The Domain Name System (DNS) translates Internet domain and host names to IP addresses.

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Questions regarding DNSSEC

Until now I understood the following about DNSSEC: A client requests a certain Domain let's say google.se The root server sends the client his public KSK and public ZSK signed by his private KSK so ...
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DNSSEC ZSK compromisation (man-in-the-middle attack)

Assuming I am administering a DNS zone and I operate an authoritative name server that is secured with DNSSEC (split ZSK/KSK setup). When the Zone-Signing-Key (ZSK) ever gets compromised, would it be ...
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How does DNS-based Authentication of Named Entities (DANE) work?

How does DNS-based Authentication of Named Entities (DANE) work? If I'm correct it depends on a valid DNSSEC configuration (Domain Name System Security Extensions)? But what does it do and how does it ...
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Are two DNS MX records pointing to the same IP a availability risk (single point of failure)?

Are two DNS MX records pointing to the same IP a availability risk as in a single point of failure (SPOF)? Even if there are three DNS MX records in total for example: mx1.example.com 192.168.1.1 ...
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Should I worry about GitHub using IP addresses that are described as having an unknown host?

Today, I got a message while doing a git push, saying Warning: Permanently added the RSA host key for IP address '192.30.253.112' to the list of known hosts. It seems as if it's consistent with ...
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Is it a security risk, lack of knowledge for reactive action, when abuse mail is rejected?

When inspecting the DNS configuration for example with dnsinspect.com, the following shows up sometimes (note I used example.com): Accepts Abuse Address WARNING: Found mail servers which are not ...
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My ISP provider is spoofing DNS [on hold]

My ISP provider is DNS spoofing OpenDNS, Google DNS, Norton DNS, Yandex DNS and all other known DNS servers. So even if I use those, I still can't access some websites. So I need a DNS server which is ...
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Do I need to use DNScrypt, or can I just set up DNS by myself? What's the point?

So I'm not a fan of having lots of software on my PC, and I was thinking: do I actually need to use DNSCrypt or can I just type in DNS address of one of those private DNS services which do not log ...
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63 views

Blind SQL Injection using OOB DNS Practical Sniffing Help

I was looking at Excellent Article from Defcon 15's which was Data retrieval over DNS during SQL Injection Attacks. (https://www.youtube.com/watch?v=iQDw0hK_eFw). In this the speaker demonstrated the ...
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Risks of publicly available zone transfer [duplicate]

I just realized that one of the domain registrars we're using does not restrict zone transfers, it's available for everyone. I read that it's a bad practice, but what are the real security concerns ...
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Using Single Domain Name to Identify Multiple Servers Improves Security? (Google's use of 1e100.net)

Since 2009, Google has been using a single domain name to identify its servers across multiple products: Following standard industry practice, we make sure each IP address has a corresponding ...
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How two identical domains work on Internet when they got signed from two different CA

Let's say A and B. Considering A and B are from same location. A went to the verisign and get signed for example.com B went to the godaddy.com and get signed for same domain(example.com) Now question ...
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32 views

Man in the middle with certificate signed by known CA and DNS spoofing can work?

Assuming that I have a certificate for my local webserver signed by a well known CA like Verisign (so it will be trusted by browsers), and I'm able to DNS poisoning in Man-in-the-Middle to redirect a ...
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436 views

Can I trust DNS servers?

If I use my own VPN and use third party DNS - can I trust it? For example, is there any possibilities that an attacker can track the requests by contacting the DNS-hosting (assume that attacker have ...
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dns lan internet name resolution [migrated]

What is the approach of configuring a internal DNS server to perform name resolution outside of it's scope ? The internal one will handle requests for the local network, but how to configure it to ...
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758 views

Can SSH tunneling over DNS tunnel work in China to use free WiFi at airport?

I have followed a tutorial here: http://ebnj.net/sshoverdns/ This tutorial tells us how to carry all internet traffic via DNS tunnel if your airport enables no-limit outgoing DNS. This guides us to ...
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What stops someone from just redirecting a HTTPS connection to a HTTP version of the site?

Let's say someone does an ARP spoofing or DNS poisoning attack to redirect traffic to their own web server. If the real site has an SSL/TLS certificate, would that stop the hacker from redirecting let'...
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Why do browsers or operating systems not have default DNSSEC validation?

Many resolvers (including TLDs and Root TLDs) support DNSSEC, also Google's OpenDNS servers support it. Yet it isn't checked on the client side by default. Why is this?
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Can a DNS “route” change cause an SSL certificate error?

What I mean by "route change": As a working example, mysite.example.net is set up as: mysite.example.net. 3600 IN CNAME some-other-site.elsewhere.com. some-other-site.elsewhere....
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How do I protect myself when using a public network? [duplicate]

I'm in a hostel with plenty of software engineers. I want to make sure I have some protection. I quickly read about dnscrypt and some VPN solutions. What measures can I take to ensure my data ...
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39 views

How are DNS requests sent when using ovenvpn? Are they encrypted?

I use openvpn in thru the gnome network manager. When my computer is connected to the vpn do DNS requests look like they come from the vpn exit ip or from my real ip? Are the DNS requests sent in the ...
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101 views

Standard for securing web server to client connections via HTTPS on the local area network

I am trying to set up some kind of secure client to web server connection that takes place entirely on local area networks, but I'm having trouble understanding what the recommended best practice is. ...
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38 views

What could you do with a PTR record of “localhost”?

In today's log summary from my SSH server, I found the following interesting entry: Illegal users from: 113.175.205.167 (localhost): 2 times Doing a DNS lookup on 113.175.205.167 does indeed ...
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50 views

Would changing my DNS get through i-Boss?

I'm not exactly sure how the web filter iBoss works but it doesn't seem to be installed on all the computers at my school so I was thinking it probably handles connections directly at the DNS level ...
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Why does our network firewall drop netbios-ns packets?

In our local domain environment, we use Sophos UTM to protect our network. When I check the firewall logs, I can see that a huge number of packets dropped by the firewall are netbios-ns (UDP 137) ...
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57 views

Is there a point to Dnscrypt when using VPN?

If a computer is already connected to the internet through VPN, is there point in encrypting DNS queries? From DNScrypt: DNSCrypt is a protocol that authenticates communications between a DNS ...
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91 views

How does a DNS provider provide SSL?

I use CloudFlare as my DNS provider for my domain, and I learned that they provide SSL. I was confused as to how a DNS provider can provide SSL because my communications between the client and my ...
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47 views

What security implications does DNS prefetching have?

To improve performance, most browsers prefetch DNS records for linked resources in the background so that the browsers already knows where to send the request the instance you click the link. This is ...
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How to protect from WPAD attacks?

If you are in a Windows network, and you basically connect to a website ; And there is an attacker on Linux who changes the hostname to WPAD and configures WPAD.dat in his system, all your PC's ...
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Strange apple dns answers

Could someone please explain to the results of a reverse DNS lookup I ran? dig -x 17.178.96.59 I was expecting apple.com but it also listed a whole load of PTR's. Many looked like phishing sites like ...
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117 views

Google DNS query pointing at ISP instead of Google

I am not sure if this is actually an issue or not or if I am just being too paranoid, but I noticed this upon arriving home to Alaska recently (location is important as you'll see shortly). In short, ...
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Is DNS leak really an issue?

I'm reading about DNS leak and what threat it can pose to VPN users, for instance, this question. But generally, there's tons of similar topics on the internet. But what are people afraid of? I just ...
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Why gethosbyname() is as bad as gets() by design?

I know gethosbyname() has been obsolete for a long time. But I see static analysers report its use as unsafe, and when softwares remove its usage, it tends to be for security reasons. I know there ...
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Detecting Spamming activities of Botnets

Remarks Hello Everyone,thanks for being a nice platform for expressing Everyone's Doubts/Views. Problem Statement I want to detect spamming activity of botnets Background Information about ...
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How do I run proper HTTPS on an Internal Network?

This question has been asked several times, I'll link a few: https://superuser.com/questions/791015/https-over-private-network https://stackoverflow.com/questions/616055/https-certificate-for-...
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What SSL certificate do I need?

I have 2 domains, one where the website is hosted (lets call it www.a.com), and another (lets call it www.b.com) which has a CNAME record pointing to the first one (www.a.com). Which one should have a ...
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Do these DNS requests seem like Conficker/Torpig-like behaviour?

I'm at my wit's end on this one... I have been seeing weird traffic from an IP on a client's local network and I think the host is malicious. Looking at the traffic it is producing, is always ...
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Opt into strict DNSSEC checking - does DNSSEC provide a way for a zone to request strict signature validation?

Is there a way for a domain good.com to promise that it will sign all of its DNS records, and that any unsigned records for any host *.good.com should be rejected? In other words, is there a way for ...
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45 views

What are the requirements of becoming a WHOIS Proxy or Privacy service (not a registrar)?

This question was put on hold as off-topic at Webmasters, so I'm hoping it's ok to ask here. I've read up on the (outrageous) costs of becoming, maintaining and operating a registrar, but I cannot ...
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121 views

Can a rogue DNS server see my passwords?

Recently I've been testing a couple DNS servers to see which one performs the fastest because I need a really fast connection. On to my point, if I were to use a malicious DNS, could they see my ...
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Is DNS caching a security vulnerability?

In FireFox, for example, there are network.dnsCacheExpiration and network.dnsCacheEntries preferences in about:config. Is increasing the length of time and number of cached DNS entries a security ...
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Setting up DNSsec for an exotic TLD

I have a .money domain name and I would like to implement DNSSEC. My registrar is GoDaddy and their DNSSEC management system does not support .money. How can I easily setup DNSSEC for my domain?
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How to confirm that my router is vulnerable to the glibc vulnerability (CVE-2015-7547)?

I have tried PoC from Google (https://github.com/fjserna/CVE-2015-7547) to test my host PC (first execute the server side PoC then execute client side PoC). It was vulnerable. Now I want to check my ...
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44 views

Secure DHCP, DNS, Active Directory Server

Are there any common vulnerabilities when creating a DHCP,DNS, and Active Directory server that should be addressed immediately? The operating System is Windows Server 2012 R2 64-bit.
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How risky is to to use external DNS servers? [closed]

My infrastructure doesn't have an internal DNS server, so I just forward any DNS request to external DNS servers by iptables rules. I wonder how risk that can be, and how easy is it to spoof DNS or ...
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Captive portal DNS tunneling

I recently had a meeting with a security researcher who told me about tunnelling over a captive portal using DNS. I have done some research into this but I was wondering what is the simplest way to ...
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In light of the glibc DNS vulnerability, why aren't Linux distros updating install images?

Doesn't that make the mere act of updating a newly installed Linux instance unsafe, since the initially installed package manager is vulnerable? Am I missing something? For example, the current ...
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Does the glibc getaddrinfo vulnerability affect mobile applications?

Recently Google discovered the "glibc getaddrinfo" vulnerability (CVE-2015-7547) Is this a server side only issue, or can apps be affected by it as well? I'm developing both an iPhone and Android app,...
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TLS and DNSCrypt

DNS traffic (requests and responses) has been encrypted by DNSCrypt. In this case, is hostname (https://www.example.com /destination IP adress) readable in transit by a third party during my TLS ...
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525 views

trying to dns spoof using mitmf

I am trying to redirect a page of taulukko.com to google.com for learning purposes but no success. When i enter in the taulukko.com from the spoofed node i receive: The webpage cannot be found my ...