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             AUSCERT External Security Bulletin Redistribution

                    USN-5131-1: Firefox vulnerabilities
                              4 November 2021


        AusCERT Security Bulletin Summary

Product:           Firefox
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
                   Access Confidential Data        -- Remote with User Interaction
                   Reduced Security                -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-38509 CVE-2021-38508 CVE-2021-38507
                   CVE-2021-38506 CVE-2021-38504 CVE-2021-38503

Reference:         ESB-2021.3680

Original Bulletin: 

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

USN-5131-1: Firefox vulnerabilities
03 November 2021

Firefox could be made to crash or run programs as your login if it
opened a malicious website.

  o Ubuntu 21.10
  o Ubuntu 21.04
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS


  o firefox - Mozilla Open Source web browser


Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, bypass security
restrictions, spoof the browser UI, confuse the user, conduct phishing
attacks, or execute arbitrary code. ( CVE-2021-38503 , CVE-2021-38504 ,
CVE-2021-38506 , CVE-2021-38507 , CVE-2021-38508 , CVE-2021-38509 )

It was discovered that the 'Copy Image Link' context menu action
would copy the final image URL after redirects. If a user were tricked
into copying and pasting a link for an embedded image that triggered
authentication flows back to the page, an attacker could potentially
exploit this to steal authentication tokens.

Update instructions

The problem can be corrected by updating your system to the following package

Ubuntu 21.10

  o firefox - 94.0+build3-0ubuntu0.21.10.1

Ubuntu 21.04

  o firefox - 94.0+build3-0ubuntu0.21.04.1

Ubuntu 20.04

  o firefox - 94.0+build3-0ubuntu0.20.04.1

Ubuntu 18.04

  o firefox - 94.0+build3-0ubuntu0.18.04.1

After a standard system update you need to restart Firefox to make
all the necessary changes.


  o CVE-2021-38507
  o CVE-2021-38509
  o CVE-2021-38508
  o CVE-2021-38503
  o CVE-2021-38504
  o CVE-2021-38506

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