Bug 2319033 (CVE-2024-47889)

Summary:	CVE-2024-47889 rubygem-actionmailer: Possible ReDoS vulnerability in block_format in Action Mailer
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	akostadi, amasferr, cbartlet, chazlett, dmayorov, ehelms, ggainey, jalviso, jlledo, juwatts, mhulan, mjaros, mkudlej, mmakovy, nmoumoul, pcreech, rchan, smallamp, tjochec
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the rubygem actionmailer. Carefully crafted text can cause the block_format helper to take an unexpected amount of time, possibly resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2319062, 2319063
Bug Blocks:

Description OSIDB Bzimport 2024-10-16 01:01:37 UTC

There is a possible ReDoS vulnerability in the block_format helper in Action Mailer. This vulnerability has been assigned the CVE identifier CVE-2024-47889.

Impact
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Carefully crafted text can cause the block_format helper to take an unexpected amount of time, possibly resulting in a DoS vulnerability. All users running an affected release should either upgrade or apply the relevant patch immediately.

Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected. Rails 8.0.0.beta1 requires Ruby 3.2 or greater so is unaffected.


Releases
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The fixed releases are available at the normal locations.

Workarounds
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Users can avoid calling the `block_format` helper or upgrade to Ruby 3.2

Credits
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Thanks to [ooooooo_q](https://hackerone.com/ooooooo_q) for the report!