USN-3260-2: Firefox regression

Ubuntu Security Notice USN-3260-2

11th May, 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


USN-3260-1 caused a regression in Firefox.

Software description

  • firefox - Mozilla Open Source web browser


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.

Update instructions

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

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

To update your system, please follow these instructions:

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


LP: 1690195