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

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Is DNS secure when using DNS crypt?

Is it the same security level like a VPN DNS wise when using Open DNS crypt servers plus DNS crypt proxy? I installed both packages in Ubuntu and now unless I have the right IP entry in the network ...
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1answer
65 views

DNSSEC: Why are RRSIGs returned in the “Answer” not “Additional” section?

Looking at Wireshark traces of DNSSEC responses, I see that the RRSIG is returned in the "Answer" section, even though it wasn't part of the query. Why isn't it returned in the "Additional" Section, ...
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280 views

Defence against promiscuous detection techniques

As an attacker,how do I prevent people from finding out that my NIC is in promiscuous mode? For test like ARP and DNS how do I defeat the users detection mechanism?
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78 views

Getting the DNS root name servers in a secure way

It doesn't happen often that a root name server changes, but when it does sometimes it takes months for OS vendors to provide patches and in the mean time there is a security risk. So: How to get ...
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1answer
113 views

Abnormal SYN traffic from Blackhole DNS servers

I have been getting alerts from an anomaly based signatures for abnormally high SYN traffic. The traffic is coming from blackhole DNS servers. I hadn't had any experience with Blackhole servers prior ...
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34 views

Shouldn't DNSCurve be parallel to DNSSEC at root level for diversity?

As per the answer at If DNSSEC is so questionable, why is it ahead of DNSCurve in adoption?, it's been determined that one of the reasons that DNSCurve is behind DNSSEC is due to the nature of the ...
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2answers
226 views

What are the pros and cons of using DNS to block unwanted domains?

There are many methods to block unwanted outgoing requests. Examples include browser settings and extensions, and .hosts files. While DNS blocking won't affect direct accesses to a numeric IP address, ...
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2answers
315 views

What types of attacks and abuse does DNSSEC protect against?

I've read lots of different articles on what DNSSEC is and that it provides authentication for DNS. What I unfortunately haven't seen is a good description of the types of attacks and abuse that ...
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1answer
526 views

Forensics - trace back DNS query origin on host?

So I tried to search the web for answers but didn't find any. Is there any way to trace back which exe file or application caused the computer to make a specific DNS query?
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What makes Let's Encrypt secure?

Let's Encrypt is an initiative from the Electronic Frontier Foundation (EFF), Mozilla, Cisco, Akamai, IdenTrust, and researchers at the University of Michigan that aims to automatically provide every ...
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5answers
2k views

How secure is binding to localhost in order to prevent remote connections?

Let's say we're running a service that's bound to localhost (127.0.0.1), and the goal is to only allow local clients (i.e. from the same machine only) What techniques might be used to break this ...
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118 views

Malicious Website URL [closed]

Recently I found out that there are malicious websites that do not have a domain name on its own. For example, 94.247.2.195 as in ...
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339 views

Difference between DNS spoofing and phishing [closed]

I am writing a bachelor thesis and I am having a hard time figuring out the difference between phishing and DNS spoofing. From what I understand, DNS spoofing is a way to achieve a succesfull phishing ...
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1answer
90 views

DNS resolution attacks by flooding spoofed replies

Each DNS request has an ID of 16bits. In the event that an adversary is unable to sniff the query, a way to spoof the DNS reply is to flood the resolver with many replies. Request from victim Query ...
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1answer
119 views

Does any DNS Recursive resolver accept a “DNSSEC-only” option under DNSCurve?

I want to use DNSCurve (for privacy) to a trusted DNSSec resolver (for integrity), and want to ensure that I can tell a recursive resolver (like 8.8.8.8, or OpenDNS) that I only want DNSSec queries. ...
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1answer
85 views

How Fast Flux technique works exactly?

I was reading about botnets and C&C servers and saw this term. I've read this Wikipedia article but I couldn't really understand what and how this is working. I think its some kind of proxy ...
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1answer
121 views

Is there an HSTS equivalent for DNSSec?

Is there any way to set a DNSSec-always policy similar to how HSTS commands Web Browsers to always use HTTPS? This would mitigate a DNSSec-strip attack (similar to SSLStrip) I'm also unclear if this ...
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1answer
86 views

I just deployed DNSSec. Is there any benefit in DANE for a CA- issued Cert?

I just deployed DNSSec at https://val-id.com and https://getvalid.com Since DNSSec is a requirement of DANE, and I have a CA-based certificate, can I show my support for DANE-based deployments by ...
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3answers
810 views

External websites in logs [duplicate]

I have a website, let's call it www.good.com. I've been getting a lot of requests to www.good.com under completely different URLs than www.good.com. I suspect this traffic is also causing some site ...
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2answers
434 views

Might Google log every website I visit using Chrome?

I wanted to start using Chrome for quite some time now, but I really don't want to tell Google about whatever sites I visit. So I was wondering if Chrome sends any data to Google telling them what ...
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1answer
71 views

DNS Rebinding attack - does this attack require victim to use an attacker's DNS server for resolution? How will that happen?

Usually a preferred DNS server will be set in router's configuration and it will be either the organization's server or some trusted public server. So how would attacker get the victim to use his DNS ...
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1answer
1k views

proxychains + dnscrypt + tor

I'm currently working in Kali and I'm trying to boost my security and anonymity online. Please, bear with me for I am no expert yet. Googling and searching here has yielded useful info but not enough ...
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2answers
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How can I stop someone from displaying my website on his domain?

I just discovered that someone is pointing their domain name to the server I use for a website, which results in traffic to their domain displaying the content of my website. How can I stop this ...
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1answer
296 views

Is it possible to redirect someone to a fake site without changing the hosts file?

Is it possible to redirect someone to a fake site without changing the hosts file? When I access a bank site, I receive a fake page. But my hosts file does not have any changes to do this. Is it ...
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0answers
119 views

Why would home routers accept incoming DNS traffic?

I stumbled upon an interesting paper (PDF Link) where researchers found out that more than 58% of the DNS open resolvers that are blamed in DDoS attacks are in fact home routers distributed by ISPs to ...
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155 views

Using DNS to track browser activity on a LAN

I am trying to create a small network auditing script that tracks HTTP and HTTPS domain names visited by certain hosts using the libpcap wrapper for Nodejs. At its best the script would be able to ...
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2answers
176 views

Using free subdomains to circumvent web filtering systems

(I was told that this was the place to ask this by someone from Webmasters, if I've got it wrong again please give me a chance!) I'm running a personal proxy service for the use of myself and some of ...
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2answers
408 views

Google DNS in Firewall logs

I was viewing my firewall logs and come across the IP 8.8.8.8. Further check reveals it belongs to Google DNS. And such traffic has been going out from some of our LAN segment PCs. From here on, how ...
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1answer
293 views

How can I protect myself against DNS leaks?

As discussed here, a DNS leak is where DNS lookups ignore your current routing (in the example of a VPN connection) and still end up going out over your normal internet connection. This can ...
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1answer
203 views

Is a ptr mechanism in an SPF record secure?

If I understand http://www.openspf.org/SPF_Record_Syntax correctly, any machine with an IP that points to my-domain.com can send email as if it's from my-domain.com if I'm using ptr in my SPF record. ...
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1answer
119 views

How does the DNS-spoofer know the original destination of the packet?

It's perhaps my lack of deeper knowledge of how the DNS, NAT or TCP works, but I have been thinking about the following scenario and can't figure out the following problem which arises in DNS-spoofing ...
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206 views

Roommate Frequently Hacked — How Do I Protect My Network/Devices?

If you absolutely had to share a network with a user who had a very lax approach to security and was frequently hacked (1-2x month for over a year now), what might you consider doing to secure your ...
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ISP glitch or a malware? Has this ever happened to you?

Brief background: I consider myself a relatively paranoid power-user, if not an absolute pro. I regularly update my AV and keep up with all the latest updates on my Windows 7 machine. But what ...
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70 views

Security risks of allowing customer to use his own domain for a hosted SaaS application

As a SaaS hosting, we are considering allowing customer to use an alternative domain to access his SaaS environment. Default domain owned and hosted by us: customersubdomain.ourdomain.com ...
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4answers
261 views

How can I determine the domain controller when it's not in DNS?

On a penetration test going in blind for an organization, meaning no knowledge of network topology of design, no idea what the domain(s) might be, and domain controller is not apparent in DNS...how ...
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66 views

Unpublished server

Is it possible to setup my web server such that only certain sources can access and the public from internet has no access? i am thinking that we could just not publish our web server URL/IP to our ...
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1answer
153 views

Strange block page on OpenDNS?

This morning I went to the internet and accidentally clicked on a blocked website (OpenDNS blocked it). Though there was something strange on the place of the icon there was a little router icon and ...
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2answers
371 views

DNSSec vs SSL and IPsec

Theoretically, DNS cache poisoning shouldn't matter,because everything important is protected by SSL and IPsec. So why DNSSec was developed? Aren't the first two protocols sufficient?
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487 views

Security risk with using internal IP on public DNS

A web server inside the office network which is accessed by staff internally and the internal DNS resolves web.company.com to the server's LAN IP. Publicly, company.com nameservers belong to their ...
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2answers
342 views

What can my university see by installing a CA root certificate on my computer, even when I'm using a VPN?

To use the wifi at my university, you must install a CA root certificate by them. In my case, I am using a Mac computer with a VPN installed. I'm curious, what can they see me do on my computer by ...
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Kaminsky Bug DNS Cache Poisoning

I'm trying to use Kaminsky DNS cache poisoning method. I'm using bind9 server on ubuntu and static port. So far I achieved to insert a line into DNS cache which is ;additional www.blalba.com 80000 ...
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1answer
1k views

Attackers of Google DNS hijacking

As we know Google DNS server (8.8.8.8) in 14th and 15th March was hijacked in Sao Paulo. And subsequent to this event, BGPmon.org announced an alert. Now, In a course assignment, we are asked to ...
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DNS poisoned cache does not have any effect [closed]

I try to reproduce the attack, revealed by Dan Kaminsky in 2008, to poison DNS cache. I made my own virtual network, and all I do is confined within. The poisonning seems to work. But is doesn't. ...
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70 views

Silent security on android

I saw a DEFCON talk about owning back a stolen PC/Mac, with a SSHd daemon and a dynamic-ip service installed,running in background. I was wondering if is it possible to achieve tha same results on an ...
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2answers
146 views

Which is the best antidote for DNS cache poisoning?

I know some antidotes for DNS cache poisoning attacks, both simple as port randomisation, and more complex as DNSSEC. But, which is the more effective? Which solutions are really deployed in the ...
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1answer
256 views

DNS Rebinding attack - will the victim's browser send cookies?

How does a DNS Rebinding attack works? How can it violate the Same-origin policy? Will the victim's browser send cookies to the remote server (specified by IP), when the domain is not the same as is ...
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1answer
57 views

Wildcard DNS entry from a security PoV

We are going to release our new product which will have customers create their own subdomains. This requires having a wildcard DNS on our main domain (We have no other options, right?) Are there any ...
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5answers
4k views

What is the best way to run MitM attack on my wireless network?

For research purpose, I want to launch a MitM attack on computers that are connected to my wireless network. I wonder what is the best way to do so. Notice that I control the router, and do not want ...
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4answers
1k views

Masking IP address and port number for Web application [closed]

I have a Web application running on port 89 ( non-standard port) of a Windows 2012 R2 machine. The login page for this application needs to be accessible through a link on my website - let's call it ...
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2answers
163 views

Browser page “Not resolved” page hijacked by yandex [closed]

Any domain that cannot be resolved defaults to yandex right now, on any browser on my system. Helper objects or extensions are not installed. It turns out that the ISP (Turk Telekom) is employing ...