Resource Exhaustion Affecting ruby2.5-rubygem-puma package, versions <4.3.11-150000.3.6.2
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Test your applications- Snyk ID SNYK-SLES152-RUBY25RUBYGEMPUMA-2808507
- published 5 May 2022
- disclosed 4 May 2022
Introduced: 4 May 2022
CVE-2021-29509 Open this link in a new tabHow to fix?
Upgrade SLES:15.2 ruby2.5-rubygem-puma to version 4.3.11-150000.3.6.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby2.5-rubygem-puma package and not the ruby2.5-rubygem-puma package as distributed by SLES.
See How to fix? for SLES:15.2 relevant fixed versions and status.
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.
References
- https://www.suse.com/security/cve/CVE-2021-29509.html
- https://bugzilla.suse.com/1188527
- https://rubygems.org/gems/puma
- https://github.com/puma/puma/security/policy
- https://github.com/puma/puma/security/advisories/GHSA-q28m-8xjw-8vr5
- https://gist.github.com/nateberkopec/4b3ea5676c0d70cbb37c82d54be25837
- https://security.gentoo.org/glsa/202208-28
- https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html