Bug 2112230 (CVE-2022-34749)

Summary:	CVE-2022-34749 mistune: catastrophic backtracking
Product:	[Other] Security Response	Reporter:	TEJ RATHI <trathi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	amctagga, aoconnor, bniver, dfreiber, drow, flucifre, gmeno, jburrell, lupinix.fedora, mbenjamin, mhackett, pdelbell, python-sig, sostapov, vereddy, vkumar
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	mistune 2.0.3	Doc Type:	If docs needed, set a value
Doc Text:	A regular expression denial of service (ReDoS) flaw was found in the asteris emphasis regular expression implementation in Mistune. By sending specially-crafted regex input, a remote attacker could invoke a catastrophic backtrack, resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-08-30 19:33:00 UTC	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:	2112231, 2255447, 2255448, 2112232
Bug Blocks:	2111156

Description TEJ RATHI 2022-07-29 06:35:00 UTC

In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking.

https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2
https://github.com/lepture/mistune/releases

Comment 1 TEJ RATHI 2022-07-29 06:36:21 UTC

Created python-mistune tracking bugs for this issue:

Affects: epel-all [bug 2112231]
Affects: fedora-all [bug 2112232]

Comment 2 Product Security DevOps Team 2022-08-30 19:32:59 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.