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

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bind9 resolves all queries to one address - a compromised server?

Since this morning we tried to open some SSL sites and were greeted by browser warnings, that certificate is not for this site. Upon checking the certificate, we determined that it is issued to ...
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How do web hosts know you own your domain?

Let's say I registered a domain on Namecheap and want DigitalOcean to be my host. This can be achieved by first setting the nameservers to DigitalOcean in Namecheap's backend: Second, we add some ...
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91 views

How does the “Privacy Protection” option from domain names registrars work?

Some domain names registrars are offering a "Privacy Protection" option to hide your registrant details. Your whois infos will then refer to the "privacy company" providing this service instead of the ...
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178 views

What kind of encryption or obfuscation is this? [closed]

I found this script on a web page who attempted to change my router's DNS configuration. But I can't understant what kind of encryption or obfuscation is used. Here, a sample of the code on the ...
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47 views

In using a VPN service is it possible to transmit data without giving away system configuration details?

In using a VPN service I want to feel comfortable in the knowledge that outsiders cant simply build up metadata on my browsing activities. The fact it is done is somewhat unsettling. I have spent days ...
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110 views

DNS in DMZ or not and mail server architecture

I'm a new user in security.stackexchange.com, I'm a French junior admin sys, I enjoyed to come here! Spend the presentation. I wonder what server I put in DMZ zone, I know the DMZ zone is for all ...
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71 views

Can we prevent DNS-based attacks with SSL/TLS? [duplicate]

Consider the following scenario giving a hypothetical attack: Crypto.com is selling cryptostocks and accepts payments using a payment processor PayEasy.com. The entire site pages (of crypto.com) are ...
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106 views

AirVPN, DNS Leaks on Windows 8.1, but not Ubuntu

I've noticed when I visit dnsleaktest.com using Windows 8.1 & Chrome a bunch of UK IP addresses (Belonging to my ISP) are displayed alongside the Netherlands IP address I should be appearing as ...
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136 views

Why include DNS client cookie in DNS server cookie computation?

The proposed standard for DNS cookies specifies that the server cookie is to be computed as follows: The Server Cookie SHOULD consist of or include a 64-bit or larger pseudo-random function ...
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1answer
46 views

Detect host lookups against a domain/subdomain name

I want to detect, with as much accuracy as possible, the IP address of any remote host performing a DNS lookup of my domain name (eg. nslookup mydomain123.com) and any subdomains as well if possible. ...
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237 views

How was The Pirate Bay datacenter kept hidden?

How were The Pirate Bay's servers kept hidden for so long? You would think that it would be easy finding the servers that so many DNS servers are pointing to. Tracing the chain to the main datacenter ...
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100 views

Is VPN the only way to stop my ISP from logging my traffic?

I do know that my ISP is keeping logs permanently, which I'm not comfortable with because I like my privacy. Having said that, is VPN the only option to prevent my ISP from logging my traffic? The ...
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1answer
92 views

Are there any statistics about packet filtering to prevent IP spoofing on the internet?

DDoS attacks via spoofed DNS(sec) are daily news for the last few years, but packet filtering should prevent IP spoofing on the internet. I tried (as an exercise) to spoof a packet on my VPS and on ...
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1answer
71 views

Why is a DNS Amplification attack considered a DDoS attack?

My understanding is that a DNS Amplification attack involves sending a DNS resolver a bunch of requests with a spoofed sender address, which is the victim's. The DNS responds to this IP address with a ...
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90 views

Script to emulate DNS for Windows machine in honeyd

I want to simulate virtual Windows hosts using honeyd. To do so I have installed honeyd. I have configured honeyd as Windows XP SP1, and now I want to emulate DNS services on it. I used UDPot as a DNS ...
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1answer
36 views

Does DNSCrypt mask/hide the URLs I visit

I use DNSCrypt (https://dnscrypt.org/) and I'd like to know whether it's useful to mask/hide from my ISP (Telecom) the HTTP requests I make in my browser. And how does it protect me? Thanks
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126 views

Is lack of wildcard DNS entry a security vulnerability?

A friend of a friend received an email from a security researcher that looks legit. Researcher submitted several vulnerabilities, one of the them reads like this Vulnerability # ... Title : ...
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1answer
55 views

Can you force your PC or device to use only DNSSec-verified lookup results?

Okay, I'll admit something first-off: I don't really understand some of the practical aspects of how DNSSec protections work very well.(Even after reading resources like this.) Well, I certainly ...
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1answer
111 views

Is DNSSEC really useless if TLS is properly configured?

I was reading this article http://sockpuppet.org/blog/2015/01/15/against-dnssec/ and this line caught my eye, "With TLS properly configured, DNSSEC adds nothing." My gut reaction was to disagree, but ...
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2answers
136 views

Amazon keeps asking for login/cc info via unsecure page - DNS hijack?

All my computers in the house will not connect to Amazon.com, but some unsecure (http) Amazon login page. This is the second time I'm having this issue. The first time I resolved it by changing my ...
6
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1answer
619 views

How do I identify which PC made a suspicious DNS query?

Our IDS detected a suspicious DNS packet going to a Botnet (or similar). Since that DC is a recursive relay, how can we identify the client who made that request. (Windows DNS server)
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28 views

DNS IP address auto reset

I have a unofficial Windows and i noticed that my internet connection gets reset. By taking a closer look at it, i found that the DNS server address is set to an IP in China. Any reason why this ...
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1answer
55 views

Fixing DNS leak - transparent proxy

My ISP is using a transparent proxy to intercept my DNS lookup requests when using VPN. Is there a way to prevent that? I am using Lubuntu if that makes any differance.
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120 views

Investigating a possible rogue DNS Server (maybe DNSChanger)

One of the users of our RouterCheck tool was complaining about random popups containing ads in Spanish and Russian. Upon investigation, we found that the DNS settings on his router were changed to ...
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1answer
58 views

When I visit a site using HTTPS is it exposed to sniffers? [duplicate]

Say for example I visit https://foo.com. Could someone that is sniffing the network determine that I am going there? At what level does the https encrypt the request? I know that data is secured ...
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1answer
64 views

Types of risks for my router

Recently I've read about viruses and worms that attack routers and do some nasty things, incl. DNS changes etc. In the beginning, I just read that some people have issues that their DNS server address ...
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29 views

What are the real risks of enabling unsecure DNS updates on Active Directory intranet domain?

Based on my current research, enabling the unsecure DNS updates is a requirement for enabling DHCP Linux clients from registering their names with a FQDN. While this works fine for Windows machines ...
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1answer
257 views

Can it be dangerous to use not popular(unknown) dns servers?

There is a service called tunlr, which let's you browse the web with no restrictions(Pandora, Hulu etc.). You just have to use their dns server. But now I'm concerned whether the owners of the dns ...
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2answers
632 views

Does DNS-based blocking protect against ransomware?

I have been looking into OpenDNS as something to possibly use at my company, and they claim that Cryptolocker-style ransomware almost always uses DNS to "phone home" and that OpenDNS blocks this, ...
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1answer
124 views

Using dnscrypt on a public hotspot with a captive portal

What strategy shall I take if I wanted to use a dnscrypt with a public hotspot that requires login through a captive portal? Such hotspots require DNS settings to point to their servers (via DHCP) so ...
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1answer
87 views

Why does ikea.com always redirect to ikea china?

Background: This question has been raised here and marked as duplicate. However, it is not fully addressed. To reproduce (not exactly): Set your DNS to 180.76.76.76 (the Baidu DNS ...
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1answer
172 views

My dlink router seems to be compromised

By chance I read today about this huge vulnerability regarding my router Dlink DIR-600. ( http://www.s3cur1ty.de/m1adv2013-003 ) Just out of curiosity about what I would find, I tried to send some ...
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251 views

How to bypass DNS spoofing protection

I know that SSL certificates prevent DNS spoofing, but I was wondering why it is not possible after ARP cache poisoning to set up iptables rules and redirect the origin destination to fake page?
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194 views

How important is split-horizon DNS?

Split DNS returns different results depending on the source IP. It's commonly promoted as significant security measure for internal resources, for limiting enumeration and discovery. I've had many ...
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682 views

DNSspoof not working

My aim is to DNSspoof. My network is using a wireless router with the address 192.168.1.1 and primary DNS is the same as the router address. I have enabled Kernel IP forward in Linux. DNS host file ...
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172 views

'google.com' DNS resolved to addresses of ISP

When I open cmd.exe and do nslookup on google.com I am getting a set of addresses that belong to my ISP. More than that, even when I try to run server 8.8.8.8 or server 8.8.4.4 and query for ...
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60 views

Using a Firewall to Trigger Truncation in DNS UDP Response

Assume I am a firewall between client and server. If the client sends a DNS query with UDP, I should response this query with set the truncated flag=1. As a result, the client will be forced to use ...
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176 views

MITM on popular sites - DNS

Can a MITM attack on popular sites such as Facebook.com Google.com be done by intercepting the DNS requests? Will the user notice something? For instance: Loading https://fb.com The client ...
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1answer
566 views

Is it possible to force client use TCP instead UDP for DNS queries?

Assume I am managing a firewall between DNS server and clients. Is there any way to force clients use TCP rather than UDP, so we can prevent DNS spoof types of DDoS attacks?
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114 views

Does using FreeDNS introduce a security risk?

If you use a service like FreeDNS for a DNS, does this introduce any additional security risk as opposed to simply paying a registrar? Obviously the owner of FreeDNS could hijack your domain. But ...
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121 views

TLS domain name mismatch

Suppose I want to talk to example.com over TLS the and server I am redirected to is foo.com. But during the handshake it can prove it holds the private key that matches example.com certificate. Why ...
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1answer
92 views

DynDNS alongside Tor? [closed]

Is there a way to resolve Dynamic DNS with Tor so that I can connect to my computer behind a NAT even if I am in a country that consider supicious connections to my native country ?
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2answers
64 views

Could my DNS requests get manipulated while using tor?

I just downloaded Tor Browser Bundle and extracted it. I had no copy of my Tor Nodes Settings so i just browsed using the standard nodes and i forgot to disabke Java Script. I did not notice ...
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1answer
2k views

Is my modem compromised?

My modem automatically changes its DNS server from Norton DNS server to AdClick server. How do I prevent this from happen again? Is it possible to have protection from these for modem? How do I check ...
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Behaviour of DNS query packet

When the configured name server resolver is not reachable, the query packet will retransmitted after certain t times (in windows, every 1 seconds until 8 seconds,max). The behaviour of the legitimate ...
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1answer
794 views

Router DNS getting automatically changed

I don't know if this is the correct forum where to ask, but I didn't find anything more appropriate. I have a TP-Link router model TD-W8951ND, and three months ago I noticed that the network was ...
3
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1answer
282 views

Is this the end of malware use of DNS?

I read about the release of a free dataset of malware related DNS queries called "Predict". A researcher or network security team can download or query this data set and use it to identify malware ...
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1answer
177 views

NMAP DNS Resolution

By default NMAP does reverse DNS resolution for a given IP which responds to the host discovery probes. My question is, what are the benefits of getting the host name when performing a network scan?
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224 views

Are IPs and domains in malwaredomainlist.com compromised?

I did an nmap scan on a website that is being hosted by a hosting company. The results showed a rDNS record with an ip and a domain name. When I googled the domain name it appeared in ...
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Does DNSSEC still have the “enumerate all names in zone” problem?

According to Wikipedia: DNSSEC introduces the ability for a hostile party to enumerate all the names in a zone by following the NSEC chain. NSEC RRs assert which names do not exist in a zone ...