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HTTP Request Smuggling Affecting io.netty:netty-codec-http package, versions [,4.1.71.Final)

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Integrity High

    Threat Intelligence

    EPSS 0.24% (62nd percentile)
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NVD
6.5 medium
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SUSE
6.1 medium
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Red Hat
6.5 medium

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  • Snyk ID SNYK-JAVA-IONETTY-2314893
  • published 10 Dec 2021
  • disclosed 9 Dec 2021
  • credit Unknown
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Introduced: 9 Dec 2021

CVE-2021-43797 Open this link in a new tab
CWE-444 Open this link in a new tab

How to fix?

Upgrade io.netty:netty-codec-http to version 4.1.71.Final or higher.

Overview

io.netty:netty-codec-http is a network application framework for rapid development of maintainable high performance protocol servers & clients.

Affected versions of this package are vulnerable to HTTP Request Smuggling. Netty currently just skips control characters when these are present at the beginning or end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself.

References