CVE-2020-36851— cors-anywhere 安全漏洞

Rob--W cors-anywhere Misconfigured CORS Proxy Allows SSRF

Rob--W cors-anywhere instances configured as an open proxy allow unauthenticated external users to induce the server to make HTTP requests to arbitrary targets (SSRF). Because the proxy forwards requests and headers, an attacker can reach internal-only endpoints and link-local metadata services, retrieve instance role credentials or other sensitive metadata, and interact with internal APIs and services that are not intended to be internet-facing. The vulnerability is exploitable by sending crafted requests to the proxy with the target resource encoded in the URL; many cors-anywhere deployments forward arbitrary methods and headers (including PUT), which can permit exploitation of IMDSv2 workflows as well as access to internal management APIs. Successful exploitation can result in theft of cloud credentials, unauthorized access to internal services, remote code execution or privilege escalation (depending on reachable backends), data exfiltration, and full compromise of cloud resources. Mitigation includes: restricting the proxy to trusted origins or authentication, whitelisting allowed target hosts, preventing access to link-local and internal IP ranges, removing support for unsafe HTTP methods/headers, enabling cloud provider mitigations, and deploying network-level protections.

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过度许可的跨域白名单

cors-anywhere 安全漏洞

cors-anywhere是Rob Wu个人开发者的一个NodeJS的反向代理。 cors-anywhere存在安全漏洞，该漏洞源于配置为开放代理时允许未经验证的外部用户诱导服务器向任意目标发出HTTP请求，可能导致服务端请求伪造攻击。

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