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             AUSCERT External Security Bulletin Redistribution

            Security Vulnerabilities fixed in Thunderbird 78.8
                             24 February 2021


        AusCERT Security Bulletin Summary

Product:           Mozilla Thunderbird
Publisher:         Mozilla
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Access Confidential Data        -- Remote with User Interaction
                   Reduced Security                -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-23978 CVE-2021-23973 CVE-2021-23969

Reference:         ESB-2021.0675

Original Bulletin: 

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Mozilla Foundation Security Advisory 2021-09

Security Vulnerabilities fixed in Thunderbird 78.8

Announced: February 23, 2021
Impact:    high
Products:  Thunderbird
Fixed in:  Thunderbird 78.8

In general, these flaws cannot be exploited through email in the Thunderbird
product because scripting is disabled when reading mail, but are potentially
risks in browser or browser-like contexts.

# CVE-2021-23969: Content Security Policy violation report could have contained
the destination of a redirect

Reporter: Masato Kinugawa
Impact:   high


As specified in the W3C Content Security Policy draft, when creating a
violation report, "User agents need to ensure that the source file is the URL
requested by the page, pre-redirects. If that's not possible, user agents need
to strip the URL down to an origin to avoid unintentional leakage." Under
certain types of redirects, Thunderbird incorrectly set the source file to be
the destination of the redirects. This was fixed to be the redirect
destination's origin.


  o Bug 1542194

# CVE-2021-23968: Content Security Policy violation report could have contained
the destination of a redirect

Reporter: Ademar Nowasky Junior
Impact:   high


If Content Security Policy blocked frame navigation, the full destination of a
redirect served in the frame was reported in the violation report; as opposed
to the original frame URI. This could be used to leak sensitive information
contained in such URIs.


  o Bug 1687342

# CVE-2021-23973: MediaError message property could have leaked information
about cross-origin resources

Reporter: Andreas Pehrson
Impact:   low


When trying to load a cross-origin resource in an audio/video context a
decoding error may have resulted, and the content of that error may have
revealed information about the resource.


  o Bug 1690976

# CVE-2021-23978: Memory safety bugs fixed in Thunderbird 78.8

Reporter: Mozilla developers
Impact:   high


Mozilla developers Alexis Beingessner, Tyson Smith, Nika Layzell, and Mats
Palmgren reported memory safety bugs present in Thunderbird 78.7. 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.


  o Memory safety bugs fixed in Thunderbird 78.8

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