The following updates has been released for Ubuntu Linux:

USN-4130-1: WebKitGTK+ vulnerabilities
USN-4131-1: VLC vulnerabilities

USN-4130-1: WebKitGTK+ vulnerabilities

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Ubuntu Security Notice USN-4130-1
September 11, 2019

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

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

- Ubuntu 19.04
- Ubuntu 18.04 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 19.04:
libjavascriptcoregtk-4.0-18 2.24.4-0ubuntu0.19.04.1
libwebkit2gtk-4.0-37 2.24.4-0ubuntu0.19.04.1

Ubuntu 18.04 LTS:
libjavascriptcoregtk-4.0-18 2.24.4-0ubuntu0.18.04.1
libwebkit2gtk-4.0-37 2.24.4-0ubuntu0.18.04.1

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/4130-1
CVE-2019-8644, CVE-2019-8649, CVE-2019-8658, CVE-2019-8666,
CVE-2019-8669, CVE-2019-8673, CVE-2019-8676, CVE-2019-8678,
CVE-2019-8680, CVE-2019-8681, CVE-2019-8683, CVE-2019-8684,
CVE-2019-8687, CVE-2019-8688, CVE-2019-8689, CVE-2019-8690

Package Information:
https://launchpad.net/ubuntu/+source/webkit2gtk/2.24.4-0ubuntu0.19.04.1
https://launchpad.net/ubuntu/+source/webkit2gtk/2.24.4-0ubuntu0.18.04.1

USN-4131-1: VLC vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4131-1
September 11, 2019

vlc vulnerabilities
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in VLC.

Software Description:
- vlc: multimedia player and streamer

Details:

It was discovered that VLC incorrectly handled certain media files. If a
user were tricked into opening a specially-crafted file, a remote attacker
could use this issue to cause VLC to crash, resulting in a denial of
service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 19.04:
vlc 3.0.8-0ubuntu19.04.1

Ubuntu 18.04 LTS:
vlc 3.0.8-0ubuntu18.04.1

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

References:
https://usn.ubuntu.com/4131-1
CVE-2019-13962, CVE-2019-14437, CVE-2019-14438, CVE-2019-14498,
CVE-2019-14533, CVE-2019-14534, CVE-2019-14535, CVE-2019-14776,
CVE-2019-14777, CVE-2019-14778, CVE-2019-14970

Package Information:
https://launchpad.net/ubuntu/+source/vlc/3.0.8-0ubuntu19.04.1
https://launchpad.net/ubuntu/+source/vlc/3.0.8-0ubuntu18.04.1