CVE-2019-9811

Name of the Vulnerable Software and Affected Versions Firefox ESR versions prior to 60.8 Firefox versions prior to 68 Thunderbird versions prior to 60.8

Description The issue is related to insufficient access control in Firefox ESR, Firefox, and the Thunderbird email client. It can be exploited by a remote attacker to cause a denial of service by loading a malicious language pack. A researcher demonstrated a sandbox escape by installing a malicious language pack and then opening a browser feature that used the compromised translation.

Recommendations For Firefox ESR versions prior to 60.8, update to version 60.8 or later to resolve the issue. For Firefox versions prior to 68, update to version 68 or later to resolve the issue. For Thunderbird versions prior to 60.8, update to version 60.8 or later to resolve the issue. As a temporary workaround, consider restricting the installation of language packs to minimize the risk of exploitation.