==========================================================================
Ubuntu Security Notice USN-3687-1
June 18, 2018

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

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

- Ubuntu 18.04 LTS
- Ubuntu 17.10
- 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     2.20.3-0ubuntu0.18.04.1
  libwebkit2gtk-4.0-37            2.20.3-0ubuntu0.18.04.1

Ubuntu 17.10:
  libjavascriptcoregtk-4.0-18     2.20.3-0ubuntu0.17.10.1
  libwebkit2gtk-4.0-37            2.20.3-0ubuntu0.17.10.1

Ubuntu 16.04 LTS:
  libjavascriptcoregtk-4.0-18     2.20.3-0ubuntu0.16.04.1
  libwebkit2gtk-4.0-37            2.20.3-0ubuntu0.16.04.1

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-3687-1
  CVE-2018-12293, CVE-2018-4190, CVE-2018-4199, CVE-2018-4218,
  CVE-2018-4222, CVE-2018-4232, CVE-2018-4233

Package Information:
  https://launchpad.net/ubuntu/+source/webkit2gtk/2.20.3-0ubuntu0.18.04.1
  https://launchpad.net/ubuntu/+source/webkit2gtk/2.20.3-0ubuntu0.17.10.1
  https://launchpad.net/ubuntu/+source/webkit2gtk/2.20.3-0ubuntu0.16.04.1