25 Jun 2023

Python Security best Practices - Python Security Common Issues and Prevention

Python is a popular programming language that is widely used for web development, scientific computing, data analysis, artificial intelligence, and many other applications. However, like any other programming language, Python is not immune to security vulnerabilities and attacks. In this blog, we will discuss some common security issues that affect Python applications and provide tips on how to prevent them.

Injection attacks

Injection attacks are a common type of attack that targets applications that use user input to construct queries or commands to a backend system. In Python, injection attacks can occur when user input is not properly sanitized before being used in SQL queries, OS commands, or other types of system calls.


To prevent injection attacks, you should always use parameterized queries or prepared statements to ensure that user input is properly sanitized before being used in queries. You can also use a library like the Python DB-API, which provides a standardized interface for database access and includes built-in support for parameterized queries.

Cross-site scripting (XSS)

Cross-site scripting (XSS) is a type of attack that occurs when an attacker injects malicious code into a web page that is then executed by a victim's browser. XSS attacks are often used to steal sensitive information such as login credentials, session tokens, and other user data.


To prevent XSS attacks, you should always validate and sanitize user input before displaying it on a web page. You can also use a web application firewall (WAF) to help detect and block malicious requests.

Cross-site request forgery (CSRF)

Cross-site request forgery (CSRF) is a type of attack that occurs when an attacker tricks a victim into performing an action on a website without their consent. CSRF attacks often target websites that use cookies or other types of session tokens to authenticate users.


To prevent CSRF attacks, you should always use anti-CSRF tokens, which are unique tokens that are generated for each user session and used to validate requests. You can also use the SameSite attribute in cookies to prevent cookies from being sent in cross-site requests.

Insecure password storage

Insecure password storage is a common security issue that affects many Python applications. If passwords are stored in plaintext or using weak encryption, they can be easily stolen by attackers.


To prevent insecure password storage, you should always use a strong encryption algorithm, such as bcrypt or scrypt, to hash passwords before storing them in a database. You should also use a salt, which is a random string of characters that is added to the password before hashing to prevent attacks like rainbow table attacks.

Denial of Service (DoS) attacks

Denial of Service (DoS) attacks are a type of attack that aims to disrupt the normal functioning of a website or application by overwhelming it with traffic or requests. DoS attacks can be carried out using a variety of techniques, including flooding the server with traffic, exploiting vulnerabilities in the application or operating system, or using botnets.


To prevent DoS attacks, you should always use a web application firewall (WAF) to detect and block malicious traffic. You should also monitor your system for unusual activity and have a plan in place to mitigate attacks.

In conclusion, Python applications are vulnerable to a range of security issues, including injection attacks, XSS, CSRF, insecure password storage, and DoS attacks. To prevent these issues, it is important to validate and sanitize user input, use parameterized queries, anti-CSRF tokens, and strong encryption for password storage, and use a web application firewall to detect and block malicious traffic. By following these best practices, you can help keep your Python applications secure and protect your users' data from malicious attacks.