Bug 1748659 (CVE-2019-11753)

Summary:	CVE-2019-11753 Mozilla: Privilege escalation with Mozilla Maintenance Service in custom Firefox installation location
Product:	[Other] Security Response	Reporter:	Doran Moppert <dmoppert>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	jhorak, security-response-team, stransky
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	firefox 60.9, firefox 68.1	Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-09-04 01:07:20 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:
Bug Blocks:	1745825

Description Doran Moppert 2019-09-04 00:47:34 UTC

The Firefox installer allows Firefox to be installed to a custom user writable location, leaving it unprotected from manipulation by unprivileged users or malware. If the Mozilla Maintenance Service is manipulated to update this unprotected location and the updated maintenance service in the unprotected location has been altered, the altered maintenance service can run with elevated privileges during the update process due to a lack of integrity checks. This allows for privilege escalation if the executable has been replaced locally. 

*Note: This attack requires local system access and only affects Windows. Other operating systems are not affected.*



External Reference:

https://www.mozilla.org/en-US/security/advisories/mfsa2019-27/#CVE-2019-11753

Comment 1 Doran Moppert 2019-09-04 00:47:36 UTC

Acknowledgments:

Name: the Mozilla project
Upstream: Holger Fuhrmannek

Comment 2 Doran Moppert 2019-09-04 00:52:55 UTC

Statement:

This vulnerability only affected Firefox on the Windows operating system.  Firefox on Red Hat Enterprise Linux is not affected.

Comment 3 Product Security DevOps Team 2019-09-04 01:07:20 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-2019-11753