The following updates has been released for Ubuntu Linux:

USN-3858-1: HAProxy vulnerabilities
USN-3859-1: libarchive vulnerabilities

USN-3858-1: HAProxy vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3858-1
January 15, 2019

haproxy vulnerabilities
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in HAProxy.

Software Description:
- haproxy: fast and reliable load balancing reverse proxy

Details:

It was discovered that HAProxy incorrectly handled certain requests.
An attacker could possibly use this to expose sensitive information.
(CVE-2018-20102)

It was discovered that HAProxy incorrectly handled certain requests.
A attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10.
(CVE-2018-20103, CVE-2018-20615)

Update instructions:

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

Ubuntu 18.10:
  haproxy 1.8.13-2ubuntu0.1

Ubuntu 18.04 LTS:
  haproxy 1.8.8-1ubuntu0.3

Ubuntu 16.04 LTS:
  haproxy 1.6.3-1ubuntu0.2

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

References:
  https://usn.ubuntu.com/usn/usn-3858-1
  CVE-2018-20102, CVE-2018-20103, CVE-2018-20615

Package Information:
  https://launchpad.net/ubuntu/+source/haproxy/1.8.13-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/haproxy/1.8.8-1ubuntu0.3
  https://launchpad.net/ubuntu/+source/haproxy/1.6.3-1ubuntu0.2

USN-3859-1: libarchive vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3859-1
January 15, 2019

libarchive 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:

Several security issues were fixed in libarchive.

Software Description:
- libarchive: Library to read/write archive files

Details:

It was discovered that libarchive incorrectly handled certain archive
files. An attacker could possibly use this issue to cause a denial of
service. CVE-2018-1000880 affected only Ubuntu 18.04 and Ubuntu 18.10
LTS. (CVE-2018-1000877, CVE-2018-1000878, CVE-2018-1000880)

It was discovered that libarchive incorrectly handled certain archive
files. An attacker could possibly use this issue to expose sensitive
information. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04
LTS and Ubuntu 18.04 LTS. (CVE-2017-14502)

Update instructions:

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

Ubuntu 18.10:
  libarchive13 3.2.2-5ubuntu0.1

Ubuntu 18.04 LTS:
  libarchive13 3.2.2-3.1ubuntu0.2

Ubuntu 16.04 LTS:
  libarchive13 3.1.2-11ubuntu0.16.04.5

Ubuntu 14.04 LTS:
  libarchive13 3.1.2-7ubuntu2.7

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

References:
  https://usn.ubuntu.com/usn/usn-3859-1
  CVE-2017-14502, CVE-2018-1000877, CVE-2018-1000878, CVE-2018-1000880

Package Information:
  https://launchpad.net/ubuntu/+source/libarchive/3.2.2-5ubuntu0.1
  https://launchpad.net/ubuntu/+source/libarchive/3.2.2-3.1ubuntu0.2
  https://launchpad.net/ubuntu/+source/libarchive/3.1.2-11ubuntu0.16.04.5
  https://launchpad.net/ubuntu/+source/libarchive/3.1.2-7ubuntu2.7