rsync 3.1.3-development before 2017-10-24 mishandles archaic checksums, which makes it easier for remote attackers to bypass intended access restrictions. NOTE: the rsync development branch has significant use beyond the rsync developers, e.g., the code has been copied for use in various GitHub projects.
https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=c252546ceeb0925eb8a4061315e3ff0a8c55b48b
https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=9a480deec4d20277d8e20bc55515ef0640ca1e55
https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=7b8a4ecd6ff9cdf4e5d3850ebf822f1e989255b3