Вивчайте Code Injection Risks | Understanding Python Vulnerabilities

Code injection is a critical security risk in Python applications, occurring when untrusted data is interpreted as code and executed by your program. This vulnerability can allow attackers to execute arbitrary commands, steal sensitive data, or compromise your system. Understanding how code injection happens and how to avoid it is essential for writing secure Python code.


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# Insecure code: using eval() with a predefined string

expression = "__import__('os').system('echo injected')"
result = eval(expression)
print("Result:", result)

The use of the eval() function in the previous code sample allows attackers to execute any Python code they provide as input. If a user enters something malicious like __import__('os').system('rm -rf /'), eval() will execute it, potentially causing severe harm to your system. This is dangerous because eval() does not distinguish between safe expressions and malicious code when given untrusted input.


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# Secure alternative: restrict operations to safe functions without using input()

def safe_calculate(operation, x, y):
    allowed_operations = {
        "add": lambda a, b: a + b,
        "subtract": lambda a, b: a - b,
        "multiply": lambda a, b: a * b,
        "divide": lambda a, b: a / b if b != 0 else "Division by zero"
    }
    if operation in allowed_operations:
        return allowed_operations[operation](x, y)
    else:
        return "Invalid operation."

# Example usage
operation = "add"
x = 2
y = 3
result = safe_calculate(operation, x, y)
print("Result:", result)

This secure alternative restricts user input to only the operations defined in the allowed_operations dictionary. Instead of evaluating arbitrary code, it matches the user's request to a specific, safe function. By not using eval() and only allowing predefined operations, you eliminate the risk of code injection and keep your application secure.

Definition

Definition: Code injection occurs when untrusted input is executed as code by your program. Real-world consequences include unauthorized access, data theft, system compromise, and significant financial or reputational damage for organizations.

1. What is the main risk associated with using eval() on untrusted data?

2. Which approach helps prevent code injection in Python?

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