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Ubuntu Security Notice USN-3477-2
November 27, 2017

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

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

- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-3477-1 caused a regression in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-3477-1 fixed vulnerabilities in Firefox. The update caused search
suggestions to not be displayed when performing Google searches from the
search bar. 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 cause a denial of service, read uninitialized
 memory, obtain sensitive information, bypass same-origin restrictions,
 bypass CSP protections, bypass mixed content blocking, spoof the
 addressbar, or execute arbitrary code. (CVE-2017-7826, CVE-2017-7827,
 CVE-2017-7828, CVE-2017-7830, CVE-2017-7831, CVE-2017-7832, CVE-2017-7833,
 CVE-2017-7834, CVE-2017-7835, CVE-2017-7837, CVE-2017-7838, CVE-2017-7842)
 
 It was discovered that javascript: URLs pasted in to the addressbar
 would be executed instead of being blocked in some circumstances. If a
 user were tricked in to copying a specially crafted URL in to the
 addressbar, an attacker could potentially exploit this to conduct
 cross-site scripting (XSS) attacks. (CVE-2017-7839)
 
 It was discovered that exported bookmarks do not strip script elements
 from user-supplied tags. If a user were tricked in to adding specially
 crafted tags to bookmarks, exporting them and then opening the resulting
 HTML file, an attacker could potentially exploit this to conduct
 cross-site scripting (XSS) attacks. (CVE-2017-7840)

Update instructions:

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

Ubuntu 17.10:
  firefox                         57.0+build4-0ubuntu0.17.10.6

Ubuntu 17.04:
  firefox                         57.0+build4-0ubuntu0.17.04.6

Ubuntu 16.04 LTS:
  firefox                         57.0+build4-0ubuntu0.16.04.6

Ubuntu 14.04 LTS:
  firefox                         57.0+build4-0ubuntu0.14.04.5

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

References:
  https://www.ubuntu.com/usn/usn-3477-2
  https://www.ubuntu.com/usn/usn-3477-1
  https://launchpad.net/bugs/1733970

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/57.0+build4-0ubuntu0.17.10.6
  https://launchpad.net/ubuntu/+source/firefox/57.0+build4-0ubuntu0.17.04.6
  https://launchpad.net/ubuntu/+source/firefox/57.0+build4-0ubuntu0.16.04.6
  https://launchpad.net/ubuntu/+source/firefox/57.0+build4-0ubuntu0.14.04.5