AppleTalk is a networking protocol, similar to TCP/IP. AppleTalk was deprecated in Mac OS X, and removed in Mac OS X 10.6.Just because Netatalk is an implementation of the AppleTalk protocol doesn't mean AppleTalk itself and Macs are vulnerable. Didn't I read that AppleTalk has been deprecated? Which doesn't mean it is gone from the latest OS version, and many of us are on older ones.
All I knew to do at the moment was disable AFP (Apple Filing Protocol) on my Synologies. I presume the patch that's already in Debian will be delivered soon by Synology.
AppleShare (AFP) is a file sharing protocol (similar to SMB or NFS). It initially ran exclusively over an AppleTalk network, but TCP/IP support was added with AppleShare IP around the time of Mac OS 7.6. AppleShare over IP has persisted until today, even through it is currently deprecated.
Netatalk is an open-source implementation of both the AppleTalk protocol and an AFP server (and other services). The vulnerability cited is specific to netatalk's AppleTalk implementation. Disabling the AFP server on your Synologies did nothing to address the vulnerability in the AppleTalk network stack.
No one really runs AppleTalk networks anymore, right? It's been about 20 years since I've seen one. I can't imagine it's enabled by default, and if you do have it on, there's probably no reason to.