Haik Aftandilian

**Name of the Vulnerable Software and Affected Versions** Thunderbird versions prior to 52.1 Firefox ESR versions prior to 52.1 Firefox versions prior to 53 **Description** The issue allows for bypassing file system access protections in the sandbox, enabling read-only access to the local file system through the use of relative paths in the file picker. This can potentially allow a remote attacker to access protected information. **Recommendations** For Thunderbird versions prior to 52.1, update to version 52.1 or later. For Firefox ESR versions prior to 52.1, update to version 52.1 or later. For Firefox versions prior to 53, update to version 53 or later.

Name of the Vulnerable Software and Affected Versions: Firefox versions prior to 52 Thunderbird versions prior to 52 Description: The Gecko Media Plugin sandbox has an issue that allows access to local files matching specific regular expressions. On OS X, this could expose personal or temporary data in subdirectories of "/private/var". The issue has been updated to restrict access to "/private/var" and its subdirectories. This issue only affects OS X, with other operating systems not being affected. Recommendations: For Firefox versions prior to 52, update to version 52 or later to resolve the issue. For Thunderbird versions prior to 52, update to version 52 or later to resolve the issue.