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AUSCERT Security Bulletin
ASB-2017.0007
Security vulnerabilities fixed in Firefox 51 and Firefox ESR 45.7
26 January 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mozilla Firefox
Firefox ESR
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Increased Privileges -- Remote with User Interaction
Access Privileged Data -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2017-5396 CVE-2017-5395 CVE-2017-5394
CVE-2017-5393 CVE-2017-5392 CVE-2017-5391
CVE-2017-5390 CVE-2017-5389 CVE-2017-5388
CVE-2017-5387 CVE-2017-5386 CVE-2017-5385
CVE-2017-5384 CVE-2017-5383 CVE-2017-5382
CVE-2017-5381 CVE-2017-5380 CVE-2017-5379
CVE-2017-5378 CVE-2017-5377 CVE-2017-5376
CVE-2017-5375 CVE-2017-5374 CVE-2017-5373
Member content until: Saturday, February 25 2017
OVERVIEW
Critical vulnerabilities have been identified in Mozilla Firefox
prior to version 51 and Firefox ESR 45.7. [1 - 2]
IMPACT
The vendor has provided the following details regarding the
vulnerability:
"#CVE-2017-5375: Excessive JIT code allocation allows bypass of ASLR
and DEP
JIT code allocation can allow for a bypass of ASLR and DEP
protections leading to potential memory corruption attacks.
#CVE-2017-5376: Use-after-free in XSL
Use-after-free while manipulating XSL in XSLT documents
#CVE-2017-5377: Memory corruption with transforms to create
gradients in Skia
A memory corruption vulnerability in Skia that can occur when using
transforms to make gradients, resulting in a potentially exploitable
crash.
#CVE-2017-5378: Pointer and frame data leakage of Javascript objects
Hashed codes of JavaScript objects are shared between pages. This
allows for pointer leaks because an object’s address can be
discovered through hash codes, and also allows for data leakage of
an object’s content using these hash codes.
#CVE-2017-5379: Use-after-free in Web Animations
Use-after-free vulnerability in Web Animations when interacting with
cycle collection found through fuzzing.
#CVE-2017-5380: Potential use-after-free during DOM manipulations
A potential use-after-free found through fuzzing during DOM
manipulation of SVG content.
#CVE-2017-5390: Insecure communication methods in Developer Tools
JSON viewer
The JSON viewer in the Developer Tools uses insecure methods to
create a communication channel for copying and viewing JSON or HTTP
headers data, allowing for potential privilege escalation.
#CVE-2017-5389: WebExtensions can install additional add-ons via
modified host requests
WebExtensions could use the mozAddonManager API by modifying the CSP
headers on sites with the appropriate permissions and then using
host requests to redirect script loads to a malicious site. This
allows a malicious extension to then install additional extensions
without explicit user permission.
#CVE-2017-5396: Use-after-free with Media Decoder
A use-after-free vulnerability in the Media Decoder when working
with media files when some events are fired after the media elements
are freed from memory.
#CVE-2017-5381: Certificate Viewer exporting can be used to navigate
and save to arbitrary filesystem locations
The "export" function in the Certificate Viewer can force local
filesystem navigation when the "common name" in a certificate
contains slashes, allowing certificate content to be saved in unsafe
locations with an arbitrary filename.
#CVE-2017-5382: Feed preview can expose privileged content errors
and exceptions
Feed preview for RSS feeds can be used to capture errors and
exceptions generated by privileged content, allowing for the
exposure of internal information not meant to be seen by web
content.
#CVE-2017-5383: Location bar spoofing with unicode characters
URLs containing certain unicode glyphs for alternative hyphens and
quotes do not properly trigger punycode display, allowing for domain
name spoofing attacks in the location bar.
#CVE-2017-5384: Information disclosure via Proxy Auto-Config (PAC)
Proxy Auto-Config (PAC) files can specify a JavaScript function
called for all URL requests with the full URL path which exposes
more information than would be sent to the proxy itself in the case
of HTTPS. Normally the Proxy Auto-Config file is specified by the
user or machine owner and presumed to be non-malicious, but if a
user has enabled Web Proxy Auto Detect (WPAD) this file can be
served remotely.
#CVE-2017-5385: Data sent in multipart channels ignores
referrer-policy response headers
Data sent with in multipart channels, such as the
multipart/x-mixed-replace MIME type, will ignore the referrer-policy
response header, leading to potential information disclosure for
sites using this header.
#CVE-2017-5386: WebExtensions can use data: protocol to affect other
extensions
WebExtension scripts can use the data: protocol to affect pages
loaded by other web extensions using this protocol, leading to
potential data disclosure or privilege escalation in affected
extensions.
#CVE-2017-5394: Android location bar spoofing using fullscreen and
JavaScript events
A location bar spoofing attack where the location bar of loaded page
will be shown over the content of another tab due to a series of
JavaScript events combined with fullscreen mode. Note: This issue
only affects Firefox for Android. Other operating systems are not
affected.
#CVE-2017-5391: Content about: pages can load privileged about:
pages
Special about: pages used by web content, such as RSS feeds, can
load privileged about: pages in an iframe. If a content-injection
bug were found in one of those pages this could allow for potential
privilege escalation.
#CVE-2017-5392: Weak references using multiple threads on weak proxy
objects lead to unsafe memory usage
Weak proxy objects have weak references on multiple threads when
they should only have them on one, resulting in incorrect memory
usage and corruption, which leads to potentially exploitable
crashes. Note: This issue only affects Firefox for Android. Other
operating systems are not affected.
#CVE-2017-5393: Remove addons.mozilla.org CDN from whitelist for
mozAddonManager
The mozAddonManager allows for the installation of extensions from
the CDN for addons.mozilla.org, a publicly accessible site. This
could allow malicious extensions to install additional extensions
from the CDN in combination with an XSS attack on Mozilla AMO sites.
#CVE-2017-5395: Android location bar spoofing during scrolling
Malicious sites can display a spoofed location bar on a subsequently
loaded page when the existing location bar on the new page is
scrolled out of view if navigations between pages can be timed
correctly. Note: This issue only affects Firefox for Android. Other
operating systems are not affected.
#CVE-2017-5387: Disclosure of local file existence through TRACK tag
error messages
The existence of a specifically requested local file can be found
due to the double firing of the onerror when the source attribute on
a <track> tag refers to a file that does not exist if the source
page is loaded locally.
#CVE-2017-5388: WebRTC can be used to generate a large amount of UDP
traffic for DDOS attacks
A STUN server in conjunction with a large number of
webkitRTCPeerConnection objects can be used to send large STUN
packets in a short period of time due to a lack of rate limiting
being applied on e10s systems, allowing for a denial of service
attack.
#CVE-2017-5374: Memory safety bugs fixed in Firefox 51
Mozilla developers and community members Gary Kwong, Olli Pettay,
Tooru Fujisawa, Carsten Book, Andrew McCreight, Chris Pearce, Ronald
Crane, Jan de Mooij, Julian Seward, Nicolas Pierron, Randell Jesup,
Esther Monchari, Honza Bambas, and Philipp reported memory safety
bugs present in Firefox 50.1. 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.
#CVE-2017-5373: Memory safety bugs fixed in Firefox 51 and Firefox
ESR 45.7
Mozilla developers and community members Christian Holler, Gary
Kwong, André Bargull, Jan de Mooij, Tom Schuster, and Oriol reported
memory safety bugs present in Firefox 50.1 and Firefox ESR 45.6.
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
Mozilla advises upgrading to the latest version to address this
issues. [1 -2]
REFERENCES
[1] Mozilla Foundation Security Advisory 2017-01
https://www.mozilla.org/en-US/security/advisories/mfsa2017-01/
[2] Mozilla Foundation Security Advisory 2017-02
https://www.mozilla.org/en-US/security/advisories/mfsa2017-02/
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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