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                             CERT-Renater

                 Note d'Information No. 2020/VULN561
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DATE                : 08/10/2020

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Mozilla Thunderbird versions prior
                                             to 78.3.

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https://www.mozilla.org/en-US/security/advisories/mfsa2020-44/
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Mozilla Foundation Security Advisory 2020-44
Security Vulnerabilities fixed in Thunderbird 78.3

Announced        September 22, 2020
Impact           moderate
Products         hunderbird
Fixed in
        Thunderbird 78.3

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-2020-15677: Download origin spoofing via redirect

Reporter         Richard Thomas and Tom Chothia of University of
                     Birmingham
Impact           moderate

Description

By exploiting an Open Redirect vulnerability on a website, an attacker
could have spoofed the site displayed in the download file dialog to
show the original site (the one suffering from the open redirect) rather
than the site the file was actually downloaded from.

References

    Bug 1641487


#CVE-2020-15676: XSS when pasting attacker-controlled data into a
contenteditable element

Reporter          Daniel Fröjdendahl
Impact            moderate

Description

Thunderbird sometimes ran the onload handler for SVG elements that the
DOM sanitizer decided to remove, resulting in JavaScript being executed
after pasting attacker-controlled data into a contenteditable element.

References

    Bug 1646140


#CVE-2020-15678: When recursing through layers while scrolling, an
iterator may have become invalid, resulting in a potential use-after-
free scenario

Reporter         Lukas Bernhard
Impact           moderate

Description

When recursing through graphical layers while scrolling, an iterator may
have become invalid, resulting in a potential use-after-free. This
occurs because the function
APZCTreeManager::ComputeClippedCompositionBounds did not follow iterator
invalidation rules.

References

    Bug 1660211


#CVE-2020-15673: Memory safety bugs fixed in Thunderbird 78.3

Reporter        Jason Kratzer
Impact          high

Description

Mozilla developer Jason Kratzer reported memory safety bugs present in
Thunderbird 78.2. 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 78.3



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+ 75013 Paris        |    email:cert@support.renater.fr +
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