A flaw in Thunderbird's implementation of iCal causes a type confusion in icaltimezone_get_vtimezone_properties when processing certain email messages, resulting in a crash. This vulnerability affects Thunderbird < 60.7.1.Referenceshttps://www.mozilla.org/security/advisories/mfsa2019-17/https://bugzilla.mozilla.org/show_bug.cgi?id=1555646https://security.gentoo.org/glsa/201908-20
