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The The Restaurant at the Edge of the Universe, previously known as The Water Cooler, is a place to post stuff that has absolutely nothing at all to do with computers, broadband, Scot's Newsletter, or anything that's "supposed" to be here.
I predict that will be fixed before you can count to Jack Robinson.
No VPN here, and no "loose" setting in sysctl.conf either. I didn't see a way in either of those articles to actually test vulnerability.
There is a setting commented out which is said to mitigate this if you uncomment:
# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks
Hehehe! I know EXACTLY what you mean. Unfortunately, purists are not unique to Debian. But Debian is somewhat unique (IMO) for the lengths they go to in order to discourage users from creating "FrankenDebians" with unsupported packages. I hope your VirtualBox package works as expected, for the life of your Debian install. And it probably will...until it doesn't; and when/if that happens the Debian forums will let you know in no uncertain terms that you assumed the risk, despite their warnings, and you're on your own.
Might wanna bookmark this thread, or the virtual machine manager link, in case you ever need to revisit this. JMO...
FWIW, I'm always amazed how most Linux users tout that there's "more than 1 way to solve a problem"; but then the "purists" inform you there's ONE "correct" way before smugly walking away. Which one is it?! SMH... I've always thought solutions were of a good/better/best variety. If you accomplish what was intended, it's a good solution. Perhaps it could be better, perhaps not. And the best solutions address all user-case scenarios, in all situations, with no additional interference. JMO...