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

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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 ...
3
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1answer
51 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 ...
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37 views

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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13 views

why function “host” gives different results when using IP instead of domain name? [migrated]

I'm learning DNS, and when using the "host" bash function on Kali, i get different results according that i give the IP adress or its domain name equivalent: host -t ns axis.com => ...
3
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1answer
82 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, ...
3
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1answer
74 views

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 ...
3
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2answers
43 views

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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21 views

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 ...
3
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2answers
106 views

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 ...
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39 views

Are name server's data public, and how to retrieve them if they are? [migrated]

Knowing the IP of a name server, is it possible to retrieve the "associations" that this server does between numerical IPs and domain names? For example, a name server who would manage the domain ...
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3answers
128 views

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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46 views

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 ...
3
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1answer
32 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 ...
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30 views

How to do DNS query spoofing?

I was reading out OpenDNS amplification DDoS attack and it says attacker use DNS query spoofing redirected to Victim server. How do i do query spoofing, I wanted to test that in my LAB. is there any ...
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1answer
35 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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3answers
89 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 ...
2
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1answer
57 views

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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1answer
23 views

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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2answers
109 views

How do confirm 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. And now I want to check ...
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1answer
37 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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2answers
93 views

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 ...
0
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1answer
47 views

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 ...
8
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1answer
130 views

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 ...
2
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1answer
65 views

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 ...
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1answer
26 views

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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221 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 ...
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1answer
46 views

Plaintext DNS traffic in a WPA2 session?

The question I have is, in WPA2 session between the AP and client are DNS requests sent plain text? Trying to wrap my head around the latest glibc exploit. Thank you Ted
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1answer
77 views

Can you be vulnerable to the glibc vulnerability in getaddrinfo if you trust your DNS?

I have read that the vulnerability is triggered by a DNS response. How can you be vulnerable if you trust your DNS servers? May your DNS servers redirect your request to other DNS that may be ...
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1answer
63 views

UDP DNS & Firewall

This question might be simple but please understand my lack of knowledge. I am seeing a lot of DNS packets dropped by our firewall (sophos SG125) by default rule 60001. There are three Domain ...
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1answer
167 views

Can the latest glibc DNS vuln be tested on remote servers?

I recently heard of the critical DNS vulnerability in glibc that can lead to arbitrary code execution. I hadn't found much about the cases when the faulty function is called and ways to remotely ...
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517 views

GNU C Library getaddrinfo() Flaw

As you probably already know, this Tuesday a potentially catastrophic flaw has been identified on glibc function called getaddrinfo(), which performs domain name lookups, contains a buffer overflow ...
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2answers
110 views

Why did I get a wrong IP and certificate for www.facebook.com just now? [closed]

I just navigated to www.facebook.com and my browser alerted me that an invalid certificate has been received. I checked the cert in question, and I was surprised to see that the Common Name on it was ...
0
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1answer
42 views

What should I set the TTL for my DNS to?

I've heard before that one should set TTL for the domains of recovery emails to as high value as possible. The threat model here is that an attacker uses social engineering tactics to gain access to ...
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1answer
36 views

Network Scans Find Absent Device

Using Nessus (an uncredentialed full scan) and Nmap (essentially a full port scan), I am finding a phantom device. This device is supposed to be a well-out-of-commission device, but is returning a ...
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84 views

Unknown ports shown on Nmap scan…and other strange behavior

My local network has been exhibiting some inexplicable behaviour. Firstly connecting to my websites domain name from inside the lan redirected me to my router's login page. I checked again with 3g ...
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34 views

How to update a non clientUpdateProhibited domain name?

So I recently learned about domain name locking after having found the *.co domains of a top web site weren’t protected against server and client updating/transfering. (while the .co tld offers all ...
2
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1answer
69 views

DNSCrypt-proxy: This certificate looks valid

I have just installed dnscrypt-proxy and dnsmasq with DNSSEC but I get a strange message in the logfile from dnscrypt-proxy. [INFO] + DNS Security Extensions are supported [INFO] - [dnscrypt.eu-dk] ...
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4answers
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How can changing your DNS protect your online privacy?

Looking at a Unblock-US Features (a DNS provider) on their website it states the following: Stay out of the radar of prying eyes. With Unblock-us, you’ll have peace of mind knowing that your ...
3
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1answer
41 views

How to acquire DNSSEC root trust anchor from IANA?

I want to establish trust in a DNSSEC record. I found, that it can be done $ dig +sigchase +trusted-key=./root.key @8.8.8.8 eesti.ee root.key could be obtained with $ dig . DNSKEY @8.8.8.8 | grep ...
2
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1answer
59 views

Can I use a domain name instead of an IP for msf persistence?

After getting a shell (meterpreter) on the victim, the first thing to do is to migrate and get the system, and then you would install a persistence to connect back to you. But the problem is the ...
11
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3answers
321 views

What are locked domain names technically?

I just learned about domain name locking at registrar level. I’m having problem to understand what it is, all I found is it’s a protection against domain name takeover through transfer. Now, I also ...
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0answers
52 views

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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2answers
80 views

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 ...
4
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1answer
89 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 ...
2
votes
1answer
171 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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3answers
43 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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1answer
87 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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2answers
65 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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1answer
96 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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1answer
111 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 ...