CVE-2021-21295
Publication date 9 March 2021
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
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`.
Status
Package | Ubuntu Release | Status |
---|---|---|
netty | 24.10 oracular |
Needs evaluation
|
24.04 LTS noble |
Needs evaluation
|
|
22.04 LTS jammy |
Fixed 1:4.1.48-4+deb11u1build0.22.04.1
|
|
20.04 LTS focal |
Fixed 1:4.1.45-1ubuntu0.1~esm1
|
|
18.04 LTS bionic |
Fixed 1:4.1.7-4ubuntu0.1+esm2
|
|
16.04 LTS xenial |
Fixed 1:4.0.34-1ubuntu0.1~esm1
|
|
14.04 LTS trusty | Ignored end of ESM support, was needs-triage |
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Get Ubuntu ProSeverity score breakdown
Parameter | Value |
---|---|
Base score | 5.9 · Medium |
Attack vector | Network |
Attack complexity | High |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | High |
Availability impact | None |
Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-6049-1
- Netty vulnerabilities
- 28 April 2023