A vulnerability can occur when capturing a media stream when the media source type is changed as the capture is occurring. This can result in stream data being cast to the wrong type causing a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.
https://www.mozilla.org/security/advisories/mfsa2018-19/
https://www.mozilla.org/security/advisories/mfsa2018-17/
https://www.mozilla.org/security/advisories/mfsa2018-16/
https://www.mozilla.org/security/advisories/mfsa2018-15/
https://www.debian.org/security/2018/dsa-4295
https://www.debian.org/security/2018/dsa-4235
https://usn.ubuntu.com/3705-1/
https://security.gentoo.org/glsa/201811-13
https://security.gentoo.org/glsa/201810-01
https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
https://lists.debian.org/debian-lts-announce/2018/06/msg00014.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1453127
https://access.redhat.com/errata/RHSA-2018:2113
https://access.redhat.com/errata/RHSA-2018:2112