CVE-2023-49803— koajs cors 安全漏洞

@koa/cors has overly permissive origin policy

@koa/cors npm provides Cross-Origin Resource Sharing (CORS) for koa, a web framework for Node.js. Prior to version 5.0.0, the middleware operates in a way that if an allowed origin is not provided, it will return an `Access-Control-Allow-Origin` header with the value of the origin from the request. This behavior completely disables one of the most crucial elements of browsers - the Same Origin Policy (SOP), this could cause a very serious security threat to the users of this middleware. If such behavior is expected, for instance, when middleware is used exclusively for prototypes and not for production applications, it should be heavily emphasized in the documentation along with an indication of the risks associated with such behavior, as many users may not be aware of it. Version 5.0.0 fixes this vulnerability.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

源验证错误

koajs cors 安全漏洞

koajs cors是koa 的跨源资源共享。 koajs cors 5.0.0 之前版本存在安全漏洞，该漏洞源于如果未提供允许的来源，它将返回一个Access-Control-Allow-Origin标头，其中包含请求中的来源值，会对使用该中间件的用户造成非常严重的安全威胁。

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