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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3198
                   USN-5087-1: WebKitGTK vulnerabilities
                             23 September 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           WebKitGTK
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-30858  

Reference:         ESB-2021.3161
                   ESB-2021.3103
                   ESB-2021.3101.2

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5087-1

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USN-5087-1: WebKitGTK vulnerabilities
22 September 2021

Several security issues were fixed in WebKitGTK.
Releases

  o Ubuntu 21.04
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS

Packages

  o 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 21.04

  o libwebkit2gtk-4.0-37 - 2.32.4-0ubuntu0.21.04.1
  o libjavascriptcoregtk-4.0-18 - 2.32.4-0ubuntu0.21.04.1

Ubuntu 20.04

  o libwebkit2gtk-4.0-37 - 2.32.4-0ubuntu0.20.04.1
  o libjavascriptcoregtk-4.0-18 - 2.32.4-0ubuntu0.20.04.1

Ubuntu 18.04

  o libwebkit2gtk-4.0-37 - 2.32.4-0ubuntu0.18.04.1
  o libjavascriptcoregtk-4.0-18 - 2.32.4-0ubuntu0.18.04.1

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

  o CVE-2021-30858

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