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AUSCERT Security Bulletin
ASB-2018.0110
Firefox ESR 52.8 contains multiple vulnerabilities
10 May 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mozilla Firefox ESR
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-5183 CVE-2018-5178 CVE-2018-5174
CVE-2018-5168 CVE-2018-5159 CVE-2018-5158
CVE-2018-5157 CVE-2018-5155 CVE-2018-5154
CVE-2018-5150
Member content until: Saturday, June 9 2018
Reference: ASB-2018.0109
OVERVIEW
Multiple vulnerabilities have been identified in Mozilla Firefox ESR
prior to version 52.8. [1]
IMPACT
Mozilla have provided the following details regarding the
vulnerabilities:
"
#CVE-2018-5183: Backport critical security fixes in Skia
Reporter
Mozilla Developers
Impact
critical
Description
Mozilla developers backported selected changes in the Skia library to the ESR52
branch of Firefox. These changes correct memory corruption issues including
invalid buffer reads and writes during graphic operations.
References
* Bug 1454692
#CVE-2018-5154: Use-after-free with SVG animations and clip paths
Reporter
Nils
Impact
high
Description
A use-after-free vulnerability can occur while enumerating attributes during
SVG animations with clip paths. This results in a potentially exploitable
crash.
References
* Bug 1443092
#CVE-2018-5155: Use-after-free with SVG animations and text paths
Reporter
Nils
Impact
high
Description
A use-after-free vulnerability can occur while adjusting layout during SVG
animations with text paths. This results in a potentially exploitable crash.
References
* Bug 1448774
#CVE-2018-5157: Same-origin bypass of PDF Viewer to view protected PDF files
Reporter
Wladimir Palant
Impact
high
Description
Same-origin protections for the PDF viewer can be bypassed, allowing a
malicious site to intercept messages meant for the viewer. This could allow the
site to retrieve PDF files restricted to viewing by an authenticated user on a
third-party website.
References
* Bug 1449898
#CVE-2018-5158: Malicious PDF can inject JavaScript into PDF Viewer
Reporter
Wladimir Palant
Impact
high
Description
The PDF viewer does not sufficiently sanitize PostScript calculator functions,
allowing malicious JavaScript to be injected through a crafted PDF file. This
JavaScript can then be run with the permissions of the PDF viewer by its
worker.
References
* Bug 1452075
#CVE-2018-5159: Integer overflow and out-of-bounds write in Skia
Reporter
Ivan Fratric
Impact
high
Description
An integer overflow can occur in the Skia library due to 32-bit integer use in
an array without integer overflow checks, resulting in possible out-of-bounds
writes. This could lead to a potentially exploitable crash triggerable by web
content.
References
* Bug 1441941
#CVE-2018-5168: Lightweight themes can be installed without user interaction
Reporter
Wladimir Palant
Impact
moderate
Description
Sites can bypass security checks on permissions to install lightweight themes
by manipulating the baseURI property of the theme element. This could allow a
malicious site to install a theme without user interaction which could contain
offensive or embarrassing images.
References
* Bug 1449548
#CVE-2018-5174: Windows Defender SmartScreen UI runs with less secure behavior
for downloaded files in Windows 10 April 2018 Update
Reporter
Jimmy
Impact
moderate
Description
In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the
SEE_MASK_FLAG_NO_UI flag associated with downloaded files and will not show any
UI. Files that are unknown and potentially dangerous will be allowed to run
because SmartScreen will not prompt the user for a decision, and if the user is
offline all files will be allowed to be opened because Windows won?t prompt the
user to ask what to do. Firefox incorrectly sets this flag when downloading
files, leading to less secure behavior from SmartScreen.
Note: this issue only affects Windows 10 users running the April 2018 update or
later. It does not affect other Windows users or other operating systems.
References
* Bug 1447080
#CVE-2018-5178: Buffer overflow during UTF-8 to Unicode string conversion
through legacy extension
Reporter
Root Object
Impact
moderate
Description
A buffer overflow was found during UTF8 to Unicode string conversion within
JavaScript with extremely large amounts of data. This vulnerability requires
the use of a malicious or vulnerable legacy extension in order to occur.
References
* Bug 1443891
#CVE-2018-5150: Memory safety bugs fixed in Firefox 60 and Firefox ESR 52.8
Reporter
Mozilla developers and community
Impact
critical
Description
Mozilla developers and community members Christoph Diehl, Randell Jesup, Tyson
Smith, Alex Gaynor, Ronald Crane, Julian Hector, Kannan Vijayan, and Jason
Kratzer reported memory safety bugs present in Firefox 59 and Firefox ESR 52.7.
Some of these bugs showed evidence of memory corruption and we presume that
with enough effort that some of these could be exploited to run arbitrary code.
" [1]
MITIGATION
Users are advised to update to Firefox ESR version 52.8 to address
these issues. [1]
REFERENCES
[1] Mozilla Foundation Security Advisory 2018-12
https://www.mozilla.org/en-US/security/advisories/mfsa2018-12/
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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