Security Over 6,000 Redis Database Servers Ready for the Taking

Also another reason why a firewall is needed like CSF Firewall which is installed by Centmin Mod out of the box.

from A few things about Redis security - <antirez> posted 249+ days ago

Redis Security – Redis

 

and New security feature: Redis protected mode. : redis

 

I believe out of box the difference is redis does not bind to 127.0.0.1 unless you enable it in redis.conf while memcached out of box binds to 127.0.01

 

i believe redis.conf does now though http://download.redis.io/redis-stable/redis.conf ?

or it's a redis 3.2+ thing

Code (Text):

################################## NETWORK #####################################

# By default, if no "bind" configuration directive is specified, Redis listens
# for connections from all the network interfaces available on the server.
# It is possible to listen to just one or multiple selected interfaces using
# the "bind" configuration directive, followed by one or more IP addresses.
#
# Examples:
#
# bind 192.168.1.100 10.0.0.1
# bind 127.0.0.1 ::1
#
# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the
# internet, binding to all the interfaces is dangerous and will expose the
# instance to everybody on the internet. So by default we uncomment the
# following bind directive, that will force Redis to listen only into
# the IPv4 lookback interface address (this means Redis will be able to
# accept connections only from clients running into the same computer it
# is running).
#
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
# JUST COMMENT THE FOLLOWING LINE.
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bind 127.0.0.1

# Protected mode is a layer of security protection, in order to avoid that
# Redis instances left open on the internet are accessed and exploited.
#
# When protected mode is on and if:
#
# 1) The server is not binding explicitly to a set of addresses using the
#    "bind" directive.
# 2) No password is configured.
#
# The server only accepts connections from clients connecting from the
# IPv4 and IPv6 loopback addresses 127.0.0.1 and ::1, and from Unix domain
# sockets.
#
# By default protected mode is enabled. You should disable it only if
# you are sure you want clients from other hosts to connect to Redis
# even if no authentication is configured, nor a specific set of interfaces
# are explicitly listed using the "bind" directive.
protected-mode yes

 

checking an old copy of my redis 2.8.7 epel installed redis.conf and bind is enabled too

Code (Text):

# By default Redis listens for connections from all the network interfaces
# available on the server. It is possible to listen to just one or multiple
# interfaces using the "bind" configuration directive, followed by one or
# more IP addresses.
#
# Examples:
#
# bind 192.168.1.100 10.0.0.1
bind 127.0.0.1

So problem that article was suggesting is probably folks who need remote redis server access are disabling bind to 127.0.0.1 and just leaving redis port and server wide open instead of properly firewalling their redis server which is what Redis Security – Redis is outlining

CSF Firewall has advanced features to just whitelist a specific ip on a specific port CSF - CSF Firewall info | Centmin Mod Community

i.e.
# TCP connections inbound to port 6379 on redis server from IP 11.22.33.44 web server. Add to /etc/csf.allow

Code (Text):

tcp|in|d=6379|s=11.22.33.44

and then restart csf firewall

Code (Text):

csf -r

 

yeah bind + csf firewall