Undertow Vulnerability Impacts Wildfly-HTTP-Client Server

CVE-2024-1635

Summary

A vulnerability has been identified within Undertow that affects servers utilizing the WildFly HTTP Client protocol. The issue occurs when a malicious actor exploits the behavior of connection handling, causing the server to exhaust its memory and file descriptor limits. This situation arises when a connection is opened and immediately closed at the HTTP port, leading to leaked connections via the WriteTimeoutStreamSinkConduit. Notably, if the RemotingConnection is closed by the Remoting ServerConnectionOpenListener, the connection's outermost layer fails to notify the Undertow conduit of the closure. Consequently, this lack of notification allows the timeout task to continue leaking connections through the XNIO WorkerThread, resulting in a prolonged impact on the server's resource consumption. Organizations are urged to address this vulnerability promptly to safeguard against potential denial-of-service scenarios.

References