Minio developers report:
Thanks to @phith0n from our community upon a code review, discovered an SSRF (Server Side Request Forgery) in our Browser API implementation. We have not observed this report/attack in the wild or reported elsewhere in the community at large.
All users are advised to upgrade ASAP.
The target application may have functionality for importing data from a URL, publishing data to a URL, or otherwise reading data from a URL that can be tampered with. The attacker modifies the calls to this functionality by supplying a completely different URL or by manipulating how URLs are built (path traversal etc.).
In a Server-Side Request Forgery (SSRF) attack, the attacker can abuse functionality on the server to read or update internal resources. The attacker can supply or modify a URL which the code running on the server will read or submit data, and by carefully selecting the URLs, the attacker may be able to read server configuration such as AWS metadata, connect to internal services like HTTP enabled databases, or perform post requests towards internal services which are not intended to be exposed.