NextDns Config id too easily bruteforced
The config id is only 6 alphanumerical long. It is too easily bruteforced. Config id should be at least 12 characters long. What do you think?
16 replies
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I don't think anyone logical would use another person's config. They don't control what they're using and the owner of the profile can see their IP.
The person would either annoy or be spied upon by the owner so in any logic a person trying to be private is going to lose all privacy if they go that route.
Tere are also other deterrences in place, you can use the service for free without any limits if you don't want filtering or you can use it for free upto 300k queries. The pricing structure is also meant to be affordable for most people.
Overall yeah since it's 6 digits, it could be done but in all senses of logic it's not worth it.
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With 36 choices for each character and 6 characters, that winds up being 36^6 or 2,176,782,336 possibilities - all to use someone else's configuration - with no guarantee that it's even an active profile.
Though, it would be a great milestone for NextDNS if they reached that number and had to increase the character set for users.
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Once you find 1 config from a emailacc, you would generally find the rest. Right? am I wrong?
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If one had a supercomputer is it possible to get someones config in a few days?
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Once you get sommeones config, is it possible for the attacker to launch commands and find out about critical things? Tell me if that is possible?
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Asser once you get someones config you'd be spied on by then if they have their logs enabled using whatever settings they have without any control.
At that point using one of the free Adblocking DNS services without any customization is a lot better since you won't be showing up on a different users logs. It's literally the worst decision to make by a "hacker" aka someone using basic tools.
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Hey so is it basically in a read only state for the attacker? Correct me if I am wrong. So commands cannot be launched from the attacker end and even if it is launched nothing critical or valuable can be used to exploit end to end communications. If so wow isn't that basically impressive? Is that right?
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Asser It would be hard for someone to find a person's ID, it would simply be an active Configuration profile and all that'll lead to is them getting access to NextDNS servers through your behalf, using your account aka leeching off someone. The only access is that, that ability to use your profile and settings not access or change them but simply use the profile.
If someone tries to brute an account through, that would be a different story, most people use 2FA and also are people who care about privacy, so I would expect most people to have good security. There are more than likely security measures already to prevent things like bruting either way.
So the worse case is, some person has their personal info on someones account when they could have used a free account or pay for the service.
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Hey I understand now. But what if the attacker is hell bent on doing some nasty ddos attack on the server? I do not know how Ddos works but if I may ask is that possible?
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Asser Their servers would absorb the DDOS just fine.
Back when Facebook/Instagram had a huge issue where their records were removed and global DNS usage increased by a lot where Adguard and some ISP DNS servers went down globally. NextDNS staff stated that yeah they had an increase but that they can handle far more than that.
So a simple DDOS wouldn't just take the servers down as there is a huge network, it's from my knowledge by server size the second largest from what I've seen.
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Hey I understand now. Thanksyou. I have one more question, is it more vulnerable on mobile phones than on pc?
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Asser I don't understand that question, there shouldn't be any vulnerabilities by using NextDNS. You always use DNS it's either the Carrier/ISPs DNS or NextDNS that can block ads and respects privacy and is far better than their DNS.
Basically every time you visit a website by going to a URL, you use a DNS service that connects you to the right server. Without it, you'd have to manually type in all the website IPs.
So you don't become vulnerable by using NextDNS as it does the same job as the ISP, it just monitors and configures your DNS to make it better.
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Hey Alright I understand now. Thankyou. I am only asking about it because I am getting more downtime on my mobile compared to my pc. The downtime usually last from 20mins to 30mins. Which makes me question alot of stuff. Thankyou for your help.
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Hey Besides I don't get any downtime when I am using my pc.
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Content aside
- 2 yrs agoLast active
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