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CVE-2021-29951

Status Candidate

Overview

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.

Related Files

Mozilla Windows Maintenance Service Weak DACL
Posted May 11, 2021
Authored by James Forshaw, Google Security Research

Mozilla's Firefox 85 for Windows has a weak DACL for domain networks.

tags | exploit
systems | windows
advisories | CVE-2021-29951
SHA-256 | 08a69b8cf9242eaeeea1530f769b9003a468a4abf7dde3f7e851a23a5711e542
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