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AUSCERT Security Bulletin
ASB-2020.0035
Mozilla Foundation Security Advisory 2020-05
13 February 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mozilla Firefox
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Cross-site Scripting -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-6801 CVE-2020-6800 CVE-2020-6799
CVE-2020-6798 CVE-2020-6797 CVE-2020-6796
Member content until: Friday, March 13 2020
OVERVIEW
Vulnerabilities have been fixed in Mozilla Firefox 73 [1]
IMPACT
Mozilla has given the following information regarding these vulnerabilities:
"Announced
February 11, 2020
Impact
high
Products
Firefox
Fixed in
Firefox 73
# CVE-2020-6796: Missing bounds check on shared memory read in the parent
process
Reporter
Thomas Imbert
Impact
high
Description
A content process could have modified shared memory relating to crash reporting
information, crash itself, and cause an out-of-bound write. This could have
caused memory corruption and a potentially exploitable crash.
References
o Bug 1610426
# CVE-2020-6797: Extensions granted downloads.open permission could open
arbitrary applications on Mac OSX
Reporter
Vladimir Metnew
Impact
moderate
Description
By downloading a file with the .fileloc extension, a semi-privileged extension
could launch an arbitrary application on the user's computer. The attacker is
restricted as they are unable to download non-quarantined files or supply
command line arguments to the application, limiting the impact.
Note: this issue only occurs on Mac OSX. Other operating systems are
unaffected.
References
o Bug 1596668
# CVE-2020-6798: Incorrect parsing of template tag could result in JavaScript
injection
Reporter
terjanq
Impact
moderate
Description
If a <template> tag was used in a <select%gt; tag, the parser could be confused
and allow JavaScript parsing and execution when it should not be allowed. A
site that relied on the browser behaving correctly could suffer a cross-site
scripting vulnerability as a result.
References
o Bug 1602944
# CVE-2020-6799: Arbitrary code execution when opening pdf links from other
applications, when Firefox is configured as default pdf reader
Reporter
Joshua Graham & Brendan Scarvell
Impact
moderate
Description
Command line arguments could have been injected during Firefox invocation as a
shell handler for certain unsupported file types. This required Firefox to be
configured as the default handler for a given file type and for a file
downloaded to be opened in a third party application that insufficiently
sanitized URL data. In that situation, clicking a link in the third party
application could have been used to retrieve and execute files whose location
was supplied through command line arguments.
Note: This issue only affects Windows operating systems and when Firefox is
configured as the default handler for non-default filetypes. Other operating
systems are unaffected.
References
o Bug 1606596
# CVE-2020-6800: Memory safety bugs fixed in Firefox 73 and Firefox ESR 68.5
Reporter
Mozilla developers and community
Impact
high
Description
Mozilla developers and community members Raul Gurzau, Tyson Smith, Bob Clary,
Liz Henry, and Christian Holler reported memory safety bugs present in Firefox
72 and Firefox ESR 68.4. 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 73 and Firefox ESR 68.5
# CVE-2020-6801: Memory safety bugs fixed in Firefox 73
Reporter
Mozilla developers
Impact
high
Description
Mozilla developers Jason Kratzer, Tyson Smith, and Christian Holler reported
memory safety bugs present in Firefox 72. 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 73" [1]
MITIGATION
It is recommended to upgrade Firefox to the latest version.
REFERENCES
[1] Mozilla Foundation Security Advisory 2020-05
https://www.mozilla.org/en-US/security/advisories/mfsa2020-05/
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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