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Ubuntu Security Notice USN-4054-2
July 25, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

USN-4054-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-4054-1 fixed vulnerabilities in Firefox. The update introduced
various minor regressions. This update fixes the problems.

We apologize for the inconvenience.

Original advisory details:

 A sandbox escape was discovered in Firefox. If a user were tricked in to
 installing a malicious language pack, an attacker could exploit this to
 gain additional privileges. (CVE-2019-9811)
 
 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, obtain sensitive
 information, bypass same origin restrictions, conduct cross-site scripting
 (XSS) attacks, conduct cross-site request forgery (CSRF) attacks, spoof
 origin attributes, spoof the addressbar contents, bypass safebrowsing
 protections, or execute arbitrary code. (CVE-2019-11709, CVE-2019-11710,
 CVE-2019-11711, CVE-2019-11712, CVE-2019-11713, CVE-2019-11714,
 CVE-2019-11715, CVE-2019-11716, CVE-2019-11717, CVE-2019-11718,
 CVE-2019-11719, CVE-2019-11720, CVE-2019-11721, CVE-2019-11723,
 CVE-2019-11724, CVE-2019-11725, CVE-2019-11727, CVE-2019-11728,
 CVE-2019-11729)
 
 It was discovered that Firefox treats all files in a directory as same
 origin. If a user were tricked in to downloading a specially crafted HTML
 file, an attacker could potentially exploit this to obtain sensitive
 information from local files. (CVE-2019-11730)

Update instructions:

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

Ubuntu 19.04:
  firefox                         68.0.1+build1-0ubuntu0.19.04.1

Ubuntu 18.04 LTS:
  firefox                         68.0.1+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox                         68.0.1+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/4054-2
  https://usn.ubuntu.com/4054-1
  https://launchpad.net/bugs/1837941

Package Information:
 
https://launchpad.net/ubuntu/+source/firefox/68.0.1+build1-0ubuntu0.19.04.1
 
https://launchpad.net/ubuntu/+source/firefox/68.0.1+build1-0ubuntu0.18.04.1
 
https://launchpad.net/ubuntu/+source/firefox/68.0.1+build1-0ubuntu0.16.04.1