[USN-2936-3] Firefox regression

[Chris Coulson]

==========================================================================
Ubuntu Security Notice USN-2936-3
May 19, 2016

firefox regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS
- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

USN-2936-1 introduced a regression in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-2936-1 fixed vulnerabilities in Firefox. The update caused an issue
where a device update POST request was sent every time about:preferences#sync
was shown. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 Christian Holler, Tyson Smith, Phil Ringalda, Gary Kwong, Jesse Ruderman,
 Mats Palmgren, Carsten Book, Boris Zbarsky, David Bolter, Randell Jesup,
 Andrew McCreight, and Steve Fink 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-2016-2804, CVE-2016-2806,
 CVE-2016-2807)
 
 An invalid write was discovered when using the JavaScript .watch() method 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-2016-2808)
 
 Looben Yang discovered a use-after-free and buffer overflow in service
 workers. 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-2016-2811, CVE-2016-2812)
 
 Sascha Just discovered a buffer overflow in libstagefright 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-2016-2814)
 
 Muneaki Nishimura discovered that CSP is not applied correctly to web
 content sent with the multipart/x-mixed-replace MIME type. An attacker
 could potentially exploit this to conduct cross-site scripting (XSS)
 attacks when they would otherwise be prevented. (CVE-2016-2816)
 
 Muneaki Nishimura discovered that the chrome.tabs.update API for web
 extensions allows for navigation to javascript: URLs. A malicious
 extension could potentially exploit this to conduct cross-site scripting
 (XSS) attacks. (CVE-2016-2817)
 
 Mark Goodwin discovered that about:healthreport accepts certain events
 from any content present in the remote-report iframe. If another
 vulnerability allowed the injection of web content in the remote-report
 iframe, an attacker could potentially exploit this to change the user's
 sharing preferences. (CVE-2016-2820)

Update instructions:

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

Ubuntu 16.04 LTS:
  firefox                         46.0.1+build1-0ubuntu0.16.04.2

Ubuntu 15.10:
  firefox                         46.0.1+build1-0ubuntu0.15.10.2

Ubuntu 14.04 LTS:
  firefox                         46.0.1+build1-0ubuntu0.14.04.3

Ubuntu 12.04 LTS:
  firefox                         46.0.1+build1-0ubuntu0.12.04.2

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

References:
  http://www.ubuntu.com/usn/usn-2936-3
  http://www.ubuntu.com/usn/usn-2936-1
  https://launchpad.net/bugs/1583389

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/46.0.1+build1-0ubuntu0.16.04.2
  https://launchpad.net/ubuntu/+source/firefox/46.0.1+build1-0ubuntu0.15.10.2
  https://launchpad.net/ubuntu/+source/firefox/46.0.1+build1-0ubuntu0.14.04.3
  https://launchpad.net/ubuntu/+source/firefox/46.0.1+build1-0ubuntu0.12.04.2


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