An issue was discovered in certain Apple products. iOS before 10.1 is affected. macOS before 10.12.1 is affected. tvOS before 10.0.1 is affected. watchOS before 3.1 is affected. The issue involves the "libarchive" component, which allows remote attackers to write to arbitrary files via a crafted archive containing a symlink.
https://support.apple.com/HT207275
https://support.apple.com/HT207271
https://support.apple.com/HT207270
https://support.apple.com/HT207269