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AUSCERT External Security Bulletin Redistribution
ESB-2020.2949
MFSA 2020-41 Vulnerabilities fixed in Thunderbird 78.2
28 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Thunderbird
Publisher: Mozilla
Operating System: Windows
Linux variants
Mac OS
Impact/Access: Increased Privileges -- Existing Account
Execute Arbitrary Code/Commands -- Unknown/Unspecified
Provide Misleading Information -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-15669 CVE-2020-15664 CVE-2020-15663
Reference: ESB-2020.2948
ESB-2020.2913
ESB-2020.2912
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-41/
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Mozilla Foundation Security Advisory 2020-41
Security Vulnerabilities fixed in Thunderbird 78.2
Announced
August 25, 2020
Impact
high
Products
Thunderbird
Fixed in
Thunderbird 78.2
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-2020-15663: Downgrade attack on the Mozilla Maintenance Service could
have resulted in escalation of privilege
Reporter
Xiaoyin Liu
Impact
high
Description
If Thunderbird is installed to a user-writable directory, the Mozilla
Maintenance Service would execute updater.exe from the install location with
system privileges. Although the Mozilla Maintenance Service does ensure that
updater.exe is signed by Mozilla, the version could have been rolled back to a
previous version which would have allowed exploitation of an older bug and
arbitrary code execution with System Privileges.
Note: This issue only affected Windows operating systems. Other operating
systems are unaffected.
References
o Bug 1643199
# CVE-2020-15664: Attacker-induced prompt for extension installation
Reporter
Kaizer Soze
Impact
high
Description
By holding a reference to the eval() function from an about:blank window, a
malicious webpage could have gained access to the InstallTrigger object which
would allow them to prompt the user to install an extension. Combined with user
confusion, this could result in an unintended or malicious extension being
installed.
References
o Bug 1658214
# CVE-2020-15670: Memory safety bugs fixed in Thunderbird 78.2
Reporter
Mozilla developers and community
Impact
high
Description
Mozilla developers Jason Kratzer, Christian Holler, Byron Campen, Tyson Smith
reported memory safety bugs present in Thunderbird 78.1. 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 78.2
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