Command Injection

Question 1

What’s a command injection attack?

Answer 1

occurs when an attacker is able to execute arbitrary system commands on a target host by manipulating input that is passed to a command execution environment

Question 2

When do command injection vulnerabilities typically arise?

Answer 2

when user-supplied data is not properly validated or sanitized before being used to construct a command for execution

Question 3

What are the potential consequences of command injection?

Answer 3

unauthorized access, data theft, system compromise, or even remote code execution

Question 4

What is the prevention and mitigation of command injection attacks?

Answer 4

• Input Validation and Sanitization
  
  • ensure that all user-supplied input is properly validated and sanitized before being used in command execution
• Avoid Shell Interpolation
  
  • rather than directly interpolating user input into system commands, use parameterized or prepared statements to separate user input from command execution
• Whitelist Input
  
  • validate input against a whitelist of allowed characters or patterns, rejecting any input that deviates from the expected values
• Input Encoding
  
  • apply proper input encoding to mitigate the impact of special characters that may be interpreted by the command shell
• Principle of Least Privilege
• Regular Security Testing