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CVE-2021-21295: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

March 9, 2021 (updated November 7, 2023)

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Http2StreamFrameToHttpObjectCodec is used to convert to HTTP/1.1 objects, and these HTTP/1.1 objects are forwarded to another remote peer. This has been patched Final As a workaround, the user can do the validation by themselves by implementing a custom ChannelInboundHandler that is put in the ChannelPipeline behind Http2StreamFrameToHttpObjectCodec.

References

  • github.com/Netflix/zuul/pull/980
  • github.com/netty/netty/commit/89c241e3b1795ff257af4ad6eadc616cb2fb3dc4
  • github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj
  • nvd.nist.gov/vuln/detail/CVE-2021-21295
  • www.debian.org/security/2021/dsa-4885

Code Behaviors & Features

Detect and mitigate CVE-2021-21295 with GitLab Dependency Scanning

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Affected versions

Version 3.5.9

Fixed versions

  • 3.5.10

Solution

Upgrade to version 3.5.10 or above.

Impact 5.9 MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Source file

maven/org.apache.zookeeper/zookeeper/CVE-2021-21295.yml

Spotted a mistake? Edit the file on GitLab.

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