=========================================================================Ubuntu Security Notice USN-2743-3
September 24, 2015

unity-firefox-extension, webapps-greasemonkey, webaccounts-browser-extension update
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.04
- Ubuntu 14.04 LTS

Summary:

This update provides compatible packages for Firefox 41

Software Description:
- 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 LTS:
  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://ubuntu.com/security/notices/USN-2743-3
  https://ubuntu.com/security/notices/USN-2743-1
  https://bugs.launchpad.net/ubuntu/+source/unity-firefox-extension/+bug/1069793, https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1498681

Package Information:
  https://launchpad.net/ubuntu/+source/unity-firefox-extension/3.0.0+14.04.20140416-0ubuntu1.15.04.1
  https://launchpad.net/ubuntu/+source/webaccounts-browser-extension/0.5-0ubuntu4.15.04.1
  https://launchpad.net/ubuntu/+source/webapps-greasemonkey/2.3.6+14.10.20140701-0ubuntu1.15.04.1
  https://launchpad.net/ubuntu/+source/unity-firefox-extension/3.0.0+14.04.20140416-0ubuntu1.14.04.1
  https://launchpad.net/ubuntu/+source/webaccounts-browser-extension/0.5-0ubuntu2.14.04.1
  https://launchpad.net/ubuntu/+source/webapps-greasemonkey/2.3.6+13.10.20130920.1-0ubuntu1.2