Bug 1831718 (CVE-2018-21246)

Summary:	CVE-2018-21246 caddy: Does not have tls StrictHostMatching mode enabled which could result in client auth bypass
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	carl, go-sig, gparvin, jramanat, jweiser, stcannon, tfister, thee
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	caddy 0.10.13	Doc Type:	If docs needed, set a value
Doc Text:	When Caddy is configured to protect a resource with TLS Client Certificate Authentication, but the resource is served by QUIC, client certificates would not be validated and the protected resource would be served to unauthenticated visitors. This vulnerability was due to failing to carefully enable the StrictHostMatching flag, and applies specifically to configurations using Client Certificates and QUIC.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-07-06 07:27:36 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:	1831719, 1831721, 1837819
Bug Blocks:	1831723

Description Michael Kaplan 2020-05-05 14:21:27 UTC

An issue was found in caddy, in versions before 0.10.13, tls: StrictHostMatching mode is not enabled which could result in client auth bypass.

Comment 1 Michael Kaplan 2020-05-05 14:21:49 UTC

Created caddy tracking bugs for this issue:

Affects: epel-7 [bug 1831721]
Affects: fedora-all [bug 1831719]

Comment 2 Michael Kaplan 2020-05-05 14:22:27 UTC

Upstream Changelog:

https://github.com/caddyserver/caddy/releases/tag/v0.10.13

Comment 3 Carl George 🤠 2020-05-06 05:54:26 UTC

This hasn't been an issue in Fedora or EPEL packages in 2 years.  See the respective tracking bugs for more details.

Comment 6 Michael Kaplan 2020-06-18 13:04:08 UTC

References:

https://bugs.gentoo.org/715214

Comment 7 Doran Moppert 2020-07-06 07:06:55 UTC

Upsteam ticket:

https://github.com/caddyserver/caddy/issues/2095

Comment 8 Product Security DevOps Team 2020-07-06 07:27:36 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2018-21246