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             AUSCERT External Security Bulletin Redistribution

                        WebKitGTK+ vulnerabilities
                              17 August 2018


        AusCERT Security Bulletin Summary

Product:           webkit2gtk
Publisher:         Ubuntu
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
Resolution:        Patch/Upgrade
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
                   CVE-2018-4261 CVE-2018-4246 

Reference:         ESB-2018.2295

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-3743-1: WebKitGTK+ vulnerabilities

16 August 2018

webkit2gtk vulnerabilities

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+.

Software Description

  o webkit2gtk - Web content engine library for GTK+


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

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

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.


  o CVE-2018-12911
  o CVE-2018-4246
  o CVE-2018-4261
  o CVE-2018-4262
  o CVE-2018-4263
  o CVE-2018-4264
  o CVE-2018-4265
  o CVE-2018-4266
  o CVE-2018-4267
  o CVE-2018-4270
  o CVE-2018-4272
  o CVE-2018-4273
  o CVE-2018-4278
  o CVE-2018-4284

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