Bug 2178948 (CVE-2023-28450)

Summary:	CVE-2023-28450 dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bdettelb, dfreiber, eglynn, jburrell, jjoyce, lhh, mburns, mgarciac, pemensik, rogbas, spower, 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:	A flaw was found in Dnsmasq. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2180293, 2180294, 2178954
Bug Blocks:	2178946

Description Marian Rehak 2023-03-16 09:13:07 UTC

An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.

Reference:

https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blob;f=CHANGELOG
https://capec.mitre.org/data/definitions/495.html
https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=eb92fb32b746f2104b0f370b5b295bb8dd4bd5e5
https://thekelleys.org.uk/dnsmasq/doc.html

Comment 1 Sandipan Roy 2023-03-16 09:32:40 UTC

Created dnsmasq tracking bugs for this issue:

Affects: fedora-all [bug 2178954]