Arbitrary Code Execution via Unsanitized app.support.baseURL Preference in Firefox < 59

CVE-2018-5133 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:N/A:N

If the "app.support.baseURL" preference is changed by a malicious local program to contain HTML and script content, this content is not sanitized. It will be executed if a user loads "chrome://browser/content/preferences/in-content/preferences.xul" directly in a tab and executes a search. This stored preference is also executed whenever an EME video player plugin displays a CDM-disabled message as a notification message. This vulnerability affects Firefox < 59.

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