API security is the process of protecting APIs from attacks. As APIs are very commonly used, so it is prone to attackers. API vulnerabilities are a common thing that can break down your whole system if not treated. APIs may have vulnerabilities like broken authentication and authorization, insufficient logging and monitoring, lack of rate limiting, etc. Regularly testing APIs will help you to identify vulnerabilities, and address them.
According to the Open Web Application Security Project (OWASP), there are ten API vulnerabilities that should be taken care of when you build an API. In this guide, let’s look at the Injection vulnerability.
Injection is a type of vulnerability that affects most applications and API systems. It is the underlying issue for a large number of vulnerabilities e.g. SQL injection, OS command injection, and XML injection.
It occurs when an application cannot properly distinguish between untrusted user data and code that can be HTTP request parameters, HTTP headers, and cookies. These vulnerabilities can affect API systems as well because an API is another way through which an untrusted user input can enter an application.
Injection can cause serious issues. A few of them are as under:
Injections are difficult to prevent as even if the malicious user data is not used by the application right away, the untrusted data can eventually travel somewhere in the program. This untrusted data can do something bad, such as a dangerous function or an unprotected query. And this is where they cause damage to the application, its data, or its users.
Still there are certain practices that you can adopt that can aid in preventing injection vulnerability in multiple ways.