Log in Start free

Vulnerability · Published Feb 19, 2024 · Assigned by redhat

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

High 7.5

In plain English

A high-severity uncontrolled resource consumption in undertow. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.6% (higher than 92% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)4.6%top 8.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:14undertow2.3.18-1DEBIAN-CVE-2024-1635
Mavenio.undertow:undertow-core2.3.12.FinalGHSA-w6qf-42m7-vh68
Mavenio.undertow:undertow-core2.2.31.FinalGHSA-w6qf-42m7-vh68
Ubuntu:25.10undertowno fix listedUBUNTU-CVE-2024-1635
Ubuntu:26.04:LTSundertowno fix listedUBUNTU-CVE-2024-1635
Ubuntu:26.10undertowno fix listedUBUNTU-CVE-2024-1635

Affected products (as reported)

VendorProductVersions
undertow 1.31.0
Red Hat Red Hat build of Apache Camel 4.4.1 for Spring Boot 3.2 see references
Red Hat Red Hat Fuse 7.13.0 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.4.16 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7 see references
Red Hat Red Hat Single Sign-On 7.6 for RHEL 7 see references
Red Hat Red Hat Single Sign-On 7.6 for RHEL 8 see references
Red Hat Red Hat Single Sign-On 7.6 for RHEL 9 see references
Red Hat RHEL-8 based Middleware Containers see references

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References