HTTP: Mozilla Firefox WebExtensions SettingContent-ms Policy Bypass

This signature detects attempt to exploit a policy bypass vulnerability which has been reported in Mozilla Firefox. A remote attacker could exploit this vulnerability by enticing the target user to open a specially crafted web page. Successful exploitation could allow the attacker to execute arbitrary commands.

Extended Description

Windows 10 does not warn users before opening executable files with the SettingContent-ms extension even when they have been downloaded from the internet and have the "Mark of the Web." Without the warning, unsuspecting users unfamiliar with this new file type might run an unwanted executable. This also allows a WebExtension with the limited downloads.open permission to execute arbitrary code without user interaction on Windows 10 systems. *Note: this issue only affects Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

References

CVE: CVE-2018-12368

Short Name

HTTP:FIREFOX-WEBEXT-RCE

Severity

Major

Recommended

True

Recommended Action

Drop

HTTP: Mozilla Firefox WebExtensions SettingContent-ms Policy Bypass

Extended Description

References

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