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CVE-2020-15663

Published: 1 October 2020

If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, and Firefox ESR < 78.2.

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(windows only)
focal Not vulnerable
(windows only)
groovy Not vulnerable
(windows only)
trusty Does not exist

upstream
Released (80)
xenial Not vulnerable
(windows only)
thunderbird
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(Windows only)
focal Not vulnerable
(Windows only)
groovy Not vulnerable
(Windows only)
trusty Does not exist

upstream
Released (68.11)
xenial Not vulnerable
(Windows only)

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H