{"schema_version":"1.7.5","id":"GHSA-wm47-8v5p-wjpj","published":"2021-03-09T18:49:49Z","modified":"2026-03-13T22:00:46.030064Z","aliases":["BIT-zookeeper-2021-21295","CVE-2021-21295"],"related":["CGA-hw8x-848c-wv4m","CVE-2021-21295","CVE-2021-21409"],"summary":"Possible request smuggling in HTTP/2 due missing validation","details":"### Impact\nIf 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.\nIf 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.  \n\nIn 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.\n\nAn attacker can smuggle requests inside the body as it gets downgraded from HTTP/2 to HTTP/1.1.   A sample attack request looks like:\n\n```\nPOST / HTTP/2\n:authority:: externaldomain.com\nContent-Length: 4\n\nasdfGET /evilRedirect HTTP/1.1\nHost: internaldomain.com\n```\n\nUsers are only affected if all of this is `true`:\n * `HTTP2MultiplexCodec` or `Http2FrameCodec` is used\n * `Http2StreamFrameToHttpObjectCodec` is used to convert to HTTP/1.1 objects\n * These  HTTP/1.1 objects are forwarded to another remote peer.\n \n\n### Patches\nThis has been patched in 4.1.60.Final\n\n### Workarounds\nThe user can do the validation by themselves by implementing a custom `ChannelInboundHandler` that is put in the `ChannelPipeline` behind `Http2StreamFrameToHttpObjectCodec`.\n\n### References\nRelated change to workaround the problem: https://github.com/Netflix/zuul/pull/980 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4.0.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-wm47-8v5p-wjpj/GHSA-wm47-8v5p-wjpj.json"}},{"package":{"name":"io.netty:netty","ecosystem":"Maven","purl":"pkg:maven/io.netty/netty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.0.Final","3.10.1.Final","3.10.2.Final","3.10.3.Final","3.10.4.Final","3.10.5.Final","3.10.6.Final","3.3.0.Final","3.3.1.Final","3.4.0.Alpha1","3.4.0.Alpha2","3.4.0.Beta1","3.4.0.Final","3.4.1.Final","3.4.2.Final","3.4.3.Final","3.4.4.Final","3.4.5.Final","3.4.6.Final","3.5.0.Beta1","3.5.0.Final","3.5.1.Final","3.5.10.Final","3.5.11.Final","3.5.12.Final","3.5.13.Final","3.5.2.Final","3.5.3.Final","3.5.4.Final","3.5.5.Final","3.5.6.Final","3.5.7.Final","3.5.8.Final","3.5.9.Final","3.6.0.Beta1","3.6.0.Final","3.6.1.Final","3.6.10.Final","3.6.2.Final","3.6.3.Final","3.6.4.Final","3.6.5.Final","3.6.6.Final","3.6.7.Final","3.6.8.Final","3.6.9.Final","3.7.0.Final","3.7.1.Final","3.8.0.Final","3.8.1.Final","3.8.2.Final","3.8.3.Final","3.9.0.Final","3.9.1.1.Final","3.9.1.Final","3.9.2.Final","3.9.3.Final","3.9.4.Final","3.9.5.Final","3.9.6.Final","3.9.7.Final","3.9.8.Final","3.9.9.Final","4.0.0.Alpha1","4.0.0.Alpha2","4.0.0.Alpha3","4.0.0.Alpha4","4.0.0.Alpha5","4.0.0.Alpha6","4.0.0.Alpha7","4.0.0.Alpha8"],"database_specific":{"last_known_affected_version_range":"< 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