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CVE-2021-29509

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2021-4702-01
Posted Nov 17, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4702-01 - Red Hat Satellite is a systems management tool for Linux-based infrastructure. It allows for provisioning, remote management, and monitoring of multiple Linux deployments with a single centralized tool. Issues addressed include XML injection, code execution, denial of service, information leakage, local file inclusion, man-in-the-middle, memory leak, open redirection, password leak, remote file inclusion, remote shell upload, and traversal vulnerabilities.

tags | advisory, remote, denial of service, shell, local, vulnerability, code execution, memory leak, file inclusion
systems | linux, redhat
advisories | CVE-2019-14853, CVE-2019-14859, CVE-2019-25025, CVE-2020-14343, CVE-2020-26247, CVE-2020-8130, CVE-2020-8908, CVE-2021-20256, CVE-2021-21330, CVE-2021-22885, CVE-2021-22902, CVE-2021-22904, CVE-2021-28658, CVE-2021-29509, CVE-2021-31542, CVE-2021-32740, CVE-2021-33203, CVE-2021-33503, CVE-2021-33571, CVE-2021-3413, CVE-2021-3494
MD5 | 15d37f280e159b35ed6469b1f97ed672
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