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AUSCERT External Security Bulletin Redistribution
ESB-2020.2912
MFSA 2020-36: Security Vulnerabilities fixed in Firefox 80
26 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Firefox
Publisher: Mozilla
Operating System: Windows
Linux variants
Mac OS
Impact/Access: Increased Privileges -- Existing Account
Access Privileged Data -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Execute Arbitrary Code/Commands -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2020-15670 CVE-2020-15668 CVE-2020-15667
CVE-2020-15666 CVE-2020-15665 CVE-2020-15664
CVE-2020-15663 CVE-2020-12401 CVE-2020-12400
CVE-2020-6829
Reference: ESB-2020.2742
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-36/
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Mozilla Foundation Security Advisory 2020-36
Security Vulnerabilities fixed in Firefox 80
Announced: August 25, 2020
Impact: high
Products: Firefox
Fixed in: Firefox 80
# 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 administrative
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-2020-12401: Timing-attack on ECDSA signature generation
Reporter
Sohaib ul Hassan, Iaroslav Gridin, Ignacio M. Delgado-Lozano, Cesar Pereida
Garcia, Jesus-Javier Chi-Dominguez, Alejandro Cabrera Aldaya, and Billy Bob
Brumley, Network and Information Security (NISEC) Group, Tampere
University, Finland
Impact
moderate
Description
During ECDSA signature generation, padding applied in the nonce designed to
ensure constant-time scalar multiplication was removed, resulting in
variable-time execution dependent on secret data.
References
o Bug 1631573
# CVE-2020-6829: P-384 and P-521 vulnerable to an electro-magnetic side channel
attack on signature generation
Reporter
Sohaib ul Hassan, Iaroslav Gridin, Ignacio M. Delgado-Lozano, Cesar Pereida
Garcia, Jesus-Javier Chi-Dominguez, Alejandro Cabrera Aldaya, and Billy Bob
Brumley, Network and Information Security (NISEC) Group, Tampere
University, Finland
Impact
moderate
Description
When performing EC scalar point multiplication, the wNAF point multiplication
algorithm was used; which leaked partial information about the nonce used
during signature generation. Given an electro-magnetic trace of a few signature
generations, the private key could have been computed.
References
o Bug 1631583
# CVE-2020-12400: P-384 and P-521 vulnerable to a side channel attack on
modular inversion
Reporter
Sohaib ul Hassan, Iaroslav Gridin, Ignacio M. Delgado-Lozano, Cesar Pereida
Garcia, Jesus-Javier Chi-Dominguez, Alejandro Cabrera Aldaya, and Billy Bob
Brumley, Network and Information Security (NISEC) Group, Tampere
University, Finland
Impact
moderate
Description
When converting coordinates from projective to affine, the modular inversion
was not performed in constant time, resulting in a possible timing-based side
channel attack.
References
o Bug 1623116
# CVE-2020-15665: Address bar not reset when choosing to stay on a page after
the beforeunload dialog is shown
Reporter
Luan Herrera
Impact
moderate
Description
Firefox did not reset the address bar after the beforeunload dialog was shown
if the user chose to remain on the page. This could have resulted in an
incorrect URL being shown when used in conjunction with other unexpected
browser behaviors.
References
o Bug 1651636
# CVE-2020-15666: MediaError message property leaks cross-origin response
status
Reporter
Gunes Acar
Impact
low
Description
When trying to load a non-video in an audio/video context the exact status code
(200, 302, 404, 500, 412, 403, etc.) was disclosed via the MediaError Message.
This level of information leakage is inconsistent with the standardized onerror
/onsuccess disclosure and can lead to inferring login status to services or
device discovery on a local network among other attacks.
References
o Bug 1450853
# CVE-2020-15667: Heap overflow when processing an update file
Reporter
crixer
Impact
low
Description
When processing a MAR update file, after the signature has been validated, an
invalid name length could result in a heap overflow, leading to memory
corruption and potentially arbitrary code execution. Within Firefox as released
by Mozilla, this issue is only exploitable with the Mozilla-controlled signing
key.
References
o Bug 1653371
# CVE-2020-15668: Data Race when reading certificate information
Reporter
Tyson Smith
Impact
low
Description
A lock was missing when accessing a data structure and importing certificate
information into the trust database.
References
o Bug 1651520
# CVE-2020-15670: Memory safety bugs fixed in Firefox 80 and Firefox ESR 78.2
Reporter
Mozilla developers
Impact
high
Description
Mozilla developers Jason Kratzer, Christian Holler, Byron Campen, and 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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