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bdu:2021-05079

EUVD-2026-26399

fkie_cve-2021-29509

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.

GHSA-q28m-8xjw-8vr5 — Puma's Keepalive Connections Causing Denial Of Service

Affected: RubyGems: puma

This vulnerability is related to [CVE-2019-16770](https://github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994).

### Impact

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.

### Patches

This problem has been fixed in `puma` 4.3.8 and 5.3.1.

### Workarounds

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](https://en.wikipedia.org/wiki/Slowloris_(computer_security))).

The fix is very small. [A git patch is available here](https://gist.github.com/nateberkopec/4b3ea5676c0d70cbb37c82d54be25837) for those using [unsupported versions](https://github.com/puma/puma/security/policy#supported-versions) of Puma.

### For more information

If you have any questions or comments about this advisory:

* Open an issue in [Puma](https://github.com/puma/puma). * To report problems with this f…

gsd-2021-29509

OESA-2021-1203 — rubygem-puma security update

Affected: openEuler:20.03-LTS-SP1: rubygem-puma

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)

openSUSE-SU-2024:12592-1 — ruby3.1-rubygem-puma-5-5.6.5-1.1 on GA media

ruby3.1-rubygem-puma-5-5.6.5-1.1 on GA media

RHSA-2021:4702 — Red Hat Security Advisory: Satellite 6.10 Release

python-ecdsa: Unexpected and undocumented exceptions during signature decoding python-ecdsa: DER encoding is not being verified in signatures rubygem-activerecord-session_store: hijack sessions by using timing attacks targeting the session id rake: OS Command Injection via egrep in Rake::FileList guava: local information disclosure via temporary directory created with unsafe permissions PyYAML: incomplete fix for CVE-2020-1747 rubygem-nokogiri: XML external entity injection via Nokogiri::XML::Schema Satellite: Azure compute resource secret_key leak to authenticated users foreman: possible man-in-the-middle in smart_proxy realm_freeipa Satellite: BMC controller credential leak via API python-aiohttp: Open redirect in aiohttp.web_middlewares.normalize_path_middleware rubygem-actionpack: Possible Information Disclosure / Unintended Method Execution in Action Pack rails: Possible Denial of Service vulnerability in Action Dispatch rails: Possible DoS Vulnerability in Action Controller Token Authentication django: potential directory-traversal via uploaded files rubygem-puma: incomplete fix for CVE-2019-16770 allows Denial of Service (DoS) django: Potential directory-traversal via uploaded files rubygem-addressable: ReDoS in templates django: Potential directory traversal via ``admindocs`` python-urllib3: ReDoS in the parsing of authority part of URL django: Possible indeterminate SSRF, RFI, and LFI attacks since validators accepted leading zeros in IPv4 addresses

SUSE-SU-2021:2761-1 — Security update for rubygem-puma

Security update for rubygem-puma

Withdrawn: UBUNTU-CVE-2021-29509

Withdrawn by the publisher.

Affected: Ubuntu:20.04:LTS: puma, Ubuntu:22.04:LTS: puma