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Course 39 - NodeJS Security Pentesting and Exploitation | Episode 2: Mitigating RCE, OS Injection, and Path Traversal Vulnerabilities
In this lesson, you’ll learn about: critical Node.js vulnerabilities caused by unsafe user input handling, including RCE, command injection, XSS, and directory traversal1. Core Security Principle🔹 Key idea:
Never trust user input👉 Any data from users must be treated as hostile by default
Without validation, it can become a direct execution path into the system.2. Remote Code Execution (RCE) via eval()🔹 Dangerous functions:
If user input reaches an execution function → the server is effectively “remote-controlled”3. Remote OS Command Injection🔹 Vulnerable function:
They treat input as arguments, not executable shell strings4. Cross-Site Scripting (XSS)🔹 Cause:
Unsanitized user input reflected into browser output🔹 Impact:
Server-side mistake becomes client-side compromise5. Directory Traversal (Path Traversal)🔹 Technique:
Using patterns like:
If that chain is not broken at validation → full compromise becomes possible
You can listen and download our episodes for free on more than 10 different platforms:
https://linktr.ee/cybercode_academy
Never trust user input👉 Any data from users must be treated as hostile by default
Without validation, it can become a direct execution path into the system.2. Remote Code Execution (RCE) via eval()🔹 Dangerous functions:
- eval()
- setTimeout()
- setInterval()
- new Function()
- Infinite loops → server crash (DoS)
- Forced termination (process.exit())
- Full server takeover (reverse shell execution)
If user input reaches an execution function → the server is effectively “remote-controlled”3. Remote OS Command Injection🔹 Vulnerable function:
- child_process.exec
- Input is passed into shell commands
- Attacker injects separators like ;
- Extra commands execute on the OS
- Read sensitive files (e.g., system password data)
- Execute arbitrary system commands
- execFile
- spawn
They treat input as arguments, not executable shell strings4. Cross-Site Scripting (XSS)🔹 Cause:
Unsanitized user input reflected into browser output🔹 Impact:
- Script execution in victim’s browser
- Session hijacking potential
- UI manipulation
Server-side mistake becomes client-side compromise5. Directory Traversal (Path Traversal)🔹 Technique:
Using patterns like:
- ../
- repeated directory jumps
- Access files outside intended directory
- Read sensitive system files
- Break application file boundaries
- Input is executed instead of validated
- System commands are built from raw strings
- Output is rendered without escaping
- File paths are not restricted
If that chain is not broken at validation → full compromise becomes possible
You can listen and download our episodes for free on more than 10 different platforms:
https://linktr.ee/cybercode_academy
View all episodes
By CyberCode AcademyIn this lesson, you’ll learn about: critical Node.js vulnerabilities caused by unsafe user input handling, including RCE, command injection, XSS, and directory traversal1. Core Security Principle🔹 Key idea:
Never trust user input👉 Any data from users must be treated as hostile by default
Without validation, it can become a direct execution path into the system.2. Remote Code Execution (RCE) via eval()🔹 Dangerous functions:
If user input reaches an execution function → the server is effectively “remote-controlled”3. Remote OS Command Injection🔹 Vulnerable function:
They treat input as arguments, not executable shell strings4. Cross-Site Scripting (XSS)🔹 Cause:
Unsanitized user input reflected into browser output🔹 Impact:
Server-side mistake becomes client-side compromise5. Directory Traversal (Path Traversal)🔹 Technique:
Using patterns like:
If that chain is not broken at validation → full compromise becomes possible
You can listen and download our episodes for free on more than 10 different platforms:
https://linktr.ee/cybercode_academy
Never trust user input👉 Any data from users must be treated as hostile by default
Without validation, it can become a direct execution path into the system.2. Remote Code Execution (RCE) via eval()🔹 Dangerous functions:
- eval()
- setTimeout()
- setInterval()
- new Function()
- Infinite loops → server crash (DoS)
- Forced termination (process.exit())
- Full server takeover (reverse shell execution)
If user input reaches an execution function → the server is effectively “remote-controlled”3. Remote OS Command Injection🔹 Vulnerable function:
- child_process.exec
- Input is passed into shell commands
- Attacker injects separators like ;
- Extra commands execute on the OS
- Read sensitive files (e.g., system password data)
- Execute arbitrary system commands
- execFile
- spawn
They treat input as arguments, not executable shell strings4. Cross-Site Scripting (XSS)🔹 Cause:
Unsanitized user input reflected into browser output🔹 Impact:
- Script execution in victim’s browser
- Session hijacking potential
- UI manipulation
Server-side mistake becomes client-side compromise5. Directory Traversal (Path Traversal)🔹 Technique:
Using patterns like:
- ../
- repeated directory jumps
- Access files outside intended directory
- Read sensitive system files
- Break application file boundaries
- Input is executed instead of validated
- System commands are built from raw strings
- Output is rendered without escaping
- File paths are not restricted
If that chain is not broken at validation → full compromise becomes possible
You can listen and download our episodes for free on more than 10 different platforms:
https://linktr.ee/cybercode_academy