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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTd4eDMtbTU4NC14OTk0

A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack

Keepalive thread overload/DoS

Impact

A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack.

If more keepalive connections to Puma are opened than there are threads available, additional connections will wait permanently if the attacker sends requests frequently enough.

Patches

This vulnerability is patched in Puma 4.3.1 and 3.12.2.

Workarounds

Reverse proxies in front of Puma could be configured to always allow less than X keepalive connections to a Puma cluster or process, where X is the number of threads configured in Puma's thread pool.

For more information

If you have any questions or comments about this advisory:

Permalink: https://github.com/advisories/GHSA-7xx3-m584-x994
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTd4eDMtbTU4NC14OTk0
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 4 years ago
Updated: 12 months ago


CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Identifiers: GHSA-7xx3-m584-x994, CVE-2019-16770
References: Repository: https://github.com/puma/puma
Blast Radius: 29.7

Affected Packages

rubygems:puma
Dependent packages: 627
Dependent repositories: 404,320
Downloads: 357,648,490 total
Affected Version Ranges: >= 4.0.0, < 4.3.1, < 3.12.2
Fixed in: 4.3.1, 3.12.2
All affected versions: 0.8.0, 0.8.1, 0.8.2, 0.9.0, 0.9.1, 0.9.2, 0.9.3, 0.9.4, 0.9.5, 1.0.0, 1.1.0, 1.1.1, 1.2.0, 1.2.1, 1.2.2, 1.3.0, 1.3.1, 1.4.0, 1.5.0, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 2.0.0, 2.0.1, 2.1.0, 2.1.1, 2.2.0, 2.2.1, 2.2.2, 2.3.0, 2.3.1, 2.3.2, 2.4.0, 2.4.1, 2.5.0, 2.5.1, 2.6.0, 2.7.0, 2.7.1, 2.8.0, 2.8.1, 2.8.2, 2.9.0, 2.9.1, 2.9.2, 2.10.0, 2.10.1, 2.10.2, 2.11.0, 2.11.1, 2.11.2, 2.11.3, 2.12.0, 2.12.1, 2.12.2, 2.12.3, 2.13.0, 2.13.1, 2.13.2, 2.13.3, 2.13.4, 2.14.0, 2.15.0, 2.15.1, 2.15.2, 2.15.3, 2.16.0, 3.0.0, 3.0.1, 3.0.2, 3.1.0, 3.1.1, 3.2.0, 3.3.0, 3.4.0, 3.5.0, 3.5.1, 3.5.2, 3.6.0, 3.6.1, 3.6.2, 3.7.0, 3.7.1, 3.8.0, 3.8.1, 3.8.2, 3.9.0, 3.9.1, 3.10.0, 3.11.0, 3.11.1, 3.11.2, 3.11.3, 3.11.4, 3.12.0, 3.12.1, 4.0.0, 4.0.1, 4.1.0, 4.1.1, 4.2.0, 4.2.1, 4.3.0
All unaffected versions: 3.12.2, 3.12.4, 3.12.5, 3.12.6, 4.3.1, 4.3.3, 4.3.4, 4.3.5, 4.3.6, 4.3.7, 4.3.8, 4.3.9, 4.3.10, 4.3.11, 4.3.12, 5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.0.4, 5.1.0, 5.1.1, 5.2.0, 5.2.1, 5.2.2, 5.3.0, 5.3.1, 5.3.2, 5.4.0, 5.5.0, 5.5.1, 5.5.2, 5.6.0, 5.6.1, 5.6.2, 5.6.4, 5.6.5, 5.6.6, 5.6.7, 5.6.8, 6.0.0, 6.0.1, 6.0.2, 6.1.0, 6.1.1, 6.2.0, 6.2.1, 6.2.2, 6.3.0, 6.3.1, 6.4.0, 6.4.1, 6.4.2