JavaScript in the `about:webrtc` page is not sanitized properly being being assigned to `innerHTML`. Data on this page is supplied by WebRTC usage and is not under third-party control, making this difficult to exploit, but the vulnerability could possibly be used for a cross-site scripting (XSS) attack. External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/#CVE-2017-7799 Acknowledgements: Name: the Mozilla project Upstream: Frederik Braun