CyberShield

  Introduction While testing web applications, not every vulnerability immediately leads to exploitation. However, small leaks of information can be just as dangerous. This is where Information Disclosure comes into play. It is one of the most common issues in modern web applications and often serves as the starting point for more serious attacks. What is Information Disclosure? Information Disclosure occurs when a web application unintentionally exposes sensitive or internal data to users. Although this data may not directly compromise the system, it provides valuable insights that attackers can use to plan further attacks. Types of Sensitive Information Exposed Web applications may leak different kinds of useful data: Server and Software Details Version numbers of servers or frameworks (e.g., Apache, PHP) that may have known vulnerabilities. Sensitive Files Files such as: Configuration files (.env, web.config) Backup files (.bak, .old) Source control directories (.git) Detailed E...

🔐 Introduction After learning common web vulnerabilities like XSS and CSRF , it is important to understand more critical attacks such as Command Injection (OS Command Injection) . This vulnerability allows an attacker to execute operating system commands directly on the server , which can lead to full system compromise. 💡 What is Command Injection? Command Injection occurs when a web application takes unsafe user input and passes it directly to a system shell or OS command execution function. 👉 If input is not properly validated, attackers can inject malicious system commands. 🧠 How Command Injection Works Imagine a website has a “ping test” feature to check server connectivity. Backend logic example: system("ping -c 4 " + user_input); Normal Input: 8.8.8.8 Result: ping -c 4 8.8.8.8 Malicious Input: 8.8.8.8; whoami Result: ping -c 4 8.8.8.8; whoami 👉 The server executes both commands, exposing system-level information. ⚠️ Common Command Injection Operators Attackers use...