DescriptionNetty 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`.
Overall state of this security issue: Running
This issue is currently rated as having moderate severity.
|National Vulnerability Database|
|National Vulnerability Database||SUSE|
- openSUSE-SU-2021:0448-1, published Fri Mar 19 18:40:23 2021
List of released packages
|Product(s)||Fixed package version(s)||References|
|SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 SP2|| ||Patchnames: |
|openSUSE Leap 15.2|| ||Patchnames: |
|openSUSE Tumbleweed|| ||Patchnames: |
openSUSE Tumbleweed GA netty-4.1.60-1.4
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.
|SUSE Linux Enterprise Module for Development Tools 15 SP2||netty3||Not affected|
|SUSE Manager Server 4.0 Module||netty||Unsupported|
|SUSE Manager Server 4.1 Module||netty||Affected|