CVE-2019-11736 Information

Description

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. brNote: These attacks requires local system access and only affects Windows. Other operating systems are not affected.. This vulnerability affects Firefox 69 and Firefox ESR 68.1.

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html https://bugzilla.mozilla.org/show_bug.cgi?id=1551913 https://bugzilla.mozilla.org/show_bug.cgi?id=1552206 https://www.mozilla.org/security/advisories/mfsa2019-25/ https://www.mozilla.org/security/advisories/mfsa2019-26/

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.0