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AUSCERT Security Bulletin
ASB-2018.0109
Firefox 60 contains multiple vulnerabilities
10 May 2018
===========================================================================
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
Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-5182 CVE-2018-5181 CVE-2018-5180
CVE-2018-5177 CVE-2018-5176 CVE-2018-5175
CVE-2018-5174 CVE-2018-5173 CVE-2018-5172
CVE-2018-5169 CVE-2018-5168 CVE-2018-5167
CVE-2018-5166 CVE-2018-5165 CVE-2018-5164
CVE-2018-5163 CVE-2018-5160 CVE-2018-5159
CVE-2018-5158 CVE-2018-5157 CVE-2018-5155
CVE-2018-5154 CVE-2018-5153 CVE-2018-5152
CVE-2018-5151 CVE-2018-5150
Member content until: Saturday, June 9 2018
OVERVIEW
Multiple vulnerabilities have been identified in Mozilla Firefox prior
to version 60. [1]
IMPACT
The vendor has provided the following information about the
vulnerabilities:
"#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-2018-5160: Uninitialized memory use by WebRTC encoder
Reporter
Andreas Perhson
Impact
high
Description
WebRTC can use a WrappedI420Buffer pixel buffer but the owning image object can
be freed while it is still in use. This can result in the WebRTC encoder using
uninitialized memory, leading to a potentially exploitable crash.
References
* Bug 1436117
#CVE-2018-5152: WebExtensions information leak through webRequest API
Reporter
Andy McKay
Impact
moderate
Description
WebExtensions with the appropriate permissions can attach content scripts to
Mozilla sites such as accounts.firefox.com and listen to network traffic to the
site through the webRequest API. For example, this allows for the interception
of username and an encrypted password during login to Firefox Accounts. This
issue does not expose synchronization traffic directly and is limited to the
process of user login to the website and the data displayed to the user once
logged in.
References
* Bug 1415644
* Bug 1427289
#CVE-2018-5153: Out-of-bounds read in mixed content websocket messages
Reporter
Dennis Fuchs
Impact
moderate
Description
If websocket data is sent with mixed text and binary in a single message, the
binary data can be corrupted. This can result in an out-of-bounds read with the
read memory sent to the originating server in response.
References
* Bug 1436809
#CVE-2018-5163: Replacing cached data in JavaScript Start-up Bytecode Cache
Reporter
Nicolas B. Pierron
Impact
moderate
Description
If a malicious attacker has used another vulnerability to gain full control
over a content process, they may be able to replace the alternate data
resources stored in the JavaScript Start-up Bytecode Cache (JSBC) for other
JavaScript code. If the parent process then runs this replaced code, the
executed script would be run with the parent process' privileges, escaping the
sandbox on content processes.
References
* Bug 1426353
#CVE-2018-5164: CSP not applied to all multipart content sent with multipart/
x-mixed-replace
Reporter
Khalil Zhani
Impact
moderate
Description
Content Security Policy (CSP) is not applied correctly to all parts of
multipart content sent with the multipart/x-mixed-replace MIME type. This could
allow for script to run where CSP should block it, allowing for cross-site
scripting (XSS) and other attacks.
References
* Bug 1416045
#CVE-2018-5166: WebExtension host permission bypass through filterReponseData
Reporter
Francois Lajeunesse Robert
Impact
moderate
Description
WebExtensions can use request redirection and a filterReponseData filter to
bypass host permission settings to redirect network traffic and access content
from a host for which they do not have explicit user permission.
References
* Bug 1437325
#CVE-2018-5167: Improper linkification of chrome: and javascript: content in
web console and JavaScript debugger
Reporter
Wladimir Palant
Impact
moderate
Description
The web console and JavaScript debugger do not sanitize all output that can be
hyperlinked. Both will display chrome: links as active, clickable hyperlinks in
their output. Web sites should not be able to directly link to internal chrome
pages. Additionally, the JavaScript debugger will display javascript: links,
which users could be tricked into clicking by malicious sites.
References
* Bug 1447969
#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-2018-5169: Dragging and dropping link text onto home button can set home
page to include chrome pages
Reporter
Abdulrahman Alqabandi
Impact
moderate
Description
If manipulated hyperlinked text with chrome: URL contained in it is dragged and
dropped on the "home" icon, the home page can be reset to include a
normally-unlinkable chrome page as one of the home page tabs.
References
* Bug 1319157
#CVE-2018-5172: Pasted script from clipboard can run in the Live Bookmarks page
or PDF viewer
Reporter
Abdulrahman Alqabandi
Impact
moderate
Description
The Live Bookmarks page and the PDF viewer can run injected script content if a
user pastes script from the clipboard into them while viewing RSS feeds or PDF
files. This could allow a malicious site to socially engineer a user to copy
and paste malicious script content that could then run with the context of
either page but does not allow for privilege escalation.
References
* Bug 1436482
#CVE-2018-5173: File name spoofing of Downloads panel with Unicode characters
Reporter
Abdulrahman Alqabandi
Impact
moderate
Description
The filename appearing in the Downloads panel improperly renders some Unicode
characters, allowing for the file name to be spoofed. This can be used to
obscure the file extension of potentially executable files from user view in
the panel.
Note: the dialog to open the file will show the full, correct filename and
whether it is executable or not.
References
* Bug 1438025
#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-2018-5175: Universal CSP bypass on sites using strict-dynamic in their
policies
Reporter
Masato Kinugawa
Impact
moderate
Description
A mechanism to bypass Content Security Policy (CSP) protections on sites that
have a script-src policy of 'strict-dynamic'. If a target website contains an
HTML injection flaw an attacker could inject a reference to a copy of the
require.js library that is part of Firefox?s Developer Tools, and then use a
known technique using that library to bypass the CSP restrictions on executing
injected scripts.
References
* Bug 1432358
#CVE-2018-5176: JSON Viewer script injection
Reporter
Tadj Youssouf
Impact
moderate
Description
The JSON Viewer displays clickable hyperlinks for strings that are parseable as
URLs, including javascript: links. If a JSON file contains malicious JavaScript
script embedded as javascript: links, users may be tricked into clicking and
running this code in the context of the JSON Viewer. This can allow for the
theft of cookies and authorization tokens which are accessible to that context.
References
* Bug 1442840
#CVE-2018-5177: Buffer overflow in XSLT during number formatting
Reporter
Guyio
Impact
moderate
Description
A vulnerability exists in XSLT during number formatting where a negative buffer
size may be allocated in some instances, leading to a buffer overflow and crash
if it occurs.
References
* Bug 1451908
#CVE-2018-5165: Checkbox for enabling Flash protected mode is inverted in
32-bit Firefox
Reporter
David Parks
Impact
low
Description
In 32-bit versions of Firefox, the Adobe Flash plugin setting for "Enable Adobe
Flash protected mode" is unchecked by default even though the Adobe Flash
sandbox is actually enabled. The displayed state is the reverse of the true
setting, resulting in user confusion. This could cause users to select this
setting intending to activate it and inadvertently turn protections off.
References
* Bug 1451452
#CVE-2018-5180: heap-use-after-free in
mozilla::WebGLContext::DrawElementsInstanced
Reporter
Nils
Impact
low
Description
A use-after-free vulnerability can occur during WebGL operations. While this
results in a potentially exploitable crash, the vulnerability is limited
because the memory is freed and reused in a brief window of time during the
freeing of the same callstack.
References
* Bug 1444086
#CVE-2018-5181: Local file can be displayed in noopener tab through drag and
drop of hyperlink
Reporter
Abdulrahman Alqabandi
Impact
low
Description
If a URL using the file: protocol is dragged and dropped onto an open tab that
is running in a different child process the tab will open a local file
corresponding to the dropped URL, contrary to policy. One way to make the
target tab open more reliably in a separate process is to open it with the
noopener keyword.
References
* Bug 1424107
#CVE-2018-5182: Local file can be displayed from hyperlink dragged and dropped
on addressbar
Reporter
Jordi Chancel
Impact
low
Description
If a text string that happens to be a filename in the operating system's native
format is dragged and dropped onto the addressbar the specified local file will
be opened. This is contrary to policy and is what would happen if the string
were the equivalent file: URL.
References
* Bug 1435908
#CVE-2018-5151: Memory safety bugs fixed in Firefox 60
Reporter
Mozilla developers and community
Impact
critical
Description
Mozilla developers and community members Christoph Diehl, Christian Holler, Jon
Coppeard, Jason Kratzer, Nathan Froyd, Paul Theriault, Ryan VanderMeulen, Tyson
Smith, Sebastian Hengst, Byron Campen, Emilio Cobos ?lvarez, Ronald Crane, and
Phillipp reported memory safety bugs present in Firefox 59. 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.
References
* Memory safety bugs fixed in Firefox 60
#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."
MITIGATION
Users are advised to update to Firefox version 60 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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