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Ubuntu Security Notice USN-3991-2
June 06, 2019

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

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-3991-1 caused a regression in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-3991-1 fixed vulnerabilities in Firefox. The update caused a
regression which resulted in issues when upgrading between Ubuntu
releases. 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                         67.0.1+build1-0ubuntu0.19.04.1

Ubuntu 18.10:
  firefox                         67.0.1+build1-0ubuntu0.18.10.1

Ubuntu 18.04 LTS:
  firefox                         67.0.1+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox                         67.0.1+build1-0ubuntu0.16.04.1

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

References:
  https://usn.ubuntu.com/3991-2
  https://usn.ubuntu.com/3991-1
  https://launchpad.net/bugs/1830096

Package Information:
 
https://launchpad.net/ubuntu/+source/firefox/67.0.1+build1-0ubuntu0.19.04.1
 
https://launchpad.net/ubuntu/+source/firefox/67.0.1+build1-0ubuntu0.18.10.1
 
https://launchpad.net/ubuntu/+source/firefox/67.0.1+build1-0ubuntu0.18.04.1
 
https://launchpad.net/ubuntu/+source/firefox/67.0.1+build1-0ubuntu0.16.04.1