The OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Server Side Request Forgery (SSRF) vulnerability. The vulnerability arises due to unsafe usage of the logo_uri parameter in the Dynamic Client Registration request. An unauthenticated attacker can make a HTTP request from the vulnerable server to any address in the internal network and obtain its response (which might, for example, have a JavaScript payload for resultant XSS). The issue can be exploited to bypass network boundaries, obtain sensitive data, or attack other hosts in the internal network.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-26715
• https://github.com/mitreid-connect/OpenID-Connect-Java-Spring-Server/releases
• https://portswigger.net/research/hidden-oauth-attack-vectors