A WebKitGTK+ security update has been released for Ubuntu Linux 19.04 and 18.04 LTS. This update addresses a large number of security issues in the WebKitGTK+ Web and JavaScript engines.

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Ubuntu Security Notice USN-4178-1
November 07, 2019

webkit2gtk vulnerabilities
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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 2.26.1-0ubuntu0.19.04.3
libwebkit2gtk-4.0-37 2.26.1-0ubuntu0.19.04.3

Ubuntu 18.04 LTS:
libjavascriptcoregtk-4.0-18 2.26.1-0ubuntu0.18.04.1
libwebkit2gtk-4.0-37 2.26.1-0ubuntu0.18.04.1

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/4178-1
CVE-2019-8625, CVE-2019-8720, CVE-2019-8769, CVE-2019-8771
Package Information:
https://launchpad.net/ubuntu/+source/webkit2gtk/2.26.1-0ubuntu0.19.04.3 https://launchpad.net/ubuntu/+source/webkit2gtk/2.26.1-0ubuntu0.18.04.1