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AUSCERT External Security Bulletin Redistribution
17 August 2018
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Cross-site Scripting -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
CVE Names: CVE-2018-12911 CVE-2018-4284 CVE-2018-4278
CVE-2018-4273 CVE-2018-4272 CVE-2018-4270
CVE-2018-4267 CVE-2018-4266 CVE-2018-4265
CVE-2018-4264 CVE-2018-4263 CVE-2018-4262
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USN-3743-1: WebKitGTK+ vulnerabilities
16 August 2018
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Several security issues were fixed in WebKitGTK+.
o webkit2gtk - Web content engine library for GTK+
A large number of security issues were discovered in the WebKitGTK+ Web and
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.
The problem can be corrected by updating your system to the following package
Ubuntu 18.04 LTS
libwebkit2gtk-4.0-37 - 2.20.5-0ubuntu0.18.04.1
Ubuntu 16.04 LTS
libwebkit2gtk-4.0-37 - 2.20.5-0ubuntu0.16.04.1
To update your system, please follow these instructions: https://
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.
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