The following two updates has been released for Ubuntu Linux:

USN-3868-1: Thunderbird vulnerabilities
USN-3869-1: Subversion vulnerability

USN-3868-1: Thunderbird vulnerabilities

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Ubuntu Security Notice USN-3868-1
January 24, 2019

thunderbird vulnerabilities
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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:

Several security issues were fixed in Thunderbird.

Software Description:
- thunderbird: Mozilla Open Source mail and newsgroup client

Details:

Multiple security issues were discovered in Thunderbird. If a user were
tricked in to opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
bypass same-origin restrictions, or execute arbitrary code.

Update instructions:

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

Ubuntu 18.10:
  thunderbird  1:60.4.0+build2-0ubuntu0.18.10.1

Ubuntu 18.04 LTS:
  thunderbird  1:60.4.0+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  thunderbird  1:60.4.0+build2-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  thunderbird  1:60.4.0+build2-0ubuntu0.14.04.1

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

References:
  https://usn.ubuntu.com/usn/usn-3868-1
  CVE-2018-12389, CVE-2018-12390, CVE-2018-12392, CVE-2018-12393,
  CVE-2018-12405, CVE-2018-17466, CVE-2018-18492, CVE-2018-18493,
  CVE-2018-18494, CVE-2018-18498

Package Information:
 
https://launchpad.net/ubuntu/+source/thunderbird/1:60.4.0+build2-0ubuntu0.18.10.1
https://launchpad.net/ubuntu/+source/thunderbird/1:60.4.0+build2-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/thunderbird/1:60.4.0+build2-0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/thunderbird/1:60.4.0+build2-0ubuntu0.14.04.1

USN-3869-1: Subversion vulnerability

==========================================================================
Ubuntu Security Notice USN-3869-1
January 24, 2019

subversion vulnerability
==========================================================================

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

- Ubuntu 18.10

Summary:

Subversion could be made to crash if it received a specially crafted
input.

Software Description:
- subversion: Advanced version control system

Details:

Ivan Zhakov discovered that Subversion incorrectly handled certain
inputs. An attacker could possibly use this issue to cause a denial of
service.

Update instructions:

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

Ubuntu 18.10:
  libapache2-mod-svn 1.10.0-2ubuntu2.1
  libsvn1 1.10.0-2ubuntu2.1
  subversion 1.10.0-2ubuntu2.1

In general, a standard system update will make all the necessary
changes.

References:
  https://usn.ubuntu.com/usn/usn-3869-1
  CVE-2018-11803

Package Information:
  https://launchpad.net/ubuntu/+source/subversion/1.10.0-2ubuntu2.1