I wrote another post for the Milton Security blog on the CVE-2017-7494 Samba exploit, which affects Linux machines running Samba 3.5.0 – 4.5.4/4.5.10/4.4.14. This also includes NAS devices that many people do not patch regularly. In the blog post i talked about what Samba is and how it has been vulnerable for the last 7 years due to this bug. I also go over on how to test/ exploit your machine to see if you’re vulnerable. I also cover some mitigations, the maintainers of the Samba project have provided a patch so I would advise you install it as soon as possible, some NAS firmware upgrades have been available from Netgear and Synology already.
Below is a demonstration of how easy it is to gain access on a vulnerable machine.