==========================================================================
Ubuntu Security Notice USN-3260-2
May 11, 2017

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

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

- Ubuntu 17.04
- Ubuntu 16.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-3260-1 caused a regression in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-3260-1 fixed vulnerabilities in Firefox. The update caused the
date picker panel and form validation errors to close immediately on
opening. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 Multiple security issues were discovered in Firefox. If a user were
 tricked in to opening a specially crafted website, an attacker could
 potentially exploit these to read uninitialized memory, obtain sensitive
 information, spoof the addressbar contents or other UI elements, escape
 the sandbox to read local files, conduct cross-site scripting (XSS)
 attacks, cause a denial of service via application crash, or execute
 arbitrary code. (CVE-2017-5429, CVE-2017-5430, CVE-2017-5432,
 CVE-2017-5433, CVE-2017-5434, CVE-2017-5435, CVE-2017-5436, CVE-2017-5437,
 CVE-2017-5438, CVE-2017-5439, CVE-2017-5440, CVE-2017-5441, CVE-2017-5442,
 CVE-2017-5443, CVE-2017-5444, CVE-2017-5445, CVE-2017-5446, CVE-2017-5447,
 CVE-2017-5448, CVE-2017-5449, CVE-2017-5451, CVE-2017-5453, CVE-2017-5454,
 CVE-2017-5455, CVE-2017-5456, CVE-2017-5458, CVE-2017-5459, CVE-2017-5460,
 CVE-2017-5461, CVE-2017-5464, CVE-2017-5465, CVE-2017-5466, CVE-2017-5467,
 CVE-2017-5468, CVE-2017-5469)
 
 A flaw was discovered in the DRBG number generation in NSS. If an
 attacker were able to perform a man-in-the-middle attack, this flaw
 could potentially be exploited to view sensitive information.
 (CVE-2017-5462)

Update instructions:

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

Ubuntu 17.04:
  firefox                         53.0.2+build1-0ubuntu0.17.04.2

Ubuntu 16.10:
  firefox                         53.0.2+build1-0ubuntu0.16.10.2

Ubuntu 16.04 LTS:
  firefox                         53.0.2+build1-0ubuntu0.16.04.2

Ubuntu 14.04 LTS:
  firefox                         53.0.2+build1-0ubuntu0.14.04.2

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

References:
  https://www.ubuntu.com/usn/usn-3260-2
  https://www.ubuntu.com/usn/usn-3260-1
  https://launchpad.net/bugs/1690195

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/53.0.2+build1-0ubuntu0.17.04.2
  https://launchpad.net/ubuntu/+source/firefox/53.0.2+build1-0ubuntu0.16.10.2
  https://launchpad.net/ubuntu/+source/firefox/53.0.2+build1-0ubuntu0.16.04.2
  https://launchpad.net/ubuntu/+source/firefox/53.0.2+build1-0ubuntu0.14.04.2