CVE-2022-23634

Published: 11 February 2022

Puma is a Ruby/Rack web server built for parallelism. Prior to `puma` version `5.6.2`, `puma` may not always call `close` on the response body. Rails, prior to version `7.0.2.2`, depended on the response body being closed in order for its `CurrentAttributes` implementation to work correctly. The combination of these two behaviors (Puma not closing the body + Rails' Executor implementation) causes information leakage. This problem is fixed in Puma versions 5.6.2 and 4.3.11. This problem is fixed in Rails versions 7.02.2, 6.1.4.6, 6.0.4.6, and 5.2.6.2. Upgrading to a patched Rails _or_ Puma version fixes the vulnerability.

Notes

Author	Note
alexmurray	focal also appears to be affected but the affected code is in lib/puma/server.rb

Priority

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package	Release	Status
puma Launchpad, Ubuntu, Debian	focal	Released (3.12.4-1ubuntu2+esm1) Available with Ubuntu Pro
	impish	Ignored (end of life)
	jammy	Released (5.5.2-2ubuntu2+esm1) Available with Ubuntu Pro
	kinetic	Ignored (end of life, was needed)
	lunar	Not vulnerable (5.6.5-3ubuntu1)
	mantic	Not vulnerable (5.6.5-3ubuntu1)
	noble	Not vulnerable (5.6.5-3ubuntu1)
	trusty	Ignored (end of standard support)
	upstream	Needs triage
	xenial	Ignored (end of standard support)
	Patches: upstream: https://github.com/puma/puma/commit/b70f451fe8abc0cff192c065d549778452e155bb

Severity score breakdown

Parameter	Value
Base score	5.9
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1005391

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