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

webkit2gtk vulnerabilities
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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