Secure Coding Practices

5 minutes 5 Questions

Secure Coding Practices are guidelines and principles followed by developers during the implementation stage of the Secure SDLC to minimize the introduction of vulnerabilities in software systems. These practices include input validation, output encoding, proper error handling, and least privilege …

Guide to Secure Coding Practices - CISSP Software Development Security

Secure Coding Practices is an important concept in the area of software development security which focuses on writing code in a way that prevents unauthorized access and insecure data practices. This practice aims at reducing vulnerabilities, managing insecure data, and making sure that the software continues to function correctly under malicious attacks.

Why is it important?
It is important because it helps to prevent security vulnerabilities that can lead to unauthorized access or data leaks, which can have severe consequences such as financial loss, reputational damage, and even legal implications.

What is it?
Secure Coding Practices refers to techniques and procedures that developers use to code in a secure way to prevent security vulnerabilities. This includes practices like input validation, output encoding, and the use of secure methods and libraries amongst others.

How does it work?
Secure coding works by implementing security checkpoints, adopting proven methodologies, and using secure libraries to prevent bugs from being created during coding. It also includes testing the code for security vulnerabilities and fixing them before the software is released.

Exam Tips: Answering Questions on Secure Coding Practices
1. Understand the basics: Make sure you have a solid understanding of what secure coding practices are and why they are important.
2. Think practically: When answering questions, think about how secure coding practices would be implemented in a real-world scenario.
3. Specific practices: Be prepared to explain specific secure coding techniques like input validation and output encoding.
4. Relate to security models: Understand how secure coding relates to other security models and protocols.
5. Scenario-based questions: Be prepared to answer scenario-based questions by applying your knowledge of secure coding practices.

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Question 1

A developer needs to fix an SQL injection vulnerability in a web application. What solution should be implemented to mitigate this vulnerability?

Least privilege principle Secure password storage Parameterized queries Sanitizing user input

Correct Answer: Parameterized queries

Parameterized queries separate the SQL query from user-provided input to prevent SQL injection. Sanitizing user input does not directly address SQL injection, as it may still allow malicious input through. Secure password storage and the least privilege principle are secure coding practices, but they do not resolve SQL injection issues. Regular expressions validate input but are not sufficient for preventing SQL injection, and output encoding is more relevant to preventing XSS attacks.

Question 2

An application accesses various resources and performs multiple actions on a system. To reduce the security risk, which secure coding principle should be applied?

Data encryption in transit Input validation Data encryption at rest Least privilege principle

Correct Answer: Least privilege principle

The least privilege principle ensures that applications have only the necessary access to perform specific tasks, limiting the attack surface in case of a breach. Input validation prevents invalid or malicious input from entering the system but does not ensure limited access to resources. Encrypting data at rest or in transit primarily addresses data confidentiality, while secure password storage and output encoding address specific vulnerabilities rather than general application access.

Question 3

A developer is working on a web application that requires users to authenticate using a password. What secure coding technique should the developer implement to protect user passwords from attackers?

Encrypting passwords with reversible encryption Secure password storage using hashing and salting Storing passwords in plaintext Hiding passwords with base64 encoding

Correct Answer: Secure password storage using hashing and salting

Hashing and salting are the recommended practices for secure password storage since hashing is a one-way function that hides the original plaintext password, while salting adds a random value to prevent precomputed attacks. Storing passwords in plaintext and using reversible encryption methods are insecure. Hiding passwords with base64 encoding is obfuscation, not encryption. SSL/TLS encryption is used for data in transit but does not ensure secure password storage.

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