Bug 1642185 (CVE-2018-12395)

Summary:	CVE-2018-12395 Mozilla: WebExtension bypass of domain restrictions through header rewriting
Product:	[Other] Security Response	Reporter:	Doran Moppert <dmoppert>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	cschalle, gecko-bugs-nobody, jhorak, stransky
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:	2018-11-13 06:15:55 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:	1640852, 1640854, 1649195
Bug Blocks:	1640850

Description Doran Moppert 2018-10-23 22:07:48 UTC

By rewriting the `Host` request headers using the `webRequest` API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted.



External Reference:

https://www.mozilla.org/en-US/security/advisories/mfsa2018-27/#CVE-2018-12395

Comment 1 Doran Moppert 2018-10-23 22:07:58 UTC

Acknowledgments:

Name: the Mozilla project
Upstream: Rob Wu, Andrew Swan

Comment 2 errata-xmlrpc 2018-10-24 22:09:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3005 https://access.redhat.com/errata/RHSA-2018:3005

Comment 3 errata-xmlrpc 2018-10-24 22:10:05 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:3006 https://access.redhat.com/errata/RHSA-2018:3006