Bug 2048936 (CVE-2021-45951)

Summary:	CVE-2021-45951 dnsmasq: a heap-based buffer overflow in check_bad_address
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bdettelb, code, dbecker, dfreiber, dns-sig, doconnor, dougsland, drow, eglynn, jburrell, jjoyce, jschluet, lhh, lpeer, lsvaty, mburns, mgarciac, pemensik, pgrist, rogbas, sclewis, slinaber, teagle, veillard, vkumar
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:	2022-05-24 23:43:07 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:	2048937
Bug Blocks:	2048923

Description Marian Rehak 2022-02-01 08:34:26 UTC

A heap-based buffer overflow in check_bad_address (called from check_for_bogus_wildcard and FuzzCheckForBogusWildcard).

Reference:

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-924.yaml
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35868

Comment 1 Marian Rehak 2022-02-01 08:34:41 UTC

Created dnsmasq tracking bugs for this issue:

Affects: fedora-all [bug 2048937]