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AUSCERT External Security Bulletin Redistribution
Mozilla Foundation Security Advisory 2021-18S: Security
Vulnerabilities fixed in Firefox ESR 78.10.1
5 May 2021
AusCERT Security Bulletin Summary
Product: Firefox ESR
Operating System: Windows
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2021-29951
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Mozilla Foundation Security Advisory 2021-18
Security Vulnerabilities fixed in Firefox ESR 78.10.1
Announced: May 4, 2021
Products: Firefox ESR
Fixed in: Firefox ESR 78.10.1
# CVE-2021-29951: Mozilla Maintenance Service could have been started or stopped
by domain users
Reporter: James Forshaw
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.
o Bug 1690062
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