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.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Active_iq_unified_manager | Netapp | - (including) | - (including) |
| Oncommand_workflow_automation | Netapp | - (including) | - (including) |
| Red Hat build of Apache Camel 4.4.1 for Spring Boot 3.2 | RedHat | * | |
| Red Hat Fuse 7.13.0 | RedHat | * | |
| Red Hat JBoss Enterprise Application Platform 7 | RedHat | * | |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | RedHat | eap7-activemq-artemis-0:1.5.5.016-1.redhat_00001.1.ep7.el7 | * |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | RedHat | eap7-artemis-native-1:1.5.5.016-1.redhat_00001.1.ep7.el7 | * |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | RedHat | eap7-jboss-xnio-base-0:3.5.11-1.Final_redhat_00001.1.ep7.el7 | * |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | RedHat | eap7-jsoup-0:1.14.2-1.redhat_00002.1.ep7.el7 | * |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | RedHat | eap7-undertow-0:1.4.18-14.SP13_redhat_00001.1.ep7.el7 | * |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | RedHat | eap7-wildfly-0:7.1.10-2.GA_redhat_00002.1.ep7.el7 | * |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | RedHat | eap7-woodstox-core-0:5.0.3-2.redhat_00002.1.ep7.el7 | * |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | RedHat | eap7-xml-security-0:2.0.10-2.redhat_00002.1.ep7.el7 | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-jackson-annotations-0:2.10.4-3.redhat_00006.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-jackson-core-0:2.10.4-3.redhat_00006.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-jackson-databind-0:2.10.4-5.redhat_00006.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-jackson-jaxrs-providers-0:2.10.4-3.redhat_00006.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-jackson-modules-base-0:2.10.4-5.redhat_00006.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-jackson-modules-java8-0:2.10.4-2.redhat_00006.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-jboss-server-migration-0:1.7.2-16.Final_redhat_00017.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-netty-0:4.1.63-5.Final_redhat_00003.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-undertow-0:2.0.41-4.SP5_redhat_00001.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-wildfly-0:7.3.14-3.GA_redhat_00002.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | RedHat | eap7-wildfly-elytron-0:1.10.17-1.Final_redhat_00001.1.el7eap | * |
| Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8 | RedHat | eap7-undertow-0:2.2.30-1.SP1_redhat_00001.1.el8eap | * |
| Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9 | RedHat | eap7-undertow-0:2.2.30-1.SP1_redhat_00001.1.el9eap | * |
| Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7 | RedHat | eap7-undertow-0:2.2.30-1.SP1_redhat_00001.1.el7eap | * |
| Red Hat Single Sign-On 7.6 for RHEL 7 | RedHat | rh-sso7-keycloak-0:18.0.13-1.redhat_00001.1.el7sso | * |
| Red Hat Single Sign-On 7.6 for RHEL 8 | RedHat | rh-sso7-keycloak-0:18.0.13-1.redhat_00001.1.el8sso | * |
| Red Hat Single Sign-On 7.6 for RHEL 9 | RedHat | rh-sso7-keycloak-0:18.0.13-1.redhat_00001.1.el9sso | * |
| RHEL-8 based Middleware Containers | RedHat | rh-sso-7/sso76-openshift-rhel8:7.6-46 | * |
| RHSSO 7.6.8 | RedHat | undertow | * |
| Undertow | Ubuntu | bionic | * |
| Undertow | Ubuntu | focal | * |
| Undertow | Ubuntu | oracular | * |
| Undertow | Ubuntu | xenial | * |
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.