Bug 2221255 (CVE-2023-31606)

Summary:	CVE-2023-31606 RedCloth: Regular expression denial of service in sanitize_html function
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	amasferr, mkudlej, 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:	The HTML sanitizer function in Rubygems' Redcloth incorrectly handles regular expression inputs. This issue could allow an attacker to send a malicious regexp to the server and cause 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:	2221257, 2221256
Bug Blocks:	2221258

Description Pedro Sampaio 2023-07-07 16:48:12 UTC

A Regular Expression Denial of Service (ReDoS) issue was discovered in the sanitize_html function of redcloth gem v4.0.0. This vulnerability allows attackers to cause a Denial of Service (DoS) via supplying a crafted payload.

References:

https://github.com/jgarber/redcloth
https://github.com/e23e/CVE-2023-31606#readme
https://github.com/jgarber/redcloth/issues/73
https://lists.debian.org/debian-lts-announce/2023/07/msg00002.html

Comment 1 Pedro Sampaio 2023-07-07 16:48:33 UTC

Created rubygem-RedCloth tracking bugs for this issue:

Affects: epel-all [bug 2221257]
Affects: fedora-all [bug 2221256]