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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2999
        MFSA 2021-41 Security Vulnerabilities fixed in Thunderbird
                             8 September 2021

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

Product:           Thunderbird
Publisher:         Mozilla
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Reduced Security                -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-38495 CVE-2021-38492 

Original Bulletin: 
   https://www.mozilla.org/en-US/security/advisories/mfsa2021-41/
   https://www.mozilla.org/en-US/security/advisories/mfsa2021-42/

Comment: This bulletin contains two (2) Mozilla security advisories.

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Mozilla Foundation Security Advisory 2021-41

Security Vulnerabilities fixed in Thunderbird 91.1

Announced: September  7, 2021
Impact:    low
Products:  Firefox ESR
Fixed in:  Firefox ESR 91.1

# CVE-2021-38492: Navigating to `mk:` URL scheme could load Internet Explorer

Reporter: James Lee
Impact:   moderate

Description

When delegating navigations to the operating system, Thunderbird would accept
the mk scheme which might allow attackers to launch pages and execute scripts
in Internet Explorer in unprivileged mode.
This bug only affects Thunderbird for Windows. Other operating systems are
unaffected.

References

  o Bug 1721107

# CVE-2021-38495: Memory safety bugs fixed in Thunderbird 91.1

Reporter: Mozilla developers and community
Impact:   high

Description

Mozilla developers Tyson Smith, Christian Holler, and Gabriele Svelto reported
memory safety bugs present in Thunderbird 78.13.0. Some of these bugs showed
evidence of memory corruption and we presume that with enough effort some of
these could have been exploited to run arbitrary code.

References

  o Memory safety bugs fixed in Thunderbird 91.1

- -----------------------------------------------------------------------------

Mozilla Foundation Security Advisory 2021-42

Security Vulnerabilities fixed in Thunderbird 78.14

Announced: September  7, 2021
Impact:    moderate
Products:  Thunderbird
Fixed in:  Thunderbird 78.14

# CVE-2021-38492: Navigating to `mk:` URL scheme could load Internet Explorer

Reporter: James Lee
Impact:   moderate

Description

When delegating navigations to the operating system, Thunderbird would accept
the mk scheme which might allow attackers to launch pages and execute scripts
in Internet Explorer in unprivileged mode.
This bug only affects Thunderbird for Windows. Other operating systems are
unaffected.

References

  o Bug 1721107

# CVE-2021-38493: Memory safety bugs fixed in Thunderbird 78.14 and Thunderbird
91.1

Reporter: Mozilla developers and community
Impact:   high

Description

Mozilla developers Tyson Smith and Gabriele Svelto reported memory safety bugs
present in Thunderbird 78.13. Some of these bugs showed evidence of memory
corruption and we presume that with enough effort some of these could have been
exploited to run arbitrary code.

References

  o Memory safety bugs fixed in Thunderbird 78.14 and Thunderbird 91.1

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