Bug 1748662 (CVE-2019-11736) - CVE-2019-11736 Mozilla: File manipulation and privilege escalation in Mozilla Maintenance Service
Summary: CVE-2019-11736 Mozilla: File manipulation and privilege escalation in Mozilla...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-11736
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1745825
TreeView+ depends on / blocked
 
Reported: 2019-09-04 00:48 UTC by Doran Moppert
Modified: 2021-02-16 21:25 UTC (History)
3 users (show)

Fixed In Version: firefox 68.1
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-09-04 01:07:22 UTC


Attachments (Terms of Use)

Description Doran Moppert 2019-09-04 00:48:22 UTC
The Mozilla Maintenance Service does not guard against files being hardlinked to another file in the `updates` directory, allowing for the replacement of local files, including the Maintenance Service executable, which is run with privileged access. Additionally, there was a race condition during checks for junctions and symbolic links by the Maintenance Service, allowing for potential local file and directory manipulation to be undetected in some circumstances. This allows for potential privilege escalation by a user with unprivileged local access. 

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



External Reference:

https://www.mozilla.org/en-US/security/advisories/mfsa2019-26/#CVE-2019-11736

Comment 1 Doran Moppert 2019-09-04 00:48:25 UTC
Acknowledgments:

Name: the Mozilla project
Upstream: Seb Patane

Comment 2 Doran Moppert 2019-09-04 00:53:01 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 01:07:22 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-2019-11736


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