Bug 1840280 (CVE-2020-10995)

Summary:	CVE-2020-10995 pdns-recursor: issue in DNS protocol allows malicious parties to use recursive DNS services to attack third party authoritative name servers
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ruben, sander
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:	2020-05-26 23:20:30 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:	1840281, 1840282
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2020-05-26 16:54:34 UTC

PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks. An issue in the DNS protocol has been found that allow malicious parties to use recursive DNS services to attack third party authoritative name servers. The attack uses a crafted reply by an authoritative name server to amplify the resulting traffic between the recursive and other authoritative name servers. Both types of service can suffer degraded performance as an effect. This is triggered by random subdomains in the NSDNAME in NS records. PowerDNS Recursor 4.1.16, 4.2.2 and 4.3.1 contain a mitigation to limit the impact of this DNS protocol issue.

Reference:
https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-01.html

Comment 1 Guilherme de Almeida Suckevicz 2020-05-26 16:55:28 UTC

Created pdns-recursor tracking bugs for this issue:

Affects: epel-all [bug 1840281]
Affects: fedora-all [bug 1840282]

Comment 2 Product Security DevOps Team 2020-05-26 23:20:30 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.