CVE-2020-15663 Information

Description

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.

CVSS Vector

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

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1643199 https://www.mozilla.org/security/advisories/mfsa2020-36/ https://www.mozilla.org/security/advisories/mfsa2020-37/ https://www.mozilla.org/security/advisories/mfsa2020-38/ https://www.mozilla.org/security/advisories/mfsa2020-40/ https://www.mozilla.org/security/advisories/mfsa2020-41/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8