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

What is CVE-2024-1635?

CVE-2024-1635 is a high-severity denial of service vulnerability in Netapp Active Iq Unified Manager, published on 19 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-400

Which versions are affected by CVE-2024-1635?

4 open source packages ship an affected version, including io.undertow:undertow-core. It affects 9 products.

Products include Netapp Active Iq Unified Manager, Netapp Oncommand Workflow Automation, Redhat Fuse, Redhat Integration Camel for Spring Boot, Redhat Jboss Enterprise Application Platform, Redhat Openshift Container Platform and 3 more.

How do I fix CVE-2024-1635?

Upgrade io.undertow:undertow-core to a fixed version for your release line: 2.2.31.Final or 2.3.12.Final.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-1635 being exploited?

There is no known exploitation of CVE-2024-1635 in the wild and no public exploit code.

Other vulnerabilities in Netapp Active Iq Unified Manager

• CVE-2022-31692 Spring Security authorization rules can be bypassed via forward or include dispatcher types Critical 9.8
• CVE-2022-2526 Use after free in systemd-resolved Critical 9.8
• CVE-2022-22978 Authorization bypass in Spring Security Critical 9.8
• CVE-2021-22931 Code injection in Node Critical 9.8
• CVE-2018-2938 Code injection in Java Critical 9.0

All Netapp Active Iq Unified Manager vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLSA-2026-1781139194, DEBIAN-CVE-2024-1635, GHSA-w6qf-42m7-vh68, UBUNTU-CVE-2024-1635.