Denial Of Service (DoS)

servicemesh-proxy is vulnerable to denial of service. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade. A flaw was found in envoy. When a cluster is deleted via the Cluster Discovery Service, a stack exhaustion may occur.