CORShyökkäysten

CORShyökkäysten refers to Cross-Origin Resource Sharing (CORS) attacks. CORS is a security mechanism implemented by web browsers that controls how web pages from one origin (domain, protocol, or port) can request resources from another origin. When a browser makes a request to a different origin, it checks if the server has sent appropriate CORS headers. If the headers are absent or misconfigured, the browser blocks the request, preventing potential security vulnerabilities.

CORS attacks exploit misconfigurations or vulnerabilities in the CORS implementation of a web application. Attackers can leverage these weaknesses to bypass the same-origin policy, which is a fundamental security measure in web browsers. By tricking a user's browser into making requests to a vulnerable server with malicious intent, attackers can steal sensitive information, perform unauthorized actions on behalf of the user, or deface websites.

Common methods for exploiting CORS vulnerabilities include using overly permissive CORS configurations, such as allowing requests from any origin ('*') without proper authentication or validation. Attackers might also exploit flaws in how the server handles origin verification, leading to unauthorized access. The consequences of a successful CORS attack can range from data breaches to account takeovers, depending on the sensitive data and functionalities exposed by the vulnerable application. Mitigation strategies involve implementing strict and specific CORS policies, validating origin headers carefully, and employing modern security practices to protect against these types of attacks.