{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"moderate"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2021-21295","title":"Title"},{"category":"description","text":"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`.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2021-21295","url":"https://www.suse.com/security/cve/CVE-2021-21295"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1183262 for CVE-2021-21295","url":"https://bugzilla.suse.com/1183262"},{"category":"external","summary":"SUSE Bug 1184203 for CVE-2021-21295","url":"https://bugzilla.suse.com/1184203"},{"category":"external","summary":"Advisory link for SUSE-SU-2022:1271-1","url":"https://lists.suse.com/pipermail/sle-security-updates/2022-April/010773.html"},{"category":"external","summary":"Advisory link for openSUSE-SU-2021:0448-1","url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/XDF63Q7PJ5ZO6J24Z3YJ7WWZWTTROVC2/"}],"title":"SUSE CVE CVE-2021-21295","tracking":{"current_release_date":"2025-08-15T23:33:47Z","generator":{"date":"2023-02-15T03:46:24Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2021-21295","initial_release_date":"2023-02-15T03:46:24Z","revision_history":[{"date":"2023-02-15T03:46:24Z","number":"2","summary":"Current version"},{"date":"2025-01-01T04:46:28Z","number":"3","summary":"Current version"},{"date":"2025-01-10T02:51:14Z","number":"4","summary":"Current version"},{"date":"2025-02-15T05:20:55Z","number":"5","summary":"Current version"},{"date":"2025-02-17T05:47:05Z","number":"6","summary":"Current version"},{"date":"2025-03-15T09:11:22Z","number":"7","summary":"Current version"},{"date":"2025-04-02T09:39:44Z","number":"8","summary":"Current version"},{"date":"2025-04-08T02:35:26Z","number":"9","summary":"Current version"},{"date":"2025-05-17T05:43:57Z","number":"10","summary":"Current version"},{"date":"2025-06-26T04:16:04Z","number":"11","summary":"Current version"},{"date":"2025-07-01T01:04:01Z","number":"12","summary":"Current version"},{"date":"2025-08-15T23:33:47Z","number":"13","summary":"Current version"}],"status":"interim","version":"13"}},"product_tree":{"branches":[{"branches":[{"branches":[{"category":"product_name","name":"SUSE CaaS Platform 4.5","product":{"name":"SUSE CaaS Platform 4.5","product_id":"SUSE CaaS Platform 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CVE Page","text":"https://www.suse.com/security/cve/CVE-2021-21295"}],"notes":[{"category":"general","text":"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`.","title":"CVE description"}],"product_status":{"known_not_affected":["SUSE CaaS Platform 4.5:netty3","SUSE Enterprise Storage 7.1:netty3","SUSE Enterprise Storage 7:netty3","SUSE Linux Enterprise Desktop 15 SP2:netty3","SUSE Linux Enterprise Desktop 15 SP3:netty3","SUSE Linux Enterprise Desktop 15 SP4:netty3","SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS:netty3","SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:netty3","SUSE Linux Enterprise High Performance Computing 15 SP2:netty3","SUSE Linux Enterprise High Performance Computing 15 SP3:netty3","SUSE Linux Enterprise High Performance Computing 15 SP4:netty3","SUSE Linux Enterprise Module for Development Tools 15 SP2:netty3","SUSE Linux Enterprise Module for Development Tools 15 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