High Threat Security Alert (A20-04-01): Multiple Vulnerabilities in Firefox

Description:

Mozilla has published the security advisory (MFSA 2020-11) to address the use-after-free 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.

Reports indicate that active exploitation against two critical vulnerabilities (CVE-2020-6819, CVE-2020-6820) for remote code execution have been observed. System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

Affected Systems:

• Firefox prior to version 74.0.1
• Firefox ESR prior to version 68.6.1

Impact:

Successful exploitation of the vulnerabilities could lead to arbitrary code execution 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 74.0.1 for Windows, Macintosh and Linux
  https://www.mozilla.org/en-US/firefox/all/
  
  
• Firefox ESR 68.6.1 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/mfsa2020-11/
https://www.hkcert.org/my_url/en/alert/20040601
https://www.us-cert.gov/ncas/current-activity/2020/04/03/mozilla-patches-critical-vulnerabilities-firefox-firefox-esr
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6819
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6820