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

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857 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, ...
2
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1answer
82 views

Does DNSSEC provide signed statements that a certain domain does NOT yet support DNSSEC? If not, why not?

In my security class with David Wagner, we talked about some of the reasons why DNSSEC is not widely adopted right now. One of the reasons was that for backward compatibility reasons, clients need to ...
0
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1answer
19 views

how to debug for DNS changing Maleware on (linux/android)?

So by opening an application/browser on my Android device, I found that it pops open a set of ads. I channeled a proxy through my laptop trying to track the first web site it connects to. Later I ...
2
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3answers
3k views

What is same site scripting and what are some exploit scenarios?

I know it is an issue with how DNS is configured , but is it really dangerous if the attacker couldn't access your network?
2
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2answers
57 views

How can I search for registered domains, but not unregistered domains?

There are many many services available to "search for domain names", but every one I have found returns results for unregistered domains; whereas I would like to a wildcard search for registered ...
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0answers
13 views

DNSSEC implementation questions (BIND 9.10)

I am planning to sign multiple DNS zones with BIND and have the following questions which I could not answer by reading the latest BIND 9.10 Reference Manual. How can I use the same ZSK with ...
0
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1answer
70 views

What is the purpose of DNS-based Authentication of Named Entities (DANE) and how does it relate to DNSSEC?

What is the purpose of DNS-based Authentication of Named Entities (DANE)? And how does it relate to the Domain Name System Security Extensions (DNSSEC)? Secondly, how can I verify that DANE is ...
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1answer
54 views

Assume an attacker has taken control of a lot of routers. How would the attacker use them to make a rogue DNS server? [closed]

What can hackers do exactly with hacked routers? I heard about hackers that compromise a lot of routers. I want to know how they have made a rogue DNS server? It's like DNS spoof over WAN. I want a ...
6
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3answers
261 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 ...
2
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2answers
53 views

Does a domain name ever leave my local system if the matching IP is defined in my hosts file?

Given the domain website.org and an a corresponding webserver with the IP 1.2.3.4. If a client defines the IP with the domain name in its host file like: $ cat /etc/hosts [...] 1.2.3.4 website....
1
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1answer
119 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. ...
0
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1answer
127 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 ...
3
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1answer
52 views

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 ...
22
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2answers
2k views

How does a website know the DNS server a client uses?

There are websites which claim to do "DNS leak tests". I don't care so much about DNS leaks but am curious, how does the website know which DNS server I am using? I guessed it would be a header sent ...
5
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1answer
139 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 ...
1
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3answers
37 views

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 ...
2
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2answers
24k views

Is OpenDNS safe to use?

Anyone know anything about OpenDNS? Is it safe to use, or should it be avoided? If it should be avoided, what are the alternatives? I am basically looking for a way to block certain sites from my ...
1
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2answers
20 views

Does the use of the non-registered domains in SPF records introduce a security risk?

Recently I was reading about the Sender Policy Framework (SPF) record syntax on OpenSPF.com. Sender Policy Framework (SPF) is a simple email-validation system designed to detect email spoofing by ...
0
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1answer
76 views

Detecting DNS tunneling

I have been trying to detect/establish DNS tunneling. First of all I logged out of my user account of the captive portal. Findings: $ nslookup <somesite> // works fine $ ping <somesite> /...
0
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1answer
28 views

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 ...
45
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5answers
8k views

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 ...
0
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0answers
13 views

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 ...
2
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1answer
191 views

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 ...
1
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1answer
64 views

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 ...
4
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2answers
1k views

What is the purpose of subdomain enumeration?

There're a number of security tools out there that enumerate the subdomains of a given domain. I wonder: What's the purpose of that in terms of security / hacking? Is there any way to do that other ...
3
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1answer
69 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 ...
5
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1answer
2k views

How to test the validity of DNSSEC from a command line interface?

I am doing a research project on The Domain Name System Security Extensions (DNSSEC). I have a SOA, Stub resolver and a client as well as a attack machine. My question is this. Is there a way to ...
3
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1answer
211 views

How safe is it to use shared SPF record domains?

I'm wondering the following, what if shared SPF records like below are used? v=spf1 include:_spf.google.com ~all v=spf1 include:spf.mandrillapp.com ~all v=spf1 include:servers.mcsv.net ~all Can it ...
2
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3answers
603 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 ...
0
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1answer
26 views

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 ...
2
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0answers
793 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 ...
11
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7answers
450 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 ...
5
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1answer
86 views

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 ...
9
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2answers
131 views

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?
10
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2answers
159 views

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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1answer
59 views

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 ...
3
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1answer
266 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 ...
1
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1answer
34 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 ...
3
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2answers
164 views

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 ...
19
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4answers
5k views

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'...
1
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1answer
45 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.
3
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2answers
107 views

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 ...
2
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1answer
83 views

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....
0
votes
1answer
75 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 ...
0
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1answer
57 views

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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1answer
43 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 ...
0
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1answer
6k views

dns reflection attack vs dns amplification attack

Over the past few weeks I have heard discussions about a DNS reflection attack and a DNS amplification attack. Is there truly a difference between the two or are people just using 2 different names ...
3
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1answer
45 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 ...
0
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1answer
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 ...
3
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2answers
100 views

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) ...