CVE-2021-29509 (GCVE-0-2021-29509)

Vulnerability from cvelistv5 – Published: 2021-05-11 16:50 – Updated: 2024-08-03 22:11
VLAI
Title
Keepalive Connections Causing Denial Of Service in puma
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-400 - {"CWE-400":"Uncontrolled Resource Consumption"}
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
puma puma Affected: < 4.3.8
Affected: >= 5.0.0, < 5.3.1
Create a notification for this product.
Show details on NVD website
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