Description:

Mozilla has published two security advisories (MFSA 2020-42 and MFSA 2020-43) to address multiple vulnerabilities in Firefox browser.  A remote attacker could entice a user running a vulnerable browser to visit a web page with specially crafted content to exploit the vulnerabilities.

Affected Systems:

• Firefox ESR prior to version 78.3
• Firefox prior to version 81

Impact:

Successful exploitation of the vulnerabilities could lead to arbitrary code execution, cross site scripting, spoofing or application crash on an affected system.

Recommendation:

Mozilla has released new versions of the product to address the issues and they can be downloaded at the following URLs:

• Firefox 81 for Windows, Macintosh and Linux
  https://www.mozilla.org/en-US/firefox/all/
  
  
• Firefox ESR 78.3 for Windows, Macintosh and Linux
  https://www.mozilla.org/en-US/firefox/organizations/all/
  
  

Users of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk.

More Information:

https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/
https://www.mozilla.org/en-US/security/advisories/mfsa2020-43/
https://www.hkcert.org/my_url/en/alert/20092302
https://us-cert.cisa.gov/ncas/current-activity/2020/09/22/mozilla-releases-security-updates-firefox-and-firefox-esr
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15673 (to CVE-2020-15678)