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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
Publisher:         Mozilla
Operating System:  Windows
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-29951  

Original Bulletin: 

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Mozilla Foundation Security Advisory 2021-18

Security Vulnerabilities fixed in Firefox ESR 78.10.1

Announced: May  4, 2021
Impact:    moderate
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
Impact:   moderate


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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