[Security] Bump puma from 5.2.2 to 5.3.1

[dependabot-preview]

Bumps puma from 5.2.2 to 5.3.1.

Release notes

Sourced from puma's releases.

5.3.0 - Sweetnighter

5.3.0 / 2021-05-07

Contributor @​MSP-Greg codenamed this release "Sweetnighter".

• Features

  • Add support for Linux's abstract sockets (#2564, #2526)
  • Add debug to worker timeout and startup (#2559, #2528)
  • Print warning when running one-worker cluster (#2565, #2534)
  • Don't close systemd activated socket on pumactl restart (#2563, #2504)

• Bugfixes

  • systemd - fix event firing (#2591, #2572)
  • Immediately unlink temporary files (#2613)
  • Improve parsing of HTTP_HOST header (#2605, #2584)
  • Handle fatal error that has no backtrace (#2607, #2552)
  • Fix timing out requests too early (#2606, #2574)
  • Handle segfault in Ruby 2.6.6 on thread-locals (#2567, #2566)
  • Server#closed_socket? - parameter may be a MiniSSL::Socket (#2596)
  • Define UNPACK_TCP_STATE_FROM_TCP_INFO in the right place (#2588, #2556)
  • request.rb - fix chunked assembly for ascii incompatible encodings, add test (#2585, #2583)

• Performance

  • Reset peerip only if remote_addr_header is set (#2609)
  • Reduce puma_parser struct size (#2590)

• Refactor

  • Refactor drain on shutdown (#2600)
  • Micro optimisations in wait_for_less_busy_worker feature (#2579)
  • Lots of test fixes

Changelog

Sourced from puma's changelog.

5.3.1 / 2021-05-11

• Security
  • Close keepalive connections after the maximum number of fast inlined requests (#2625)

5.3.0 / 2021-05-07

• Features

  • Add support for Linux's abstract sockets (#2564, #2526)
  • Add debug to worker timeout and startup (#2559, #2528)
  • Print warning when running one-worker cluster (#2565, #2534)
  • Don't close systemd activated socket on pumactl restart (#2563, #2504)

• Bugfixes

  • systemd - fix event firing (#2591, #2572)
  • Immediately unlink temporary files (#2613)
  • Improve parsing of HTTP_HOST header (#2605, #2584)
  • Handle fatal error that has no backtrace (#2607, #2552)
  • Fix timing out requests too early (#2606, #2574)
  • Handle segfault in Ruby 2.6.6 on thread-locals (#2567, #2566)
  • Server#closed_socket? - parameter may be a MiniSSL::Socket (#2596)
  • Define UNPACK_TCP_STATE_FROM_TCP_INFO in the right place (#2588, #2556)
  • request.rb - fix chunked assembly for ascii incompatible encodings, add test (#2585, #2583)

• Performance

  • Reset peerip only if remote_addr_header is set (#2609)
  • Reduce puma_parser struct size (#2590)

• Refactor

  • Refactor drain on shutdown (#2600)
  • Micro optimisations in wait_for_less_busy_worker feature (#2579)
  • Lots of test fixes

Commits

• 1c91a4f 5.3.1
• 6b4a68a 4.3.8 release note
• df72887 Close keepalive connections after MAX_FAST_INLINE requests
• 6dfb8bc 5.3.0 history (#2622)
• fb71323 Ignore DS_Store
• f7a2d4e systemd - fix event firing (#2591)
• 2654f02 Bump version to 5.3.0 [ci skip] (#2616)
• cc1768e Few documentations fixes. [ci skip] [changelog skip] (#2619)
• ff17194 Refactor drain on shutdown (#2600)
• 3e80f7c fix some spell errors (#2615)
• Additional commits viewable in compare view

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[dependabot-preview]

We've just been alerted that this update fixes a security vulnerability:

Sourced from The GitHub Security Advisory Database.

Keepalive Connections Causing Denial Of Service in puma

This vulnerability is related to CVE-2019-16770.

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).

The fix is very small. A git patch is available here for those using unsupported versions of Puma.

For more information

... (truncated)

Affected versions: [">= 5.0.0, <= 5.3.0"]