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AUSCERT External Security Bulletin Redistribution
MFSA 2020-40 Security Vulnerabilities fixed in Thunderbird 68.12
28 August 2020
AusCERT Security Bulletin Summary
Product: Thunderbird 68
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Execute Arbitrary Code/Commands -- Unknown/Unspecified
Provide Misleading Information -- Existing Account
CVE Names: CVE-2020-15669 CVE-2020-15664 CVE-2020-15663
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Mozilla Foundation Security Advisory 2020-40
Security Vulnerabilities fixed in Thunderbird 68.12
August 25, 2020
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
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.
o Bug 1643199
# CVE-2020-15664: Attacker-induced prompt for extension installation
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
o Bug 1658214
# CVE-2020-15669: Use-After-Free when aborting an operation
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
o Bug 1656957
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