Dragonfly scheduler v1 and v2 gRPC unauthenticated SSRF via attacker-controlled PeerHost in DownloadTinyFile

Summary The Dragonfly scheduler's v1 gRPC service contains an unauthenticated Server-Side Request Forgery SSRF. When a peer reports a successful download of a TINY task, the scheduler calls Peer.DownloadTinyFile and issues an HTTP GET to a host and port taken verbatim from the attacker-controlled...