OpenEMR is a free and open source electronic health records and medical practice management application. An Out-of-Band Server-Side Request Forgery (OOB SSRF) vulnerability was identified in OpenEMR, allowing an attacker to force the server to make unauthorized requests to external or internal resources. this attack does not return a direct response but can be exploited through DNS or HTTP interactions to exfiltrate sensitive information. This vulnerability is fixed in 7.0.3.1.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.