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CVE-2021-21295— Netty 环境问题漏洞

一分钟漏洞结论

影响对象
netty io.netty:netty-codec-http2
利用判断
利用概率较高，应尽快评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 存在环境问题漏洞，该漏洞源于请求以HTTP 2流的形式传入，则被转换为HTTP 1.1对象。

CVSS 5.9 · Medium EPSS 18.89% · P97
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一、 漏洞 CVE-2021-21295 基础信息

漏洞信息
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Vulnerability Title
Possible request smuggling in HTTP/2 due missing validation
来源: CVE Program / CVE List V5
Vulnerability Description
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`.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
来源: CVE Program / CVE List V5
Vulnerability Title
Netty 环境问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 存在环境问题漏洞，该漏洞源于请求以HTTP 2流的形式传入，则被转换为HTTP 1.1对象。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
netty io.netty:netty-codec-http2 < 4.1.60.Final -

二、漏洞 CVE-2021-21295 的公开POC

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三、漏洞 CVE-2021-21295 的情报信息

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CVE-2021-21295 补丁与修复 (2)

CVE-2021-21295 厂商安全公告 (4)

CVE-2021-21295 邮件列表归档 (83)

IV. Related Vulnerabilities

Same vendor: netty
Same weakness: CWE-444

V. Comments for CVE-2021-21295

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