The following updates has been released for Ubuntu Linux:

USN-3743-1: WebKitGTK+ vulnerabilities
USN-3744-1: PostgreSQL vulnerabilities

USN-3743-1: WebKitGTK+ vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3743-1
August 16, 2018

webkit2gtk vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in WebKitGTK+.

Software Description:
- webkit2gtk: Web content engine library for GTK+

Details:

A large number of security issues were discovered in the WebKitGTK+ Web and
JavaScript engines. If a user were tricked into viewing a malicious
website, a remote attacker could exploit a variety of issues related to web
browser security, including cross-site scripting attacks, denial of service
attacks, and arbitrary code execution.

Update instructions:

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

Ubuntu 18.04 LTS:
libjavascriptcoregtk-4.0-18 2.20.5-0ubuntu0.18.04.1
libwebkit2gtk-4.0-37 2.20.5-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
libjavascriptcoregtk-4.0-18 2.20.5-0ubuntu0.16.04.1
libwebkit2gtk-4.0-37 2.20.5-0ubuntu0.16.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use WebKitGTK+, such as Epiphany, to make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3743-1
CVE-2018-12911, CVE-2018-4246, CVE-2018-4261, CVE-2018-4262,
CVE-2018-4263, CVE-2018-4264, CVE-2018-4265, CVE-2018-4266,
CVE-2018-4267, CVE-2018-4270, CVE-2018-4272, CVE-2018-4273,
CVE-2018-4278, CVE-2018-4284

Package Information:
https://launchpad.net/ubuntu/+source/webkit2gtk/2.20.5-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/webkit2gtk/2.20.5-0ubuntu0.16.04.1

USN-3744-1: PostgreSQL vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3744-1
August 16, 2018

postgresql-10, postgresql-9.3, postgresql-9.5 vulnerabilities
==========================================================================

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

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

Summary:

Several security issues were fixed in PostgreSQL.

Software Description:
- postgresql-10: object-relational SQL database
- postgresql-9.5: Object-relational SQL database
- postgresql-9.3: Object-relational SQL database

Details:

Andrew Krasichkov discovered that the PostgreSQL client library incorrectly
reset its internal state between connections. A remote attacker could
possibly use this issue to bypass certain client-side connection security
features. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
(CVE-2018-10915)

It was discovered that PostgreSQL incorrectly checked authorization on
certain statements. A remote attacker could possibly use this issue to
read arbitrary server memory or alter certain data. (CVE-2018-10925)

Update instructions:

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

Ubuntu 18.04 LTS:
postgresql-10 10.5-0ubuntu0.18.04

Ubuntu 16.04 LTS:
postgresql-9.5 9.5.14-0ubuntu0.16.04

Ubuntu 14.04 LTS:
postgresql-9.3 9.3.24-0ubuntu0.14.04

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

References:
https://usn.ubuntu.com/usn/usn-3744-1
CVE-2018-10915, CVE-2018-10925

Package Information:
https://launchpad.net/ubuntu/+source/postgresql-10/10.5-0ubuntu0.18.04
https://launchpad.net/ubuntu/+source/postgresql-9.5/9.5.14-0ubuntu0.16.04
https://launchpad.net/ubuntu/+source/postgresql-9.3/9.3.24-0ubuntu0.14.04