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AUSCERT External Security Bulletin Redistribution
ESB-2020.4419
Thunderbird: Multiple vulnerabilities
16 December 2020
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AusCERT Security Bulletin Summary
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Product: Thunderbird
Publisher: Mozilla
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-35113 CVE-2020-35112 CVE-2020-35111
CVE-2020-26978 CVE-2020-26974 CVE-2020-26973
CVE-2020-26971 CVE-2020-16042
Reference: ESB-2020.4418
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/
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Mozilla Foundation Security Advisory 2020-56
Security Vulnerabilities fixed in Thunderbird 78.6
Announced: December 15, 2020
Impact: critical
Products: Thunderbird
Fixed in: Thunderbird 78.6
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-2020-16042: Operations on a BigInt could have caused uninitialized memory
to be exposed
Reporter: Andre Bargull
Impact: critical
Description
When a BigInt was right-shifted the backing store was not properly cleared,
allowing uninitialized memory to be read.
References
o Bug 1679003
# CVE-2020-26971: Heap buffer overflow in WebGL
Reporter: Omair, Abraruddin Khan
Impact: high
Description
Certain blit values provided by the user were not properly constrained leading
to a heap buffer overflow on some video drivers.
References
o Bug 1663466
# CVE-2020-26973: CSS Sanitizer performed incorrect sanitization
Reporter: Kai Engert
Impact: high
Description
Certain input to the CSS Sanitizer confused it, resulting in incorrect
components being removed. This could have been used as a sanitizer bypass.
References
o Bug 1680084
# CVE-2020-26974: Incorrect cast of StyleGenericFlexBasis resulted in a heap
use-after-free
Reporter: Pham Bao of VinCSS (Member of Vingroup)
Impact: high
Description
When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object
could have been incorrectly cast to the wrong type. This resulted in a heap
user-after-free, memory corruption, and a potentially exploitable crash.
References
o Bug 1681022
# CVE-2020-26978: Internal network hosts could have been probed by a malicious
webpage
Reporter: Samy Kamkar, Ben Seri, and Gregory Vishnepolsky
Impact: moderate
Description
Using techniques that built on the slipstream research, a malicious webpage
could have exposed both an internal network's hosts as well as services running
on the user's local machine.
References
o Bug 1677047
# CVE-2020-35111: The proxy.onRequest API did not catch view-source URLs
Reporter: Yassine Tioual
Impact: low
Description
When an extension with the proxy permission registered to receive <all_urls>,
the proxy.onRequest callback was not triggered for view-source URLs. While web
content cannot navigate to such URLs, a user opening View Source could have
inadvertently leaked their IP address.
References
o Bug 1657916
# CVE-2020-35112: Opening an extension-less download may have inadvertently
launched an executable instead
Reporter: Samuel Attard via the Chrome Security Team
Impact: low
Description
If a user downloaded a file lacking an extension on Windows, and then "Open"-ed
it from the downloads panel, if there was an executable file in the downloads
directory with the same name but with an executable extension (such as .bat or
.exe) that executable would have been launched instead.
Note: This issue only affected Windows operating systems. Other operating
systems are unaffected.
References
o Bug 1661365
# CVE-2020-35113: Memory safety bugs fixed in Thunderbird 78.6
Reporter: Christian Holler
Impact: high
Description
Mozilla developer Christian Holler reported memory safety bugs present in
Thunderbird 78.5. 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 78.6
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