OWASP Top 10 Explained: A Practical Guide to AppSec (Cursus)

In this wrap-up video, we summarize the key takeaways from the course on cybersecurity principles. We revisit the pillars of cybersecurity: Confidentiality, Integrity, Availability, Authentication, and Authorization (CIAAA), and their role in safeguarding systems and data. Highlights include defense-in-depth strategies, least privilege access, secure input sanitization, effective patch management, and robust logging practices. Learn the importance of secure third-party components, distinguishing between authentication and authorization, using secure defaults to prevent misconfigurations, and designing systems resilient to failure. Thank you for joining us!

In this video, we dive into the concept of broken access control, what it is, how it occurs, and why it matters for application security. Starting with the basics of authentication (validating identity) and authorization (granting access), we clarify the differences between these terms and illustrate what happens when authorization controls fail. Learn about common vulnerabilities, such as SQL injection and forced browsing, that attackers use to bypass access restrictions and gain unauthorized access to data and admin functions. Discover preventive measures like default-deny access, centralized control mechanisms, session management, and logging practices to protect sensitive areas and ensure users only access what they need.

In this video, we explore session hijacking, a critical vulnerability under the umbrella of broken access control. Using a hands-on example, we demonstrate how weak session ID generation—lacking complexity and randomness—can be exploited to predict and hijack session cookies. Follow along as we use developer tools and PowerShell scripting to identify patterns in session IDs and iterate through possible values to gain unauthorized access. Learn how attackers exploit predictable session IDs and the importance of implementing robust session management practices to protect your applications. This practical exercise underscores the risks of insecure session handling and how to mitigate them.

In this video, we tackle cryptographic failures and explore how to protect data in its three primary states: in motion, at rest, and in use. Learn how data in motion is safeguarded through protocols like HTTPS and TLS, ensuring secure transfers between devices. For data at rest (stored in databases or file system) encryption is typically managed with symmetric keys, supported by secure key management tools like Hardware Security Modules (HSMs) and Key Management Services (KMS). Lastly, we cover data in use, which involves protecting data actively processed in memory using techniques such as memory segmentation and encryption. Dive in to understand how these layers of protection maintain data confidentiality and prevent cryptographic failures in your applications.

In this video, we dive into injection attacks, a critical security vulnerability that occurs when untrusted input changes the behavior of an application. From SQL injection, where malicious SQL commands exploit unfiltered inputs, to script injection like cross-site scripting (XSS) that embeds harmful code into web pages, we cover it all. Learn about OS injection, which can execute system commands, and XML injection, such as XML External Entity (XXE) attacks, that target XML processors. Discover best practices to prevent these vulnerabilities, including input validation, output encoding, and security mechanisms like Content Security Policy. This is your guide to understanding and mitigating injection vulnerabilities in application security.

Here we will show a brief demo of a SQL injection attack utilizing OWASP WebGoat.

This video explores the concept of insecure design, introduced in 2021 to highlight the risks of architectural and design flaws in applications. Learn why security must be integrated into the early stages of development through threat modeling, secure design patterns, and pre-code actions that align with secure-by-design principles. Discover how to create functional and security requirements informed by regulations, frameworks, and threat intelligence. We cover key elements like building a secure architecture, leveraging the Secure Software Development Lifecycle (SDLC), and using tools like SAST, DAST, and SCA for validation. Finally, understand how to mitigate common design vulnerabilities such as insecure password recovery, improper file uploads, and lack of bot protections. This video is your guide to embedding security from the start and ensuring resilient, robust application designs.

In this video, we unpack security misconfiguration, a common vulnerability resulting from improper or default configurations across systems and applications. From operating systems and web servers to databases and application code, misconfigurations leave critical systems open to attack. Examples include leaving default settings on production environments, exposing debug code or unused third-party libraries, enabling directory listing for attackers to reverse-engineer code, and providing overly permissive cloud configurations, such as public S3 buckets. Learn the risks these missteps pose and discover how following security best practices and proactive configuration management can prevent data breaches and safeguard your applications.

This video dives into the risks posed by vulnerable and outdated components in application development. Modern applications rely heavily on dependencies—both direct and indirect—which form the building blocks of your software. While these libraries and frameworks speed up development, they can introduce significant security risks if not properly managed. Learn how vulnerabilities in direct and nested dependencies can expose your application to attacks, and discover how attackers leverage automated tools to identify misconfigured and outdated components. Explore best practices for mitigating these risks, including maintaining an up-to-date inventory of components, removing unnecessary libraries, and using internal or managed repositories for secure package management. Build safer applications by staying ahead of dependency-related vulnerabilities!

This video explores identification and authentication failures, highlighting common weaknesses in authentication processes and how they can be exploited. Learn about attacks such as weak passwords, credential stuffing, brute-force attacks, and improper password storage practices. We explain the importance of robust password policies, multi-factor authentication (MFA), and secure password storage techniques like hashing with salt and pepper. Discover best practices aligned with NIST guidelines, including limiting failed login attempts, avoiding default passwords, and using advanced authentication methods like biometrics or PKI. Strengthen your application's defenses against authentication vulnerabilities and protect user identities with these actionable insights.

This video demonstrates how authentication bypasses occur and how attackers exploit flaws in configuration or logic to bypass security measures. Using a lab example, we explore bypassing a two-factor password reset mechanism by tampering with HTTP request parameters. Follow along as we use developer tools and PowerShell to manipulate hidden inputs and parameter counts to bypass verification and reset a password.

Key takeaways include:

Common techniques for bypassing authentication, such as removing or renaming parameters and forced browsing.

Understanding how insecure validation logic can allow bypasses by failing to properly verify input values.

The importance of validating all parameters and ensuring robust security for authentication mechanisms.

This practical walkthrough highlights the risks of poorly implemented authentication and emphasizes the need for secure design and rigorous testing.

This video explores software and data integrity failures, focusing on how vulnerabilities can occur throughout the software development lifecycle (SDLC). From coding and building to deployment and runtime, we discuss key risks like unsigned software, tampered packages, and unverified repositories. Learn why signed software and hosting internal repositories are essential for maintaining code integrity, and discover the importance of a robust patch management process to address vulnerabilities. Additionally, we highlight the need for secure data exchanges with third parties, including validation mechanisms like encryption and mutual authentication. Build confidence in your software’s integrity with these critical best practices!

This video explores security logging and monitoring failures, a critical issue that underpins many major security incidents. Attackers exploit insufficient logging and delayed responses to achieve their goals undetected, with vulnerability probing often preceding successful exploits. Learn about the importance of capturing detailed, actionable logs for high-value transactions and the risks of logging sensitive information, which can lead to data breaches if exposed. We also discuss the role of Security Incident and Event Monitors (SIEMs) in aggregating and analyzing logs across systems to detect indicators of compromise and ongoing attacks. Enhance your security posture by implementing robust logging and monitoring practices to detect and respond to threats swiftly.

This video delves into Server-Side Request Forgery (SSRF), a vulnerability that allows attackers to manipulate web applications into making unauthorized requests to internal or external resources. Using examples, we demonstrate how malicious inputs can exploit file upload features or bypass input validation to access sensitive files or execute scripts. Learn prevention techniques, including network segmentation, deny-by-default firewall policies, input validation and sanitization, and using allow lists to restrict server requests to trusted domains. By implementing these measures, you can mitigate SSRF risks and protect your applications from unauthorized access and exploitation.