Debian ftpsync before 20171017 does not use the rsync --safe-links option, which allows remote attackers to conduct directory traversal attacks via a crafted upstream mirror.Referenceshttp://www.openwall.com/lists/oss-security/2017/10/17/2https://lists.debian.org/debian-mirrors/2017/10/msg00017.htmlhttps://anonscm.debian.org/cgit/mirror/archvsync.git/commit/?id=d1ca2ab2210990b6dfb664cd6776a41b71c48016
