![]() ![]() We can use the search functionality in Burp Suite to search for the headers quickly. When testing an application for CORS, we check if any of the application’s responses contain the CORS headers. Remote Code Execution in some cases ( StackStorm case).Cross-Site Scripting (XSS): Attackers can use CORS vulnerabilities to perform XSS attacks by injecting malicious scripts into web pages to steal session tokens or perform unauthorized actions on behalf of the user.Data Theft: Attackers can use CORS vulnerabilities to steal sensitive data from applications like API keys, SSH keys, Personal identifiable information (PII), or users’ credentials.#allow passing credenitals in the requestsĪccess-Control-Allow-Credentials: false Impact of CORS MisconfigurationsĬORS misconfigurations can have a significant impact on the security of web applications. If it is set to “false,” or not included in the response, then it is not allowed. If the header is set to “true,” the domain allows sending credentials. The value of the header is either True or False. #All domain are allowedĪccess-Control-Allow-Origin:, Īccess-Control-Allow-Credentials: This header determines whether the domain allows for passing credentials - such as cookies or authorization headers in the cross-origin requests. The value can be either a wildcard character (*), which indicates all domains are allowed, or a comma-separated list of domains. Īccess-Control-Allow-Origin: This header specifies the allowed domains to read the response contents. There are several HTTP headers related to CORS, but we are interested in the two related to the commonly seen vulnerabilities - Access-Control-Allow-Origin and Access-Control-Allow-Credentials. CORS rules allow domains to specify which domains can request information from them by adding specific HTTP headers in the response. What is Cross-Site Origin Policy (CORS)?ĬORS is a security feature created to selectively relax the SOP restrictions and enable controlled access to resources from different domains.I will use the Port Swigger CORS labs to demonstrate the testing and exploitation steps. We will also learn how to test and exploit the misconfigurations so that by the end of this guide, you will have a better understanding of how to test and validate for CORS during a pentest assessment. This article will cover the basics of how CORS works and identify common vulnerabilities that can occur when you don't implement CORS correctly. It's known as Cross-Origin Resource Sharing (CORS). ![]() For example, it presents challenges to APIs and microservices which have legitimate use cases for accessing and sharing information between domains.īecause of cases like this, there was a need for a new security mechanism that would allow for cross-domain interactions. ![]() The SOP policy helps protect users from malicious scripts that could access their sensitive data or perform unauthorized actions on their behalf.įor example, if tries to make an HTTP request to, the browser, by default, will block the request because it comes from a different domain.Īs much as the SOP sounds like a proper protection policy, it doesn’t scale well in today’s technologies that depend on each other for operation. It restricts domains from accessing and retrieving data from other domains’ resources. All web browsers implement a security model known as the Same-Origin Policy (SOP). ![]()
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