CVE - CVE-2021-29509

CVE-ID
CVE-2021-29509	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://github.com/puma/puma/security/advisories/GHSA-q28m-8xjw-8vr5 URL:https://github.com/puma/puma/security/advisories/GHSA-q28m-8xjw-8vr5 GENTOO:GLSA-202208-28 URL:https://security.gentoo.org/glsa/202208-28 MISC:https://gist.github.com/nateberkopec/4b3ea5676c0d70cbb37c82d54be25837 URL:https://gist.github.com/nateberkopec/4b3ea5676c0d70cbb37c82d54be25837 MISC:https://github.com/puma/puma/security/policy URL:https://github.com/puma/puma/security/policy MISC:https://rubygems.org/gems/puma URL:https://rubygems.org/gems/puma MLIST:[debian-lts-announce] 20220827 [SECURITY] [DLA 3083-1] puma security update URL:https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20210330	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20210330)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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