CVE-2024-3653 Undertow: learningpushhandler can lead to remote memory dos attacks
Attackers can cause remote memory denial of service in Undertow if the learning-push handler is enabled with default maxAge settings.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-3653?
CVE-2024-3653 is a medium-severity denial of service vulnerability in Red Hat OpenShift Serverless, published on 8 Jul 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 issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.
Weakness: CWE-401
Which versions are affected by CVE-2024-3653?
4 open source packages ship an affected version, including io.undertow:undertow-core.
| Package | Affected | Fixed in |
|---|---|---|
io.undertow:undertow-core Maven | All versions | 2.2.34.Final |
io.undertow:undertow-core Maven | All versions | 2.2.34.Final |
io.undertow:undertow-core Maven | From 2.3.0.Alpha1 | 2.3.15.Final |
io.undertow:undertow-core Maven | From 2.3.0.Alpha1 | 2.3.15.Final |
How do I fix CVE-2024-3653?
Upgrade io.undertow:undertow-core to a fixed version for your release line: 2.2.34.Final or 2.3.15.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-2024-3653 being exploited?
There is no known exploitation of CVE-2024-3653 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1786429829, DEBIAN-CVE-2024-3653, GHSA-ch7q-gpff-h9hp, UBUNTU-CVE-2024-3653.