Cross-origin resource sharing (CORS) | portswigger | hacksudo

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Cross-origin resource sharing (CORS)

In this section, we will explain what cross-origin resource sharing (CORS) is, describe some common examples of cross-origin resource sharing based attacks, and discuss how to protect against these attacks.

What is CORS (cross-origin resource sharing)?
Cross-origin resource sharing (CORS) is a browser mechanism which enables controlled access to resources located outside of a given domain. It extends and adds flexibility to the same-origin policy (SOP). However, it also provides potential for cross-domain based attacks, if a website's CORS policy is poorly configured and implemented. CORS is not a protection against cross-origin attacks such as cross-site request forgery (CSRF).

Same-origin policy
The same-origin policy is a restrictive cross-origin specification that limits the ability for a website to interact with resources outside of the source domain. The same-origin policy was defined many years ago in response to potentially malicious cross-domain interactions, such as one website stealing private data from another. It generally allows a domain to issue requests to other domains, but not to access the responses.

Vulnerabilities arising from CORS configuration issues
Many modern websites use CORS to allow access from subdomains and trusted third parties. Their implementation of CORS may contain mistakes or be overly lenient to ensure that everything works, and this can result in exploitable vulnerabilities.

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[naiksister]

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