Vulnerability Information
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Vulnerability Title
Keepalive Connections Causing Denial Of Service in puma
Vulnerability Description
Puma is a concurrent HTTP 1.1 server for Ruby/Rack applications. The fix for CVE-2019-16770 was incomplete. The original fix only protected existing connections that had already been accepted from having their requests starved by greedy persistent-connections saturating all threads in the same process. However, new connections may still be starved by greedy persistent-connections saturating all threads in all processes in the cluster. A `puma` server which received more concurrent `keep-alive` connections than the server had threads in its threadpool would service only a subset of connections, denying service to the unserved connections. This problem has been fixed in `puma` 4.3.8 and 5.3.1. Setting `queue_requests false` also fixes the issue. This is not advised when using `puma` without a reverse proxy, such as `nginx` or `apache`, because you will open yourself to slow client attacks (e.g. slowloris). The fix is very small and a git patch is available for those using unsupported versions of Puma.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Vulnerability Title
Puma 资源管理错误漏洞
Vulnerability Description
Puma是美国Evan Phoenix个人开发者的一款针对高并发应用的Web服务器。 Puma 存在安全漏洞。该漏洞源于程序中的持久连接会使群集中所有进程中的所有线程饱和。
CVSS Information
N/A
Vulnerability Type
N/A