The following updates has been released for Ubuntu Linux:

USN-3874-1: Firefox vulnerabilities
USN-3875-1: OpenJDK vulnerability

USN-3874-1: Firefox vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3874-1
January 30, 2019

firefox vulnerabilities
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Firefox could be made to crash or run programs as your login if it
opened a malicious website.

Software Description:
- firefox: Mozilla Open Source web browser

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, gain additional
privileges by escaping the sandbox, or execute arbitrary code.
(CVE-2018-18500, CVE-2018-18501, CVE-2018-18502, CVE-2018-18503,
CVE-2018-18504, CVE-2018-18505)

It was discovered that Firefox allowed PAC files to specify that requests
to localhost are sent through the proxy to another server. If proxy
auto-detection is enabled, an attacker could potentially exploit this to
conduct attacks on local services and tools. (CVE-2018-18506)

Update instructions:

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

Ubuntu 18.10:
  firefox  65.0+build2-0ubuntu0.18.10.1

Ubuntu 18.04 LTS:
  firefox 65.0+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox  65.0+build2-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  firefox  65.0+build2-0ubuntu0.14.04.1

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

References:
  https://usn.ubuntu.com/usn/usn-3874-1
  CVE-2018-18500, CVE-2018-18501, CVE-2018-18502, CVE-2018-18503,
  CVE-2018-18504, CVE-2018-18505, CVE-2018-18506

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/65.0+build2-0ubuntu0.18.10.1
  https://launchpad.net/ubuntu/+source/firefox/65.0+build2-0ubuntu0.18.04.1
  https://launchpad.net/ubuntu/+source/firefox/65.0+build2-0ubuntu0.16.04.1
  https://launchpad.net/ubuntu/+source/firefox/65.0+build2-0ubuntu0.14.04.1

USN-3875-1: OpenJDK vulnerability

=========================================================================
Ubuntu Security Notice USN-3875-1
January 30, 2019

openjdk-8, openjdk-lts vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10
- Ubuntu 16.04 LTS

Summary:

Java applets or applications could be made to expose sensitive
information.

Software Description:
- openjdk-lts: Open Source Java implementation
- openjdk-8: Open Source Java implementation

Details:

It was discovered that a memory disclosure issue existed in the OpenJDK
Library subsystem. An attacker could use this to expose sensitive
information and possibly bypass Java sandbox restrictions. (CVE-2019-2422)

Update instructions:

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

Ubuntu 18.10:
openjdk-11-jdk 11.0.1+13-3ubuntu3.18.10.1
openjdk-11-jre 11.0.1+13-3ubuntu3.18.10.1
openjdk-11-jre-headless 11.0.1+13-3ubuntu3.18.10.1

Ubuntu 16.04 LTS:
openjdk-8-jdk 8u191-b12-2ubuntu0.16.04.1
openjdk-8-jre 8u191-b12-2ubuntu0.16.04.1
openjdk-8-jre-headless 8u191-b12-2ubuntu0.16.04.1
openjdk-8-jre-jamvm 8u191-b12-2ubuntu0.16.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any Java
applications or applets to make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3875-1
CVE-2019-2422

Package Information:
https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.1+13-3ubuntu3.18.10.1
https://launchpad.net/ubuntu/+source/openjdk-8/8u191-b12-2ubuntu0.16.04.1