rsync versions 2.6.2 and below have a flaw that allows malicious users to read or write arbitrary files on a vulnerable system. In order to exploit this vulnerability, the rsync daemon cannot be running in a chroot.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34062/rsync.nochroot.html
Source: https://packetstormsecurity.com/files/34062/rsync.nochroot.html.html