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AUSCERT External Security Bulletin Redistribution
ESB-2020.3290
MFSA 2020-44 Security Vulnerabilities fixed in Thunderbird 78.3
25 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Thunderbird
Publisher: Mozilla
Operating System: Windows
Linux variants
Mac OS
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-15678 CVE-2020-15677 CVE-2020-15676
CVE-2020-15673
Reference: ESB-2020.3287
ESB-2020.3246
ESB-2020.3245
Original Bulletin:
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
Thunderbird
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
o Bug 1641487
# CVE-2020-15676: XSS when pasting attacker-controlled data into a
contenteditable element
Reporter
Daniel Frojdendahl
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
o 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
o 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
o Memory safety bugs fixed in Thunderbird 78.3
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