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             AUSCERT External Security Bulletin Redistribution

                   USN-4894-1: WebKitGTK vulnerabilities
                               30 March 2021


        AusCERT Security Bulletin Summary

Product:           WebKitGTK
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Remote with User Interaction
                   Provide Misleading Information  -- Remote with User Interaction
                   Unauthorised Access             -- Remote with User Interaction
                   Reduced Security                -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-1870 CVE-2021-1801 CVE-2021-1799
                   CVE-2021-1789 CVE-2021-1765 CVE-2020-29623

Reference:         ESB-2021.1071

Original Bulletin: 

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USN-4894-1: WebKitGTK vulnerabilities
29 March 2021

Several security issues were fixed in WebKitGTK.

  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS


  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 20.10

  o libwebkit2gtk-4.0-37 - 2.30.6-0ubuntu0.20.10.1
  o libjavascriptcoregtk-4.0-18 - 2.30.6-0ubuntu0.20.10.1

Ubuntu 20.04

  o libwebkit2gtk-4.0-37 - 2.30.6-0ubuntu0.20.04.1
  o libjavascriptcoregtk-4.0-18 - 2.30.6-0ubuntu0.20.04.1

Ubuntu 18.04

  o libwebkit2gtk-4.0-37 - 2.30.6-0ubuntu0.18.04.1
  o libjavascriptcoregtk-4.0-18 - 2.30.6-0ubuntu0.18.04.1

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.


  o CVE-2021-1765
  o CVE-2020-27918
  o CVE-2021-1870
  o CVE-2021-1801
  o CVE-2020-29623
  o CVE-2021-1789
  o CVE-2021-1799

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