NVD - CVE-2021-21295

CVE-2021-21295 Detail

Modified

This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.

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 4.1.60.Final there is a vulnerability that enables request smuggling. If a Content-Length header is present in the original HTTP/2 request, the field is not validated by `Http2MultiplexHandler` as it is propagated up. This is fine as long as the request is not proxied through as HTTP/1.1. If the request comes in as an HTTP/2 stream, gets converted into the HTTP/1.1 domain objects (`HttpRequest`, `HttpContent`, etc.) via `Http2StreamFrameToHttpObjectCodec `and then sent up to the child channel's pipeline and proxied through a remote peer as HTTP/1.1 this may result in request smuggling. In a proxy case, users may assume the content-length is validated somehow, which is not the case. If the request is forwarded to a backend channel that is a HTTP/1.1 connection, the Content-Length now has meaning and needs to be checked. An attacker can smuggle requests inside the body as it gets downgraded from HTTP/2 to HTTP/1.1. For an example attack refer to the linked GitHub Advisory. Users are only affected if all of this is true: `HTTP2MultiplexCodec` or `Http2FrameCodec` is used, `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 in 4.1.60.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`.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

CNA: GitHub, Inc.

Base Score: 5.9 MEDIUM

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: 2.6 LOW

Vector: (AV:N/AC:H/Au:N/C:N/I:P/A:N)

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://github.com/Netflix/zuul/pull/980	Patch Third Party Advisory
https://github.com/netty/netty/commit/89c241e3b1795ff257af4ad6eadc616cb2fb3dc4	Patch Vendor Advisory
https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj	Third Party Advisory
https://lists.apache.org/thread.html/r02e467123d45006a1dda20a38349e9c74c3a4b53e2e07be0939ecb3f%40%3Cdev.ranger.apache.org%3E
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https://security.netapp.com/advisory/ntap-20210604-0003/	Third Party Advisory
https://www.debian.org/security/2021/dsa-4885	Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	Patch Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-444	Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')	NIST GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

55 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-21295
NVD Published Date:
03/09/2021
NVD Last Modified:
11/06/2023
Source:
GitHub, Inc.

CVE-2021-21295 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by GitHub, Inc. 5/14/2024 4:09:39 AM

CVE Modified by GitHub, Inc. 11/06/2023 10:29:44 PM

Modified Analysis by NIST 5/12/2022 10:34:45 AM

CVE Modified by GitHub, Inc. 4/19/2022 8:15:42 PM

Modified Analysis by NIST 12/09/2021 9:09:25 PM

CVE Modified by GitHub, Inc. 10/20/2021 12:15:07 PM

CVE Modified by GitHub, Inc. 9/28/2021 4:15:07 AM

Modified Analysis by NIST 9/14/2021 2:48:55 PM

CVE Modified by GitHub, Inc. 9/07/2021 3:15:07 PM

CVE Modified by GitHub, Inc. 9/04/2021 6:15:07 AM

CVE Modified by GitHub, Inc. 9/04/2021 5:15:07 AM

CVE Modified by GitHub, Inc. 8/06/2021 4:15:07 PM

CVE Modified by GitHub, Inc. 7/26/2021 2:15:07 AM

CVE Modified by GitHub, Inc. 7/09/2021 2:15:08 PM

CVE Modified by GitHub, Inc. 7/06/2021 11:15:17 PM

CVE Modified by GitHub, Inc. 7/06/2021 12:15:18 PM

CVE Modified by GitHub, Inc. 6/18/2021 8:15:07 PM

CVE Modified by GitHub, Inc. 6/15/2021 5:15:08 PM

Modified Analysis by NIST 6/11/2021 9:38:07 AM

CVE Modified by GitHub, Inc. 6/10/2021 8:15:08 PM

Modified Analysis by NIST 6/10/2021 9:27:44 AM

CVE Modified by GitHub, Inc. 6/10/2021 6:15:07 AM

CVE Modified by GitHub, Inc. 6/04/2021 6:15:07 AM

CVE Modified by GitHub, Inc. 5/11/2021 9:15:11 AM

CVE Modified by GitHub, Inc. 5/07/2021 1:15:07 AM

CVE Modified by GitHub, Inc. 4/30/2021 10:15:13 PM

CVE Modified by GitHub, Inc. 4/26/2021 6:15:12 AM

CVE Modified by GitHub, Inc. 4/24/2021 11:15:07 AM

CVE Modified by GitHub, Inc. 4/06/2021 8:15:16 AM

CVE Modified by GitHub, Inc. 4/02/2021 11:15:13 PM

CVE Modified by GitHub, Inc. 4/02/2021 4:15:12 PM

CVE Modified by GitHub, Inc. 4/02/2021 12:15:13 PM

CVE Modified by GitHub, Inc. 4/02/2021 8:15:32 AM

CVE Modified by GitHub, Inc. 4/02/2021 5:15:12 AM

CVE Modified by GitHub, Inc. 4/01/2021 11:15:13 AM

CVE Modified by GitHub, Inc. 4/01/2021 5:15:12 AM

CVE Modified by GitHub, Inc. 3/31/2021 11:15:14 PM

CVE Modified by GitHub, Inc. 3/31/2021 2:15:14 PM

CVE Modified by GitHub, Inc. 3/31/2021 11:15:15 AM

CVE Modified by GitHub, Inc. 3/31/2021 10:15:17 AM

CVE Modified by GitHub, Inc. 3/31/2021 9:15:13 AM

CVE Modified by GitHub, Inc. 3/31/2021 8:15:12 AM

CVE Modified by GitHub, Inc. 3/31/2021 6:15:12 AM

CVE Modified by GitHub, Inc. 3/31/2021 5:15:12 AM

CVE Modified by GitHub, Inc. 3/30/2021 1:15:17 PM

CVE Modified by GitHub, Inc. 3/30/2021 7:15:13 AM

CVE Modified by GitHub, Inc. 3/30/2021 12:15:11 AM

CVE Modified by GitHub, Inc. 3/29/2021 1:15:15 PM

CVE Modified by GitHub, Inc. 3/29/2021 10:15:17 AM

Initial Analysis by NIST 3/25/2021 10:00:19 AM

CVE Modified by GitHub, Inc. 3/18/2021 4:15:12 AM

CVE Modified by GitHub, Inc. 3/18/2021 3:15:13 AM

CVE Modified by GitHub, Inc. 3/18/2021 1:15:13 AM

CVE Modified by GitHub, Inc. 3/17/2021 3:15:12 PM

CVE Modified by GitHub, Inc. 3/17/2021 8:15:12 AM

Quick Info