[Security] Bump puma from 4.3.5 to 4.3.8

[dependabot-preview]

Bumps puma from 4.3.5 to 4.3.8. This update includes a security fix.

Vulnerabilities fixed

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: <= 4.3.7

Release notes

Sourced from puma's releases.

v4.3.8

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

v4.3.6

puma/puma@v4.3.5...4.3.6

A quick fix for a build error on Mac OS and a JSON require fix for those using phased restart.

• Explicitly include ctype.h to fix compilation warning and build error on macOS with Xcode 12 (#2304)
• Don't require json at boot (#2269)

Changelog

Sourced from puma's changelog.

4.3.8 / 2021-05-11

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

4.3.7 / 2020-11-30

• Bugfixes
  • Backport set CONTENT_LENGTH for chunked requests (Originally: #2287, backport: #2496)

4.3.6 / 2020-09-05

• Bugfixes
  • Explicitly include ctype.h to fix compilation warning and build error on macOS with Xcode 12 (#2304)
  • Don't require json at boot (#2269)

Commits

• b911c13 4.3.8 release note
• 09bb777 Bump version constant
• 8088950 Close keepalive connections after MAX_FAST_INLINE requests
• f3c95af 4.3.7
• 77a90ec Backport set CONTENT_LENGTH for chunked requests (#2496)
• a418e5c Updates to 4.3.6 to pass CI, adds Ubuntu 20.04 [changelog skip] (#2380)
• 3e3647a v4.3.6
• 73cfdf5 Merge pull request #2314 from venables/fix-include
• fa54f4d Merge pull request #2269 from MSP-Greg/json-require
• See full diff in compare view

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