CVE-2024-1635: Undertow: out-of-memory error after several closed connections with wildfly-http-client protocol

Description

A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly-http-client protocol. Whenever a malicious user opens and closes a connection with the HTTP port of the server and then closes the connection immediately, the server will end with both memory and open file limits exhausted at some point, depending on the amount of memory available.

At HTTP upgrade to remoting, the WriteTimeoutStreamSinkConduit leaks connections if RemotingConnection is closed by Remoting ServerConnectionOpenListener. Because the remoting connection originates in Undertow as part of the HTTP upgrade, there is an external layer to the remoting connection. This connection is unaware of the outermost layer when closing the connection during the connection opening procedure. Hence, the Undertow WriteTimeoutStreamSinkConduit is not notified of the closed connection in this scenario. Because WriteTimeoutStreamSinkConduit creates a timeout task, the whole dependency tree leaks via that task, which is added to XNIO WorkerThread. So, the workerThread points to the Undertow conduit, which contains the connections and causes the leak.

Classification

CVE ID: CVE-2024-1635

Problem Types

Uncontrolled Resource Consumption

Affected Products

Vendor: , Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat, Red Hat

Product: , Red Hat Fuse 7.13.0, Red Hat JBoss Enterprise Application Platform 7, Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8, Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9, Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7, Red Hat Single Sign-On 7.6 for RHEL 7, Red Hat Single Sign-On 7.6 for RHEL 8, Red Hat Single Sign-On 7.6 for RHEL 9, RHEL-8 based Middleware Containers, RHSSO 7.6.8, OpenShift Serverless, Red Hat build of Apache Camel for Quarkus, Red Hat build of Apache Camel for Spring Boot 3, Red Hat build of Apache Camel for Spring Boot 4, Red Hat build of Apicurio Registry, Red Hat Build of Keycloak, Red Hat build of OptaPlanner 8, Red Hat build of Quarkus, Red Hat Data Grid 8, Red Hat Fuse 7, Red Hat Integration Camel K, Red Hat Integration Camel Quarkus, Red Hat JBoss Data Grid 7, Red Hat JBoss Enterprise Application Platform 8, Red Hat JBoss Fuse Service Works 6, Red Hat Process Automation 7, streams for Apache Kafka

Exploit Prediction Scoring System (EPSS)

EPSS Score: 63.28% (probability of being exploited)

EPSS Percentile: 98.25% (scored less or equal to compared to others)

EPSS Date: 2025-03-28 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

Timeline

2025-02-27 11:40:17 UTC
CVE

Undertow: out-of-memory error after several closed connections with wildfly-http-client protocol