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CVE-2023-34462

6.5 · MEDIUM

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

Published Jun 22, 2023CWE-400EPSS 2.46%

Overview

CVE-2023-34462 is a medium-severity vulnerability. It was published on June 22, 2023 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. The `SniHandler` can allocate up to 16MB of heap for each channel during the TLS handshake. When the handler or the channel does not have an idle timeout, it can be used to make a TCP server using the `SniHandler` to allocate 16MB of heap. The `SniHandler` class is a handler that waits for the TLS handshake to configure a `SslHandler` according to the indicated server name by the `ClientHello` record. For this matter it allocates a `ByteBuf` using the value defined in the `ClientHello` record. Normally the value of the packet should be smaller than the handshake packet but there are not checks done here and the way the code is written, it is possible to craft a packet that makes the `SslClientHelloHandler`. This vulnerability has been fixed in version 4.1.94.Final.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/netty/netty/commit/535da17e45201ae4278c0479e6162bb4127d4c32GitHubgithub.com/netty/netty/security/advisories/GHSA-6mjq-h674-j845Refsecurity.netapp.com/advisory/ntap-20230803-0001/Refsecurity.netapp.com/advisory/ntap-20240621-0007/Refwww.debian.org/security/2023/dsa-5558GitHubgithub.com/netty/netty/commit/535da17e45201ae4278c0479e6162bb4127d4c32GitHubgithub.com/netty/netty/security/advisories/GHSA-6mjq-h674-j845Refsecurity.netapp.com/advisory/ntap-20230803-0001/Refsecurity.netapp.com/advisory/ntap-20240621-0007/Refwww.debian.org/security/2023/dsa-5558

How CyberStrike helps

Frequently asked questions

What is CVE-2023-34462?

CVE-2023-34462 is a medium-severity vulnerability. It was published on June 22, 2023 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2023-34462?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-34462?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-34462?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-34462 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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