and Training Among Employees

Importance of Cybersecurity Education

Education and training are crucial for raising employee awareness about cyber threats. Regular training on security best practices, recognizing phishing and other social engineering attacks can significantly reduce the risk of a successful attack.

Most Common Employee Errors

Employees often make mistakes that can lead to security breaches. The most common errors include: clicking on suspicious links, sharing passwords, lack of security on portable devices, and unknowingly installing malicious software. Making employees aware of these threats and teaching them how to avoid them is crucial for organizational protection.

Training Programs

Effective training programs should be regular, up-to-date, and tailored to the specific needs of the organization. They may include online training, workshops, attack simulations, and knowledge tests. It is important for employees to stay up-to-date with the latest threats and know how to defend against them.

Best Practices and Recommendations

Basic System Security Principles

Presentation of key principles and practices in system security, such as regular updates, strong passwords, multi-factor authentication, and encryption. Organizations should also regularly conduct security audits and penetration tests to ensure their systems are properly secured.

Security Policy Implementation

Recommendations for creating and implementing effective security policies that cover all aspects of information protection, from password management to physical security. These policies should be regularly reviewed and updated to respond to changing threats.

Regular Penetration Testing

Discussion of the importance of regular penetration testing and security monitoring. These tests should be part of a cyclical process of evaluating and improving security to ensure the organization is prepared for new threats. Organizations should also use different types of penetration tests to get a complete picture of their security status.

Summary

Summary of the most important conclusions discussed in the article. Encouragement for organizations to take active steps to improve security and forecasts regarding future trends and development of penetration testing in the context of growing cyber threats.

Conclusion

Understanding threats and implementing appropriate countermeasures is crucial for every organization that wants to effectively protect its data and systems from cyberattacks. Regular penetration testing, appropriate training, and implementing security best practices are the basic steps every organization should take to protect itself against growing threats in the cyber world.

Learn key terms related to this article in our cybersecurity glossary:

IT Infrastructure Penetration Testing — IT infrastructure penetration testing is a controlled and ethical process of…
Wi-Fi Network Penetration Testing — Wi-Fi network penetration testing is the process of assessing the security of…
Penetration Testing — Penetration testing, also known as pentesting, is a controlled process of…
Ransomware — Ransomware is a type of malicious software (malware) that blocks access to a…
Cybersecurity — Cybersecurity is a collection of techniques, processes, and practices used to…

Learn More

Explore related articles in our knowledge base:

Explore Our Services

Need cybersecurity support? Check out:

Security Audits - comprehensive security assessment
Penetration Testing - identify vulnerabilities in your infrastructure
SOC as a Service - 24/7 security monitoring