Bug 2129735 (CVE-2022-40188)

Summary:	CVE-2022-40188 knot-resolver: CPU-expensive DoS by malicious domains
Product:	[Other] Security Response	Reporter:	TEJ RATHI <trathi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
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:	knot-resolver 5.5.3	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-11-28 02:27:16 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:	2129736, 2129737
Bug Blocks:

Description TEJ RATHI 2022-09-26 08:24:47 UTC

Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of algorithmic complexity. During an attack, an authoritative server must return large NS sets or address sets.

https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1343#note_262558
https://www.knot-resolver.cz/2022-09-21-knot-resolver-5.5.3.html

Comment 1 TEJ RATHI 2022-09-26 08:25:13 UTC

Created knot-resolver tracking bugs for this issue:

Affects: epel-all [bug 2129737]
Affects: fedora-all [bug 2129736]

Comment 2 Jakub Ruzicka 2022-10-03 05:56:34 UTC

5.5.3 packages with fix for this issue already hit stable f35, f36, f37, el7, el8, el9, and rawhide:

https://bodhi.fedoraproject.org/updates/?search=knot-resolver-5.5.3

Comment 3 Product Security DevOps Team 2022-11-28 02:27:14 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.