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AUSCERT External Security Bulletin Redistribution
ESB-2020.2948
MFSA 2020-40 Security Vulnerabilities fixed in Thunderbird 68.12
28 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Thunderbird 68
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-2020.2913
ESB-2020.2912
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-40/
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Mozilla Foundation Security Advisory 2020-40
Security Vulnerabilities fixed in Thunderbird 68.12
Announced
August 25, 2020
Impact
high
Products
Thunderbird
Fixed in
Thunderbird 68.12
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-2020-15669: Use-After-Free when aborting an operation
Reporter
Jason Kratzer
Impact
high
Description
When aborting an operation, such as a fetch, an abort signal may be deleted
while alerting the objects to be notified. This results in a use-after-free and
we presume that with enough effort it could have been exploited to run
arbitrary code.
References
o Bug 1656957
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