The Resource Timing API incorrectly revealed navigations in cross-origin iframes. This is a same-origin policy violation and could allow for data theft of URLs loaded by users. This vulnerability affects Firefox < 57, Firefox ESR < 52.5, and Thunderbird < 52.5.
https://www.mozilla.org/security/advisories/mfsa2017-26/
https://www.mozilla.org/security/advisories/mfsa2017-25/
https://www.mozilla.org/security/advisories/mfsa2017-24/
https://www.debian.org/security/2017/dsa-4075
https://www.debian.org/security/2017/dsa-4061
https://www.debian.org/security/2017/dsa-4035
https://lists.debian.org/debian-lts-announce/2017/12/msg00001.html
https://lists.debian.org/debian-lts-announce/2017/11/msg00018.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1408990
https://access.redhat.com/errata/RHSA-2017:3372
https://access.redhat.com/errata/RHSA-2017:3247