OESA-2021-1203

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OESA-2021-1203

Summary: rubygem-puma security update

Details: A simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications. Security Fix(es): 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.(CVE-2021-29509)

References: https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1203, https://nvd.nist.gov/vuln/detail/CVE-2021-29509