Gentoo Linux Security Announcement 200312-01 – On December 2nd, the rsync.gentoo.org server was compromised via a heap overflow in the rsync 2.56 server implementation.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/32317/gentoo.200312-01.txt
Source: https://packetstormsecurity.com/files/32317/gentoo.200312-01.txt.html