Bug 1980048 (CVE-2021-36377)

Summary:	CVE-2021-36377 fossil: client-side TLS hostname verification bug
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:	dan.cermak, divya.hariomtatsat, petasisg, shngmao
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:	2021-07-07 22:40:20 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:	1980049
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2021-07-07 16:46:08 UTC

It has been discovered that the client-side TLS implementation in Fossil was often failing to verify that the hostname of the server matched the hostname contained in the TLS certificate. Hence, an "https" connection would always work as long as the server returned any valid certificate, even if that certificate did not match the hostname.

Reference:
https://fossil-scm.org/forum/forumpost/8d367e16f53d93c789d70bd3bf2c9587227bbd5c6a7b8e512cccd79007536036

Comment 1 Guilherme de Almeida Suckevicz 2021-07-07 16:46:23 UTC

Created fossil tracking bugs for this issue:

Affects: fedora-all [bug 1980049]

Comment 2 Product Security DevOps Team 2021-07-07 22:40:20 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.