Netty up to 4.1.60 Content-Length Header request smuggling

Summaryinfo

A vulnerability classified as critical was found in Netty up to 4.1.60. Impacted is an unknown function of the component Content-Length Header Handler. The manipulation results in request smuggling. This vulnerability is known as CVE-2021-21409. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Netty up to 4.1.60. Affected is an unknown function of the component Content-Length Header Handler. The manipulation with an unknown input leads to a request smuggling vulnerability. CWE is classifying the issue as CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was published 03/30/2021. The advisory is available at github.com. This vulnerability is traded as CVE-2021-21409. The technical details are unknown and an exploit is not available.

Upgrading to version 4.1.61.Final eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Netty

Version

• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.1.8
• 4.1.9
• 4.1.10
• 4.1.11
• 4.1.12
• 4.1.13
• 4.1.14
• 4.1.15
• 4.1.16
• 4.1.17
• 4.1.18
• 4.1.19
• 4.1.20
• 4.1.21
• 4.1.22
• 4.1.23
• 4.1.24
• 4.1.25
• 4.1.26
• 4.1.27
• 4.1.28
• 4.1.29
• 4.1.30
• 4.1.31
• 4.1.32
• 4.1.33
• 4.1.34
• 4.1.35
• 4.1.36
• 4.1.37
• 4.1.38
• 4.1.39
• 4.1.40
• 4.1.41
• 4.1.42
• 4.1.43
• 4.1.44
• 4.1.45
• 4.1.46
• 4.1.47
• 4.1.48
• 4.1.49
• 4.1.50
• 4.1.51
• 4.1.52
• 4.1.53
• 4.1.54
• 4.1.55
• 4.1.56
• 4.1.57
• 4.1.58
• 4.1.59
• 4.1.60

License

• open-source

Website

• Product: https://github.com/netty/netty/

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