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CVE-2021-21294— Http4s Blaze 资源管理错误漏洞

一分钟漏洞结论

影响对象
http4s http4s
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
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。

Http4s Blaze是Http4s组织的一个基于java的用于处理网络流的NIO代码库。 Http4s Blaze 存在安全漏洞，该漏洞源于选择器池上无限制地接受连接。以下产品及版本受到影响：Http4s before versions 0.21.17, 0.22.0-M2, and 1.0.0-M14。

CVSS 7.5 · High EPSS 2.15% · P81
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一、 漏洞 CVE-2021-21294 基础信息

漏洞信息
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Vulnerability Title
Unbounded connection acceptance in http4s-blaze-server
来源: CVE Program / CVE List V5
Vulnerability Description
Http4s (http4s-blaze-server) is a minimal, idiomatic Scala interface for HTTP services. Http4s before versions 0.21.17, 0.22.0-M2, and 1.0.0-M14 have a vulnerability which can lead to a denial-of-service. Blaze-core, a library underlying http4s-blaze-server, accepts connections unboundedly on its selector pool. This has the net effect of amplifying degradation in services that are unable to handle their current request load, since incoming connections are still accepted and added to an unbounded queue. Each connection allocates a socket handle, which drains a scarce OS resource. This can also confound higher level circuit breakers which work based on detecting failed connections. http4s provides a general "MaxActiveRequests" middleware mechanism for limiting open connections, but it is enforced inside the Blaze accept loop, after the connection is accepted and the socket opened. Thus, the limit only prevents the number of connections which can be simultaneously processed, not the number of connections which can be held open. In 0.21.17, 0.22.0-M2, and 1.0.0-M14, a new "maxConnections" property, with a default value of 1024, has been added to the `BlazeServerBuilder`. Setting the value to a negative number restores unbounded behavior, but is strongly disrecommended. The NIO2 backend does not respect `maxConnections`. Its use is now deprecated in http4s-0.21, and the option is removed altogether starting in http4s-0.22. There are several possible workarounds described in the refrenced GitHub Advisory GHSA-xhv5-w9c5-2r2w.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
来源: CVE Program / CVE List V5
Vulnerability Title
Http4s Blaze 资源管理错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Http4s Blaze是Http4s组织的一个基于java的用于处理网络流的NIO代码库。 Http4s Blaze 存在安全漏洞，该漏洞源于选择器池上无限制地接受连接。以下产品及版本受到影响：Http4s before versions 0.21.17, 0.22.0-M2, and 1.0.0-M14。
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
http4s http4s < 0.21.17 -

二、漏洞 CVE-2021-21294 的公开POC

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三、漏洞 CVE-2021-21294 的情报信息

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CVE-2021-21294 补丁与修复 (1)

CVE-2021-21294 厂商安全公告 (1)

IV. Related Vulnerabilities

Same product: http4s
Same vendor: http4s
Same weakness: CWE-400

V. Comments for CVE-2021-21294

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