Security Alert (A21-09-05): Multiple Vulnerabilities in Firefox

Description:

Mozilla has published the advisories (MFSA2021-38, MFSA2021-39 and MFSA2021-40) 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 Windows versions prior to version 78.14
• Firefox ESR Windows versions prior to version 91.1
• Firefox Windows versions prior to version 92

Impact:

Successful exploitation of the vulnerabilities could lead to arbitrary code execution, denial of service or security restriction bypass 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 92 for Windows
  https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
• Firefox ESR 78.14 and 91.1 for Windows
  https://www.mozilla.org/en-US/firefox/all/#product-desktop-esr

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/mfsa2021-38/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-39/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-40/
• https://www.hkcert.org/security-bulletin/mozilla-firefox-multiple-vulnerabilities_20210908
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29993
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38491 (to CVE-2021-38495)