CVE-2021-29951 Information

Description

The Mozilla Maintenance Service granted SERVICE_START access to BUILTIN|Users which in a domain network grants normal remote users access to start or stop the service. This could be used to prevent the browser update service from operating (if an attacker spammed the ‘Stop’ command); but also exposed attack surface in the maintenance service. Note: This issue only affected Windows operating systems older than Win 10 build 1709. Other operating systems are unaffected.. This vulnerability affects Thunderbird < 78.10.1 Firefox < 87 and Firefox ESR < 78.10.1.

CVSS Vector

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

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1690062 https://www.mozilla.org/security/advisories/mfsa2021-10/ https://www.mozilla.org/security/advisories/mfsa2021-19/ https://www.mozilla.org/security/advisories/mfsa2021-18/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.5