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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1507
          Mozilla Foundation Security Advisory 2021-19: Security
               Vulnerabilities fixed in Thunderbird 78.10.1
                                5 May 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

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

Reference:         ESB-2021.1506

Original Bulletin: 
   https://www.mozilla.org/en-US/security/advisories/mfsa2021-19/

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Mozilla Foundation Security Advisory 2021-19

Security Vulnerabilities fixed in Thunderbird 78.10.1

Announced: May  4, 2021
Impact:    moderate
Products:  Thunderbird
Fixed in:  Thunderbird 78.10.1

# CVE-2021-29951: Thunderbird Maintenance Service could have been started or
stopped by domain users

Reporter: James Forshaw
Impact:   moderate

Description

The 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.

References

  o Bug 1690062

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