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API SECURITY

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What is an API

An Application Programming Interface (API) is a software intermediary that allows your applications to communicate with one another. It provides routines, protocols, and tools for developers building software applications, while enabling the extraction and sharing of data in an accessible manner.

Web APIs connect between applications and other services or platforms, such as social networks, games, databases and devices.

Additionally, Internet of Things (IoT) applications and devices use APIs to gather data, or even control other devices. For example, a power company may use an API to adjust the temperature on a thermostat to save power.

 

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API security threats

APIs often self-document information, such as their implementation and internal structure, which can be used as intelligence for a cyber-attack. Additional vulnerabilities, such as weak authentication, lack of encryption, business logic flaws and insecure endpoints make APIs vulnerable to the attacks outlined below.

Man In The Middle (MITM)

man in the middle (MITM) attack involves an attacker secretly relaying, intercepting or altering communications, including API messages, between two parties to obtain sensitive information.

For example, a perpetrator can act as a man in the middle between an API issuing a session token in an HTTP header and a user’s browser. Intercepting that session token would grant access to the user’s account, which might include personal details, such as credit card information and login credentials.

 

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API injections (XSS and SQLi)

In a code injection attack, malicious code is inserted into a vulnerable software program to stage an attack, such as cross site scripting (XSS) and SQL injection (SQLi).

Any web API requiring parsers or processers is vulnerable to attack. For example, a code generator that includes parsing for JSON code, and doesn’t sanitize input properly, is susceptible to the injection of executable code that runs in the development environment.

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API security best practices

Securing your API against the attacks outlined above should be based on:

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