Undertow Vulnerability: Enabling Learning-Push Handler Can Prevent Attacks

CVE-2024-3653

What is CVE-2024-3653?

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.

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