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Questions tagged [dns]

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

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1answer
2k 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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Trace the orgins of a DNS request [duplicate]

I installed a DNS server on a Raspberry PI to monitor DNS requests. One request that is curious is "fscta65w.com." It keeps showing up in the querlog from a macbookPro but I can't seem to find out the ...
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DNS Spoof Printer on network

I was wondering if it would be possible to arp spoof my printer and router arpspoof -t printer router arpspoof -t router printer and then reroute all print requests to my CUPS print server on ...
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Is there an alternative to HPKP for dyndns?

For dyndns it's fairly easy to replace the machine behind a domain name: either if the subscription runs out or if the IP changes and the dyndns service hasn't been updated. In that case one can ...
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1answer
63 views

Does a searchable public database exist of (hostname; ip) mappings?

This question is not about the trivial usage of the forward/reverse DNS. Getting the IP of a hostname is trivial (DNS), and using reverse DNS, also we can get (typically) a single hostname of an IP. ...
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Websites that test what IPv6 DNS server I'm using? [closed]

I am concerned with DNS hijacking when connected to a DNS server with an IPv6 address. Is there a website that tests what IPv6 DNS server I'm using? By "IPv6 DNS server" I do not mean IPv4 DNS ...
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1answer
68 views

nmap: Same IP, different domain names, different results?

I'm scanning a network (whose name will not be stated). It has >1 IP addresses. When I tried scanning its subdomains, there are several subdomains that are translated to the same IP address but return ...
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Auditing Sysmon 10 DNS events on Windows 2008 R2

I have installed Sysmon 10 on a Windows 2008 R2 box in the hope of, amongst other things, capturing DNS requests. Sysmon appears to be capturing all other Event ID's except for 22. I have installed ...
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1answer
121 views

Fortigate Creating Millions of DNS events to standard domains

I am trying to tune our SIEM and noticed that we are receiving millions of DNS records every day from the same domains. These are: update.microsoft.com swscan.apple.com softwareupdate.vmware.com ...
2
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1answer
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Does a CAA record on a local hostname in a LAN offer additional security?

A CAA DNS record limits the certificate authorities that may issue a certificate for a domain and its subdomains. Do CAA records make sense in a LAN environment? Assume internal hostnames such as ldap....
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65 views

How does DoH protect against ISP tracking?

Seems like a modern ISP would already be equipped with some basic level of packet inspection to identify outgoing TCP connections even if just for doing traffic shaping or carrier-grade NAT, and ...
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1answer
80 views

How to detect malicious actor altering DNS responses?

I am trying to detect what is causing my DNS to return fake IP addresses for domains like apple, orange, etc. which obviously don't exist. If I do following on my Windows machine: ipconfig /flushdns ...
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How do I white list domain in ASG's?

I need to whitelist https://hooks.slack.com in Application Security Group (ASGs). As I have understood ASGs are static and they don't resolve DNS. Then how do I whitelist https://hooks.slack.com ...
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2answers
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Is there any disadvantage in using OpenNIC for DNS resolution?

What are the advantages/disadvantages of OpenNIC vs ISP for DNS resolution with regards to security and privacy?
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4answers
716 views

How to test CVE-2004-0789 Multiple Vendor DNS Response Flooding Denial Of Service?

I use Nessus to check vulnerabilities on my webserver. It is a Windows Server. Nessus reports that this particular server has a CVE-2004-0789 vulnerability. Here is the description from Nessus: The ...
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3answers
3k views

Is a global DNS record a security risk for phpMyAdmin?

Services like phpMyadmin needs a domain name to access. Instead of adding a global DNS record, one could make a local DNS record (e.g. in /etc/hosts) to access the site. Would it increase security if ...
0
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1answer
124 views

Relying on internal DNS server (Domain Controller) on a DMZ Server

A couple of questions regarding DNS traffic between TRUST and DMZ and best practices. Are there any significant risks in relying on internal DNS from a web server hosted in a DMZ zone? Has the DNS ...
23
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4answers
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More than three domains hosted on the same IP address

Not on purpose I did a reverse IP address look up on my site, and it shows that there are three other websites hosted on my server, and now I'm worried. My web is arturofm.com, and here is the lookup:...
2
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1answer
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Jump box DNS in the public

We have a jump box that allows people to connect via SSH into the system. Would it be a security concern by adding a public DNS entry that points to the jump box? (Would this not be security through ...
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3answers
19k views

What is the Akamai Name Server I see for some big companies?

I have played with DNS a lot lately, and I have found that some big companies' web sites use the Akamai NS as the Name Server for their WWW servers, for example: $>nslookup > www.redhat.com ...
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0answers
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How can an attacker hijack js/css content?

I just encounter an issue, the cached js files showed porn site Here's the simple network diagram. https://cdn.mysite.com/js/app.js shows a porn site, but if I add in query string https://cdn....
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2answers
4k views

What is the best way of finding subdomains of a domain?

I need to find most subdomains of a domain. I know there are many options. I've tried many available in Kali Linux: dnsmap dnsenum dnsrecon dnswalk fierce urlcrazy Most of them only find 2 or 3 ...
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1answer
294 views

DNS Hijack: Only spoofing sites listed in etter.dns

I'm trying to create a more practical DNS Hijack mitm attack. I do the traditional arp poison with dns_spoof method. I don't have any issues getting it to work. The intended domain redirects exactly ...
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3answers
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Does EV SSL certificate makes any difference while used instead of self signed ssl in case of API for android app?

I understand that self signed ssl is risky incase of dns spoofing since the attacker may generate a self signed ssl himself and place it in his ip address and it will trigger a warning in the client ...
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1answer
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Should current DNS servers respond to obsolete DNS records? [closed]

Here is a list of obsolete DNS record types. Should I restrict my DNS server to not respond to these query types? Why are current public DNS servers responding to these query types?
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Why am I seeing SSL events resolve to OpenDNS IPs?

This organization I'm working for uses OpenDNS/Cisco Umbrella. I'm confused as to why I'm seeing requests for SSL traffic resolved to 146.112.255.155 146.112.250.83 146.112.250.64 146.112.250.87 146....
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1answer
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Securing DNS by blocking querys AND responses [Dnscrypt questions]

Visiting facebook.com you will query s.update.fbsbx.com. s.update.fbsbx.com is a CNAME to s.agentanalytics.com. Currently, the only way to block s.agentanalytics.com is to block s.update.fbsbx.com via ...
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1answer
267 views

How many times does a DNS server need to sign?

I have a question about DNSSEC and how many times a DNS server must sign or in other words, how many signatures are there in a day. I know that DNSSEC builds on a chain of trust starting at the root ...
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5answers
163k views

If I use a VPN, who will resolve my DNS requests?

Will they be resolved by my VPN provider, or by my original ISP (if left on "automatic" settings)? Would I have to manually configure a dns server, to make sure my requests will not be resolved by my ...
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2answers
206 views

Does changing DNS help prevent MITM on ISP level?

A few days ago Kazakhstan gov-t passed a law to enforce using gov-t signed SSL certificates on all https traffic on all (almost) ISPs. So when you visit https://google.com your browser will warn that ...
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2answers
500 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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1answer
134 views

Disabling external DNS lookups - is this really so beneficial for security?

I have recently started working for a company which disables external DNS resolution from the machines inside the network by not adding external forwarders to the internal DNS servers - the reasoning ...
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1answer
979 views

DNS Tunneling - Mitigation

I believe the root cause for DNS tunneling is because the internal hosts are allowed to do recursive queries of external domains. For DNS tunneling to work, an internal host should be able to send ...
2
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2answers
5k views

Connecting to my VPN via IP or domain name?

Background: So I use a private VPS to host my own VPN, rather than pay/trust another company to host it for me. I am an intermittent traveller so it is cheaper for me to spin up or down my server as ...
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2answers
166 views

Why don't more DGA malware families use word-lists?

Of all the known malware families that use DGAs to communicate with their C2, only very few use DGAs that generate non-random-looking domain names. For example, Suppobox generates domain names by ...
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2answers
155 views

Spam Russian Subdomains on my Website

I have the EXACT same problem that was addressed in a former thread on Stack Exchange here: https://webmasters.stackexchange.com/questions/103087/spam-russian-subdomain-in-my-website As you can see ...
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1answer
66 views

Checking the reverse IP address to find all DNS records

In the context of Vulnerability Assessment, what is the purpose of checking the reverse IP address of an end-point to find all DNS records of ‘A’ type associated with the IP? I've come across this ...
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0answers
172 views

Why is certificate rejected in firefox, but not IE and Chrome

Question: Is a certificate issued to a subdomain valid for a CNAME in the parent domain assuming a common root CA cert and SAN listing both? (I think the answer is no but I'm uncertain). Is there a ...
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52 views

Why is the attacker allowed to create DNS traffic in a DNS cache poison attack?

According to this article, a DNS cache poisoning attack is performed the following way: Send a large number of resolution requests each spoofed with different source IP information for www....
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2answers
3k views

How to hide dns requests from ISP?

I am using google image a lot. I discovered through Wireshark, any images under preview mode of google images search result actually expose the dns where that image was hosted from. For example, my ...
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0answers
108 views

How to respond domain fluxing happening on workstations

A few workstations have been making dns requests to what looks to be DGA domains and talked to the security appliance vendor with little help. A vendor technician told me that some Apple servers ...
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1answer
356 views

Level 3 DNS default response for invalid host names

I was recently flummoxed by an issue related to me setting my router's static DNS servers to what I understand to be Level 3 DNS servers, (4.2.2.1, 4.2.2.2, etc.). For work I use a company VPN. On ...
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1answer
339 views

Soft-fail vs Hard-fail SPF + Monitor vs Reject+Strict DMARC, could it be counterproductive?

I have a ProtonMail premium plan with one custom domain and a single email address. My domain DNS is protected with DNSSEC. What caught my eye were two things they recommended in the domain setup: ...
2
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1answer
109 views

A third party Web site wants me to validate my domain ownership using a TXT record

What are the security risks with adding TXT records for third party tools? Can they get any information back from your servers with adding that record for them? The example below is from the "have i ...
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5answers
54k 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 https://stackoverflow.com/questions/616055/https-certificate-for-...
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3answers
105 views

What happen when a local device have the same IP as an external website

When I enter 'google.com' in my web browser, my computer goes to the DNS server and gets Google's server IP address, then it look for that address in the local network and when it doesn't find it it ...
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1answer
247 views

What is Passive DNS Replication?

I use Virus Total for Malware Research, and I saw that it has a field called: "Passive DNS Replication", but I do not exactly understand what that means.I searched in VT blog, and they said that it is ...
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1answer
57 views

setting up ssl for cname only subdomain [closed]

I've looked on for an answer on google and other forums for this question but couldn't get a solution or a hint for the scenario that I have. I've a domain, say abc.com, which is live with ssl on ...
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2answers
76 views

Can I alter the DNS cache on my Computer?

Can I alter the DNS cache of my computer. When I search online it only shows result to flush DNS cache and not how to alter it. The DNS cache saved on Windows consist of URL,serverIP and many other ...
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1answer
784 views

What are the possible solution for blocking VPN connection on a home network?

I am not a techie. I am just wanting to force some parentral control using OPENDNS. Opendns works fine however it is easily broken on android or windows using vpn software like ultrasurf or latern or ...