Bug 1510570 (CVE-2017-15107)

Summary:	CVE-2017-15107 dnsmasq: Improper validation of wildcard synthesized NSEC records
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	apevec, chrisw, code, dougsland, dustymabe, itamar, jima, jjoyce, jschluet, kbasil, laine, lhh, lpeer, markmc, mburns, p, pemensik, rbryant, sclewis, security-response-team, slinaber, srevivo, tdecacqu, thozza, veillard
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in Dnsmasq's implementation of DNSSEC. Wildcard synthesized NSEC records could be improperly interpreted to prove the non-existence of hostnames that actually exist.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-01-22 01:44:13 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:	1536903
Bug Blocks:	1507052

Description Adam Mariš 2017-11-07 16:59:10 UTC

A vulnerability in DNSSEC implementation of Dnsmasq was found. Processing of wildcard synthesized NSEC records may result in improper validation for non-existance in some implementations of DNSSEC. While synthesis of NSEC records is allowed by RFC4592, the synthesized owner names should not be used in the NSEC processing.

Comment 1 Adam Mariš 2017-11-07 16:59:13 UTC

Acknowledgments:

Name: Ralph Dolmans (NLnet Labs), Karst Koymans (University of Amsterdam)

Comment 2 Doran Moppert 2018-01-22 01:40:56 UTC

External References:

http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2018q1/011896.html
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=4fe6744a220eddd3f1749b40cac3dfc510787de6

Comment 3 Doran Moppert 2018-01-22 01:41:40 UTC

Statement:

Versions of Dnsmasq shipped with Red Hat Enterprise Linux are built without DNSSEC support, so they are not affected by this issue.

Comment 4 Doran Moppert 2018-01-22 01:42:49 UTC

Created dnsmasq tracking bugs for this issue:

Affects: fedora-all [bug 1536903]