[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$flfW9HVCFy5M8EEKytYA-iY1ziGiyO3p2w9UmkZ6hZHY":3,"g5a-risk:CVE-2021-21295":338},{"success":4,"data":5,"meta":336},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":43,"epssPercentile":26,"epssTimeSeries":44,"severity":45,"affectedProducts":46,"affectedProductsCount":80,"references":81,"referencesCount":237,"weaknesses":238,"weaknessesCount":247,"isActivelyExploited":248,"cisaInfo":26,"otxData":26,"relatedBlogPosts":249,"seoMetadata":250,"configurations":275,"relatedVendorCves":320,"notableEvents":321},"CVE-2021-21295","What is CVE-2021-21295?","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\u002F2 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\u002F1.1. If the request comes in as an HTTP\u002F2 stream, gets converted into the HTTP\u002F1.1 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\u002F1.1 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\u002F1.1 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\u002F2 to HTTP\u002F1.1. 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\u002F1.1 objects, and these HTTP\u002F1.1 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`.","Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & 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Interpretation of HTTP Requests ('HTTP Request\u002FResponse Smuggling')","The product acts as an intermediary HTTP agent\n         (such as a proxy or firewall) in the data flow between two\n         entities such as a client and server, but it does not\n         interpret malformed HTTP requests or responses in ways that\n         are consistent with how the messages will be processed by\n         those entities that are at the ultimate destination.","HTTP requests or responses (\"messages\") can be\n\t   malformed or unexpected in ways that cause web servers or\n\t   clients to interpret the messages in different ways than\n\t   intermediary HTTP agents such as load balancers, reverse\n\t   proxies, web caching proxies, application firewalls,\n\t   etc. For example, an adversary may be able to add duplicate\n\t   or different header fields that a client or server might\n\t   interpret as one set of messages, whereas the intermediary\n\t   might interpret the same sequence of bytes as a different\n\t   set of messages. For example, discrepancies can arise in\n\t   how to handle duplicate headers like two Transfer-encoding\n\t   (TE) or two Content-length (CL), or the malicious HTTP\n\t   message will have different headers for TE and\n\t   CL.\nThe inconsistent parsing and interpretation of messages\n\t   can allow the adversary to \"smuggle\" a message to the\n\t   client\u002Fserver without the intermediary being aware of it.\nThis weakness is usually the result of the usage\n\t   of outdated or incompatible HTTP protocol versions in the\n\t   HTTP agents.","Incomplete","Base","Simple",1,false,[],{"title":251,"metaDescription":252,"keywords":253,"canonicalUrl":254,"structuredData":255},"What is CVE-2021-21295? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-21295, a medium severity cyber security vulnerability from 2021. 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