Skip to content
Sudonix

How to restrict external access to Redis instance installed in a docker image

Solved Configure
8 3 5.0k 1
  • WesleyMoura
    WesleyMoura
    WesleyMoura
    wrote on
    #1

    Hello, I’m receiving an email, about my server that has a docker image of redis installed and uses port 6379, saying that it is open to external connections.

    Redis listens for traffic from everywhere on port 6379, and you can validate this report by attempting to connect to your Redis on 6379 via a simple telnet command:

    telnet 111.111.111.111 6379

    This is a part of the email, (I masked the IP to put the message here on the forum) I also did the test to see if the port is really open to external connections on the website, https://www.yougetsignal.com /tools/open-ports/ , and it actually shows that my server’s ip port 6379 is open. And the email says to do the following

    Remediation of this issue will take just a few minutes and is relatively straightforward. You will need to open /etc/redis/redis.conf and uncomment (remove the “#”) or modify the line beginning with:

    #bind 127.0.0.1 ::1

    Afterwards, restart redis with:

    sudo systemctl restart redis

    I would like to know if someone can help me, since I can’t access the redis.config file inside the server, because redis is in a docker image, or at least I don’t know how to access it. Is there any way to block external access to my redis installed by a docker image?

    1
  • phenomlab phenomlab

    @WesleyMoura any update ?

    WesleyMoura
    WesleyMoura
    WesleyMoura
    wrote on
    #8

    @phenomlab
    Sorry to delay in responding, yes as i mentioned above, i had to remove my redis from docker and reinstall a new image with this command

    docker run --name=redis -p 127.0.0.1:6379:6379 -d -t redis:alpine

    and now when i test my ip and port on
    https://www.yougetsignal.com/tools/open-ports/

    the status of my redis port is closed. I think which to configure firewall in droplet digital ocean is a good idea too, and i will configure soon.
    Thanks for the help!

    0
  • WesleyMoura WesleyMoura

    Hello, I’m receiving an email, about my server that has a docker image of redis installed and uses port 6379, saying that it is open to external connections.

    Redis listens for traffic from everywhere on port 6379, and you can validate this report by attempting to connect to your Redis on 6379 via a simple telnet command:

    telnet 111.111.111.111 6379

    This is a part of the email, (I masked the IP to put the message here on the forum) I also did the test to see if the port is really open to external connections on the website, https://www.yougetsignal.com /tools/open-ports/ , and it actually shows that my server’s ip port 6379 is open. And the email says to do the following

    Remediation of this issue will take just a few minutes and is relatively straightforward. You will need to open /etc/redis/redis.conf and uncomment (remove the “#”) or modify the line beginning with:

    #bind 127.0.0.1 ::1

    Afterwards, restart redis with:

    sudo systemctl restart redis

    I would like to know if someone can help me, since I can’t access the redis.config file inside the server, because redis is in a docker image, or at least I don’t know how to access it. Is there any way to block external access to my redis installed by a docker image?

    phenomlab
    phenomlab
    phenomlab
    wrote on
    #2

    @WesleyMoura Hi, and welcome to Sudonix. Even with Redis installed in a docker image, you will still have a config file, and should still be able to reach it.

    Can you provide more detail about the docket image ? You are right - by default, Redis will listen on all addresses, and will be exposed to the internet. Another way around this is to block access at firewall level and only permit the hosts you actually want.

    Mark Cutting also advises organisations as a Fractional CIO, Fractional CISO and Executive Advisor, helping boards improve technology governance, cyber resilience and executive decision making. Learn more at Gratmore Ltd

    0
  • phenomlab phenomlab

    @WesleyMoura Hi, and welcome to Sudonix. Even with Redis installed in a docker image, you will still have a config file, and should still be able to reach it.

    Can you provide more detail about the docket image ? You are right - by default, Redis will listen on all addresses, and will be exposed to the internet. Another way around this is to block access at firewall level and only permit the hosts you actually want.

    WesleyMoura
    WesleyMoura
    WesleyMoura
    wrote on
    #3

    @phenomlab Hello, i have installed my redis on docker with this comand,
    docker run --name redis -p 6379:6379 -d -t redis:alpine
    And i don’t know how to access the redis.conf on docker image to make this step cited in email.
    Do you know how to do?
    I’m trying to search on documentation but i still can’t find it.

    phenomlab 2 Replies
    0
  • WesleyMoura WesleyMoura

    @phenomlab Hello, i have installed my redis on docker with this comand,
    docker run --name redis -p 6379:6379 -d -t redis:alpine
    And i don’t know how to access the redis.conf on docker image to make this step cited in email.
    Do you know how to do?
    I’m trying to search on documentation but i still can’t find it.

    phenomlab
    phenomlab
    phenomlab
    wrote on
    #4

    @WesleyMoura Is it located in /usr/local/etc/redis/redis.conf ?

    Also, have a look at this

    https://hub.docker.com/_/redis

    Mark Cutting also advises organisations as a Fractional CIO, Fractional CISO and Executive Advisor, helping boards improve technology governance, cyber resilience and executive decision making. Learn more at Gratmore Ltd

    0
  • Hari
    Hari
    Hari
    wrote on
    #5

    6a81d494-bcc6-404d-8f2a-bef1e530314d-image.png

    Hello Wesley, i am doing great thanks for asking.

    actually, i am using digital ocean droplet with Plesk + Redis with docker

    i followed this guide and it solved the issue https://talk.plesk.com/threads/plesk-docker-redis-plesk-firewall-open-port-issue.352324/

    we need to install Redis docker using Plesk store BUT should run it using a specific command that limits its access to the local host only. (in your case you will install redis using command)

    Start the docker with,

    docker run --name=redis -p 127.0.0.1:6379:6379 redis

    d488b58b-e427-4c4e-9003-55ee1e1b35f9-image.png

    not sure this helps you or not but play with above command 😄

    WesleyMoura 1 Reply
    2
  • WesleyMoura WesleyMoura

    @phenomlab Hello, i have installed my redis on docker with this comand,
    docker run --name redis -p 6379:6379 -d -t redis:alpine
    And i don’t know how to access the redis.conf on docker image to make this step cited in email.
    Do you know how to do?
    I’m trying to search on documentation but i still can’t find it.

    phenomlab
    phenomlab
    phenomlab
    wrote on
    #6

    @WesleyMoura any update ?

    Mark Cutting also advises organisations as a Fractional CIO, Fractional CISO and Executive Advisor, helping boards improve technology governance, cyber resilience and executive decision making. Learn more at Gratmore Ltd

    WesleyMoura 1 Reply
    0
  • Hari Hari

    6a81d494-bcc6-404d-8f2a-bef1e530314d-image.png

    Hello Wesley, i am doing great thanks for asking.

    actually, i am using digital ocean droplet with Plesk + Redis with docker

    i followed this guide and it solved the issue https://talk.plesk.com/threads/plesk-docker-redis-plesk-firewall-open-port-issue.352324/

    we need to install Redis docker using Plesk store BUT should run it using a specific command that limits its access to the local host only. (in your case you will install redis using command)

    Start the docker with,

    docker run --name=redis -p 127.0.0.1:6379:6379 redis

    d488b58b-e427-4c4e-9003-55ee1e1b35f9-image.png

    not sure this helps you or not but play with above command 😄

    WesleyMoura
    WesleyMoura
    WesleyMoura
    wrote on
    #7

    @Hari said in How to restrict external access to Redis instance installed in a docker image:

    Hello Hari, sorry my delay in responding, but i already solved this problem, using exactly this command that you mentioned, docker run --name=redis -p 127.0.0.1:6379:6379 -d -t redis:alpine, in my case. But as i already had one image of redis, i had to remove the current redis from my docker and reinstall using this comand. Now when i test the port on https://www.yougetsignal.com/tools/open-ports/ with my ip and port of redis, the status of port is closed now. And now i just have to configure my firewall wich i will soon.
    So thanks to answer me and sorry again to delay in responding.

    1
  • phenomlab phenomlab

    @WesleyMoura any update ?

    WesleyMoura
    WesleyMoura
    WesleyMoura
    wrote on
    #8

    @phenomlab
    Sorry to delay in responding, yes as i mentioned above, i had to remove my redis from docker and reinstall a new image with this command

    docker run --name=redis -p 127.0.0.1:6379:6379 -d -t redis:alpine

    and now when i test my ip and port on
    https://www.yougetsignal.com/tools/open-ports/

    the status of my redis port is closed. I think which to configure firewall in droplet digital ocean is a good idea too, and i will configure soon.
    Thanks for the help!

    0
  • phenomlab phenomlab has marked this topic as solved on
Log in to reply

Did this solution help you?
Did you find the suggested solution useful? Support 💗 Sudonix with a coffee ☕
If your organisation needs deeper expertise around infrastructure, security, or technology leadership, learn more about Phenomlab Ltd. Many of the deeper technical guides behind Sudonix are published there.

Related Topics
  • veronikya

    mongodb replica set

    Configure mongodb docker ansible
    11
    2 Votes
    11 Posts
    4k Views
    phenomlab
    @veronikya said in mongodb replica set: The host’s local dns resolution is not configured. The problem of the host’s hosts being unable to be resolved in docker has been solved. Surprisingly Solution: Edit the /etc/resovel.conf file Add 127.0.0.53 One immediate issue I can think of here is that editing resolv.conf directly is no longer supported and not recommended (because the changes do not survive a reboot) - unless you install the resolvconf package?
  • DownPW

    Setting for high load and prevent DDoS (sysctl, iptables, crowdsec or other)

    Security security server kernel ddos iptables
    4
    0 Votes
    4 Posts
    2k Views
    phenomlab
    @DownPW most of this really depends on your desired security model. In all cases with firewalls, less is always more, although it’s never as clear cut as that, and there are always bespoke ports you’ll need to open periodically. Heztner’s DDoS protection is superior, and I know they have invested a lot of time, effort, and money into making it extremely effective. However, if you consider that the largest ever DDoS attack hit Cloudflare at 71m rps (and they were able to deflect it), and each attack can last anywhere between 8-24 hours which really depends on how determined the attacker(s) is/are, you can never be fully prepared - nor can you trace it’s true origin. DDoS attacks by their nature (Distributed Denial of Service) are conducted by large numbers of devices whom have become part of a “bot army” - and in most cases, the owners of these devices are blissfully unaware that they have been attacked and are under command and control from a nefarious resource. Given that the attacks originate from multiple sources, this allows the real attacker to observe from a distance whilst concealing their own identity and origin in the process. If you consider the desired effect of DDoS, it is not an attempt to access ports that are typically closed, but to flood (and eventually overwhelm) the target (such as a website) with millions of requests per second in an attempt to force it offline. Victims of DDoS attacks are often financial services for example, with either extortion or financial gain being the primary objective - in other words, pay for the originator to stop the attack. It’s even possible to get DDoS as a service these days - with a credit card, a few clicks of a mouse and a target IP, you can have your own proxy campaign running in minutes which typically involves “booters” or “stressers” - see below for more https://heimdalsecurity.com/blog/ddos-as-a-service-attacks-what-are-they-and-how-do-they-work @DownPW said in Setting for high load and prevent DDoS (sysctl, iptables, crowdsec or other): in short if you have any advice to give to secure the best. It’s not just about DDos or firewalls. There are a number of vulnerabilities on all systems that if not patched, will expose that same system to exploit. One of my favourite online testers which does a lot more than most basic ones is below https://www.immuniweb.com/websec/ I’d start with the findings reported here and use that to branch outwards.
  • phenomlab

    Secure SSH connectivty

    Security ssh keys security
    7
    6 Votes
    7 Posts
    3k Views
    DownPW
    @phenomlab yep but I use it since several month and I haven’t see any bugs or crash In any case, I only use him anymore Tabby offers tabs and a panel system, but also themes, plugins and color palettes to allow you to push the experience to the limit. It can support different shells in the same window, offers completion, has an encrypted container for your passwords, SSH keys and other secrets, and can handle different connection profiles. Each tab is persistent (you can restore them if you close one by mistake) and has a notification system, which will let you know if, for example, a process is finished while you are tapping in another tab. It’s really a great terminal that will easily replace cmd.exe for Windowsians or your usual terminal. And it can even work in a portable version for those who like to carry their tools on a USB key. –> To test it, you can download it, but there is also a web version. Handy for getting an idea. https://app.tabby.sh
  • Hari

    Virtualmin Setup DigitalOcean

    Solved Customisation virtualmin digitalocean
    26
    9 Votes
    26 Posts
    13k Views
    phenomlab
    @Hari said in Virtualmin Setup DigitalOcean: i have felt it is very hard to manage Virtualmin the settings are confusing It’s a bit of a learning curve, admittedly, but very powerful and easy to use provided you understand the implications of what you are doing. For example, moving a VirtualMin server to subserver and then back again without changing underlying components that rely on the correct placement of the server, of course it will no longer work.
  • DownPW

    Windscribe VPN offered for free with a lifetime license

    General security vpn
    6
    3
    5 Votes
    6 Posts
    3k Views
    phenomlab
    Missed out on this deal ? Windscribe offer a limited free version. More about that here https://sudonix.org/topic/13/which-product-is-the-best-for-vpn/164?_=1652206628456
  • Hari

    installing flarum with plesk

    Solved Configure flarum
    78
    26 Votes
    78 Posts
    39k Views
    Hari
    @phenomlab thanks a lot, have a nice day
  • Mike Jones

    Securing javascript -> PHP mysql calls on Website

    Solved Security php mysql security
    2
    1 Votes
    2 Posts
    2k Views
    phenomlab
    @mike-jones Hi Mike, There are multiple answers to this, so I’m going to provide some of the most important ones here JS is a client side library, so you shouldn’t rely on it solely for validation. Any values collected by JS will need to be passed back to the PHP backend for processing, and will need to be fully sanitised first to ensure that your database is not exposed to SQL injection. In order to pass back those values into PHP, you’ll need to use something like <script> var myvalue = $('#id').val(); $(document).ready(function() { $.ajax({ type: "POST", url: "https://myserver/myfile.php?id=" + myvalue, success: function() { $("#targetdiv").load('myfile.php?id=myvalue #targetdiv', function() {}); }, //error: ajaxError }); return false; }); </script> Then collect that with PHP via a POST / GET request such as <?php $myvalue= $_GET['id']; echo "The value is " . $myvalue; ?> Of course, the above is a basic example, but is fully functional. Here, the risk level is low in the sense that you are not attempting to manipulate data, but simply request it. However, this in itself would still be vulnerable to SQL injection attack if the request is not sent as OOP (Object Orientated Programming). Here’s an example of how to get the data safely <?php function getid($theid) { global $db; $stmt = $db->prepare("SELECT *FROM data where id = ?"); $stmt->execute([$theid]); while ($result= $stmt->fetch(PDO::FETCH_ASSOC)){ $name = $result['name']; $address = $result['address']; $zip = $result['zip']; } return array( 'name' => $name, 'address' => $address, 'zip' => $zip ); } ?> Essentially, using the OOP method, we send placeholders rather than actual values. The job of the function is to check the request and automatically sanitise it to ensure we only return what is being asked for, and nothing else. This prevents typical injections such as “AND 1=1” which of course would land up returning everything which isn’t what you want at all for security reasons. When calling the function, you’d simply use <?php echo getid($myvalue); ?> @mike-jones said in Securing javascript -> PHP mysql calls on Website: i am pretty sure the user could just use the path to the php file and just type a web address into the search bar This is correct, although with no parameters, no data would be returned. You can actually prevent the PHP script from being called directly using something like <?php if(!defined('MyConst')) { die('Direct access not permitted'); } ?> then on the pages that you need to include it <?php define('MyConst', TRUE); ?> Obviously, access requests coming directly are not going via your chosen route, therefore, the connection will die because MyConst does not equal TRUE @mike-jones said in Securing javascript -> PHP mysql calls on Website: Would it be enough to just check if the number are a number 1-100 and if the drop down is one of the 5 specific words and then just not run the rest of the code if it doesn’t fit one of those perameters? In my view, no, as this will expose the PHP file to SQL injection attack without any server side checking. Hope this is of some use to start with. Happy to elaborate if you’d like.
  • phenomlab

    Changing Passwords Regularly Actually Weakens Security

    Blog security blog
    1
    1
    0 Votes
    1 Posts
    2k Views
    No one has replied