[Security] Bump puma from 4.2.1 to 4.3.1

[dependabot-preview]

Bumps puma from 4.2.1 to 4.3.1. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects puma

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:

... (truncated)

Affected versions: >= 4.0.0, < 4.3.1

Release notes

Sourced from puma's releases.

v4.3.0 - Mysterious Traveller

Mysterious Traveller

• Features

  • Strip whitespace at end of HTTP headers (#2010)
  • Optimize HTTP parser for JRuby (#2012)
  • Add SSL support for the control app and cli (#2046, #2052)

• Bugfixes

  • Fix Errno::EINVAL when SSL is enabled and browser rejects cert (#1564)
  • Fix pumactl defaulting puma to development if an environment was not specified (#2035)
  • Fix closing file stream when reading pid from pidfile (#2048)
  • Fix a typo in configuration option --extra_runtime_dependencies (#2050)

Changelog

Sourced from puma's changelog.

4.3.1 and 3.12.2 / 2019-12-05

• Security
  • Fix: a poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack. CVE-2019-16770.

4.3.0 / 2019-11-07

• Features

  • Strip whitespace at end of HTTP headers (#2010)
  • Optimize HTTP parser for JRuby (#2012)
  • Add SSL support for the control app and cli (#2046, #2052)

• Bugfixes

  • Fix Errno::EINVAL when SSL is enabled and browser rejects cert (#1564)
  • Fix pumactl defaulting puma to development if an environment was not specified (#2035)
  • Fix closing file stream when reading pid from pidfile (#2048)
  • Fix a typo in configuration option --extra_runtime_dependencies (#2050)

Commits

• 2986bc4 4.3.1
• 285c3f9 4.3.1 and 4.2.1 release notes
• 98a1f03 Merge pull request from GHSA-7xx3-m584-x994
• d20242b 4.3.0
• 4852902 Merge pull request #2068 from ahorek/travis_fixes
• 2d89d7c travis fixes
• 3203159 dont set frozen-string-literal for ruby 2.2 [changelog skip] (#2066)
• 8e751a8 Add TruffleRuby to (Travis) CI
• 536c3ed Rubocop failures
• 554c02c Also make request_body_wait_chunked less strict
• Additional commits viewable in compare view

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