Bug 2041806 (CVE-2021-40083)

Summary:	CVE-2021-40083 knot-resolver: remote attacker can cause assertion failure
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dns-sig, jakub.ruzicka, jv+fedora, nicki, pspacek
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-01-18 11:01:38 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:	2041807, 2041808
Bug Blocks:

Description Dhananjay Arunesh 2022-01-18 10:24:24 UTC

Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case (NSEC3 with too many iterations used for a positive wildcard proof).

References:
https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169

Comment 1 Dhananjay Arunesh 2022-01-18 10:24:57 UTC

Created knot-resolver tracking bugs for this issue:

Affects: epel-all [bug 2041808]
Affects: fedora-all [bug 2041807]

Comment 2 Product Security DevOps Team 2022-01-18 11:01:37 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.