Updated Firefox packages has been released for Ubuntu Linux to address a regression introduced by the previous update

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Ubuntu Security Notice USN-3991-3
June 14, 2019

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

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

USN-3991-2 caused a regression in Firefox

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-3991-1 fixed vulnerabilities in Firefox, and USN-3991-2 fixed a
subsequent regression. The update caused an additional regression that
resulted in Firefox failing to load correctly after executing it in safe
mode. 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, spoof the browser
 UI, trick the user in to launching local executable binaries, obtain
 sensitive information, conduct cross-site scripting (XSS) attacks, or
 execute arbitrary code. (CVE-2019-11691, CVE-2019-11692, CVE-2019-11693,
 CVE-2019-11695, CVE-2019-11696, CVE-2019-11699, CVE-2019-11701,
 CVE-2019-7317, CVE-2019-9800, CVE-2019-9814, CVE-2019-9817, CVE-2019-9819,
 CVE-2019-9820, CVE-2019-9821)
 
 It was discovered that pressing certain key combinations could bypass
 addon installation prompt delays. If a user opened a specially crafted
 website, an attacker could potentially exploit this to trick them in to
 installing a malicious extension. (CVE-2019-11697)
 
 It was discovered that history data could be exposed via drag and drop
 of hyperlinks to and from bookmarks. If a user were tricked in to dragging
 a specially crafted hyperlink to the bookmark toolbar or sidebar, and
 subsequently back in to the web content area, an attacker could
 potentially exploit this to obtain sensitive information. (CVE-2019-11698)
 
 A type confusion bug was discovered with object groups and UnboxedObjects.
 If a user were tricked in to opening a specially crafted website after
 enabling the UnboxedObjects feature, an attacker could potentially
 exploit this to bypass security checks. (CVE-2019-9816)

Update instructions:

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

Ubuntu 19.04:
  firefox 67.0.2+build2-0ubuntu0.19.04.1

Ubuntu 18.10:
  firefox 67.0.2+build2-0ubuntu0.18.10.1

Ubuntu 18.04 LTS:
  firefox 67.0.2+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox 67.0.2+build2-0ubuntu0.16.04.1

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

References:
  https://usn.ubuntu.com/3991-3
  https://usn.ubuntu.com/3991-1
  https://launchpad.net/bugs/1832907

Package Information:

https://launchpad.net/ubuntu/+source/firefox/67.0.2+build2-0ubuntu0.19.04.1

https://launchpad.net/ubuntu/+source/firefox/67.0.2+build2-0ubuntu0.18.10.1

https://launchpad.net/ubuntu/+source/firefox/67.0.2+build2-0ubuntu0.18.04.1

https://launchpad.net/ubuntu/+source/firefox/67.0.2+build2-0ubuntu0.16.04.1

  Firefox Update for Ubuntu