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AUSCERT External Security Bulletin Redistribution
ESB-2020.2913
MFSA 2020-37 and 38: Security Vulnerabilities fixed in
Firefox ESR 68.12 and 78.2
26 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Firefox ESR 68.12
Firefox ESR 78.2
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-2020-15670 CVE-2020-15669 CVE-2020-15664
CVE-2020-15663
Reference: ESB-2020.2912
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-37/
https://www.mozilla.org/en-US/security/advisories/mfsa2020-38/
Comment: This bulletin contains two (2) Mozilla security advisories.
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Mozilla Foundation Security Advisory 2020-37
Security Vulnerabilities fixed in Firefox ESR 68.12
Announced
August 25, 2020
Impact
high
Products
Firefox ESR
Fixed in
Firefox ESR 68.12
# CVE-2020-15663: Downgrade attack on the Mozilla Maintenance Service could
have resulted in escalation of privilege
Reporter
Xiaoyin Liu
Impact
high
Description
If Firefox 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
- --------------------------------------------------------------------------------
Mozilla Foundation Security Advisory 2020-38
Security Vulnerabilities fixed in Firefox ESR 78.2
Announced
August 25, 2020
Impact
high
Products
Firefox ESR
Fixed in
Firefox ESR 78.2
# CVE-2020-15663: Downgrade attack on the Mozilla Maintenance Service could
have resulted in escalation of privilege
Reporter
Xiaoyin Liu
Impact
high
Description
If Firefox 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 Firefox 80 and Firefox ESR 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 Firefox 79 and Firefox ESR 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 Firefox 80 and Firefox ESR 78.2
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