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                             CERT-Renater

                 Note d'Information No. 2021/VULN115
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DATE                : 23/02/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S):  Systems running Thunderbird versions prior to
                                           78.8.

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https://www.mozilla.org/en-US/security/advisories/mfsa2021-09/
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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

Description

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.


References

    Bug 1542194


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

Reporter            Ademar Nowasky Junior
Impact              high

Description

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.


References

    Bug 1687342


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

Reporter             Andreas Pehrson
Impact               low

Description

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.


References

    Bug 1690976


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

Reporter              Mozilla developers
Impact                high

Description

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.


References

    Memory safety bugs fixed in Thunderbird 78.8



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