Releases

• Ubuntu 15.04
• Ubuntu 14.04 ESM

Packages

• unity-firefox-extension - Unity Integration for Firefox
• webaccounts-browser-extension - Ubuntu Online Accounts extension for chromium
• webapps-greasemonkey - Firefox extension: Website Integration

Details

USN-2743-1 fixed vulnerabilities in Firefox. Future Firefox updates will
require all addons be signed and unity-firefox-extension, webapps-greasemonkey
and webaccounts-browser-extension will not go through the signing process.
Because these addons currently break search engine installations (LP:

1069793), this update permanently disables the addons by removing them from

the system.

We apologize for any inconvenience.

Original advisory details:

Andrew Osmond, Olli Pettay, Andrew Sutherland, Christian Holler, David
Major, Andrew McCreight, Cameron McCormack, Bob Clary and Randell Jesup
discovered multiple memory safety issues in Firefox. If a user were
tricked in to opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service via application
crash, or execute arbitrary code with the privileges of the user invoking
Firefox. (CVE-2015-4500, CVE-2015-4501)

André Bargull discovered that when a web page creates a scripted proxy
for the window with a handler defined a certain way, a reference to the
inner window will be passed, rather than that of the outer window.
(CVE-2015-4502)

Felix Gröbert discovered an out-of-bounds read in the QCMS color
management library in some circumstances. If a user were tricked in to
opening a specially crafted website, an attacker could potentially exploit
this to cause a denial of service via application crash, or obtain
sensitive information. (CVE-2015-4504)

Khalil Zhani discovered a buffer overflow when parsing VP9 content in some
circumstances. If a user were tricked in to opening a specially crafted
website, an attacker could potentially exploit this to cause a denial of
service via application crash, or execute arbitrary code with the
privileges of the user invoking Firefox. (CVE-2015-4506)

Spandan Veggalam discovered a crash while using the debugger API in some
circumstances. If a user were tricked in to opening a specially crafted
website whilst using the debugger, an attacker could potentially exploit
this to execute arbitrary code with the privileges of the user invoking
Firefox. (CVE-2015-4507)

Juho Nurminen discovered that the URL bar could display the wrong URL in
reader mode in some circumstances. If a user were tricked in to opening a
specially crafted website, an attacker could potentially exploit this to
conduct URL spoofing attacks. (CVE-2015-4508)

A use-after-free was discovered when manipulating HTML media content in
some circumstances. If a user were tricked in to opening a specially
crafted website, an attacker could potentially exploit this to cause a
denial of service via application crash, or execute arbitrary code with
the privileges of the user invoking Firefox. (CVE-2015-4509)

Looben Yang discovered a use-after-free when using a shared worker with
IndexedDB in some circumstances. If a user were tricked in to opening a
specially crafted website, an attacker could potentially exploit this to
cause a denial of service via application crash, or execute arbitrary code
with the privileges of the user invoking Firefox. (CVE-2015-4510)

Francisco Alonso discovered an out-of-bounds read during 2D canvas
rendering in some circumstances. If a user were tricked in to opening a
specially crafted website, an attacker could potentially exploit this to
obtain sensitive information. (CVE-2015-4512)

Jeff Walden discovered that changes could be made to immutable properties
in some circumstances. If a user were tricked in to opening a specially
crafted website, an attacker could potentially exploit this to execute
arbitrary script in a privileged scope. (CVE-2015-4516)

Ronald Crane reported multiple vulnerabilities. If a user were tricked in
to opening a specially crafted website, an attacker could potentially
exploit these to cause a denial of service via application crash, or
execute arbitrary code with the privileges of the user invoking Firefox.
(CVE-2015-4517, CVE-2015-4521, CVE-2015-4522, CVE-2015-7174,
CVE-2015-7175, CVE-2015-7176, CVE-2015-7177, CVE-2015-7180)

Mario Gomes discovered that dragging and dropping an image after a
redirect exposes the redirected URL to scripts. An attacker could
potentially exploit this to obtain sensitive information. (CVE-2015-4519)

Ehsan Akhgari discovered 2 issues with CORS preflight requests. An
attacker could potentially exploit these to bypass CORS restrictions.
(CVE-2015-4520)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 15.04

• xul-ext-unity - 3.0.0+14.04.20140416-0ubuntu1.15.04.1
• xul-ext-webaccounts - 0.5-0ubuntu4.15.04.1
• xul-ext-websites-integration - 2.3.6+14.10.20140701-0ubuntu1.15.04.1

Ubuntu 14.04

• xul-ext-unity - 3.0.0+14.04.20140416-0ubuntu1.14.04.1
• xul-ext-webaccounts - 0.5-0ubuntu2.14.04.1
• xul-ext-websites-integration - 2.3.6+13.10.20130920.1-0ubuntu1.2

After a standard system update you need to restart Firefox to make
all the necessary changes.

References

• https://launchpad.net/bugs/1498681
• https://launchpad.net/bugs/1069793