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CVE-2021-21409

Description

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.61.Final there is a vulnerability that enables request smuggling. The content-length header is not correctly validated if the request only uses a single Http2HeaderFrame with the endStream set to to true. This could lead to request smuggling if the request is proxied to a remote peer and translated to HTTP/1.1. This is a followup of GHSA-wm47-8v5p-wjpj/CVE-2021-21295 which did miss to fix this one case. This was fixed as part of 4.1.61.Final.

POC

Reference

- https://www.oracle.com//security-alerts/cpujul2021.html

- https://www.oracle.com/security-alerts/cpuapr2022.html

- https://www.oracle.com/security-alerts/cpujan2022.html

- https://www.oracle.com/security-alerts/cpuoct2021.html

Github

- https://github.com/cezapata/appconfiguration-sample

- https://github.com/n0-traces/cve_monitor