'The Redis security model is: “it’s totally insecure to let untrusted clients access the system, please protect it from the outside world yourself”.' -- http://antirez.com/news/96

That blog post also helpfully shows how to write you own key into .ssh/authorized_keys to you can log in as the redis user over ssh. From there use your favourite lunar priv escalation bug to p0wn the box completely. (Or just run your cryptominer as the redis user...)

Note: that's about 5 years old now...