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Ubuntu Security Notice USN-3781-2
October 10, 2018

webkit2gtk regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

USN-3781-1 introduced a regression in WebKitGTK+.

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

Details:

USN-3781-1 fixed vulnerabilities in WebKitGTK+. The updated package was
missing some header files, preventing certain applications from building.
This update fixes the problem.

We apologize for the inconvenience.

Original advisory 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     2.22.2-0ubuntu0.18.04.2
  libwebkit2gtk-4.0-37            2.22.2-0ubuntu0.18.04.2

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-3781-2
  https://usn.ubuntu.com/usn/usn-3781-1
  https://launchpad.net/bugs/1795901

Package Information:
  https://launchpad.net/ubuntu/+source/webkit2gtk/2.22.2-0ubuntu0.18.04.2