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

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Anyone out there using Umbrella from OpenDNS? What exactly is it?

I'm still looking for a centrally-managed AV/malware management system and I've been testing out both Panda and Webroot (due to their 'cloud-based' structure that doesn't require a server for me to ...
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34 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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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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81 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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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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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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162 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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327 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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Root/Naked domain and DDOS

Some services like Github has DDOS mitigation measures for their root/naked domain, but not other subdomain(s). What so special about the root domain concerning the DDOS attacks? [1] ...
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DNS zone size overload?

Is it possible to DOS DNS by creating custom dns zones with lots of text records in them so that the size of the DNS zone is in the order for example 100 Gigabyes, and then query all the dns records ...
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508 views

Proxy aware or DNS capable meterpreter?

I'm having issues traversing a proxy protected network and was wondering if there are meterpreter implementations which allow proxy awareness (automatically using windows AD credentials) or which can ...
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423 views

Following redirects from HTTPS to HTTP - Secure?

So I have an HTTP client which supports HTTPS. However, it doesn't follow the HTTP spec recommendation for redirects on POST(which is to ask the user before redirecting) This means, in theory, if you ...
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Is it safe to use namebench?

As the title states is Google's namebench utility safe to run on my Mac and let it use Safari's web history?
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Should Windows 2008 R2 be used as an externally facing DNS name server?

When compared to more traditional DNS name servers, what are the benefits / drawbacks of using a Windows 2008 R2 as a public ns record for a company. What limitations, or security issues would I ...
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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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DNSSEC Why are RRSIG return 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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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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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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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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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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DNS settings compromised from WAN on Edimax ADSL router

My home network Edimax AR-7084gB ADSL modem/router with firmware verison 2.9.5.0(RUE0.C2A)3.5.18.0 was exploited from WAN few days ago. The attacker changed DNS server settings - primary server to ...
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DNS causing SSL errors

On my old ISP's DNS servers, sometimes https://www.facebook.com would return a cert for Akamai instead of Facebook. What I don't understand is that changing my DNS server to Googles (8.8.8.8) fixes ...
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Manual DNS change

If I manually change my DNS setting in the router or in Windows settings from the provider's one to, say, 8.8.4.4 by Google - will it mean that my ISP has no idea which sites I am going to? Maybe it ...
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DNS query through squid? [closed]

My IDS picked up our squid proxy server doing a dynamic DNS request. I wasn't aware squid passed DNS requests from the client to the internal DNS server. Is this possible? Snort Alert: ET POLICY ...
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163 views

Reliability of DNSBLs for Stopping Forum Spam

I know that certain DNS blacklists are considered more reliable than others, in that they don't have as many false positives. I run a forum that is known to be spammed, and I've installed a mod to ...
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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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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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'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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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 ...
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RHS Blocklist, Other blocklists and impacts of RHS blocking on similar domains

I am not very familiar with Blocklists so had a few queries around it. I have a sub-domain example.com which is used to send mass marketing emails i.e. emails are sent from no-reply@example.com. A ...
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Is OpenVPN secure in this way?

I'm familiar with OpenVPN because my home router has a builtin OpenVPN server. I would like to use OpenVPN all the time, but how do I deal with situations where I don't own the routers? ex.: in a ...
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DNS Cache Poisoning as a Foil to SSL

I recently learned a bit more about DNS cache poisoning, and my understanding of the basic way it works is by editing the DNS cache so that when the victim types in, say, www.google.com they get the ...
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Is my service provider hacked and what can I do to protect myself?

I found myself looking at a stock and forex search page when I try to access Chinese Stackexchange using my FireFox browser today. This is what the page looks like: And this is the HTML of the ...
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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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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?
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How would I secure my hosts file?

I know the hosts file is often deemed obsolete by an actual DNS, but what is/are the best way(s) to secure a hosts file (Current Best Practice)? Example: Would I delete the hosts file, input known ...
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Broadband security question

I have a fixed line broadband connection at home. This morning when I tried accessing Google or Facebook through my browser (Google Chrome) I got a webpage asking me to update my flash player. I found ...
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tor and widecap dns leak

I am using a program that I coded in C#. All it does is use HttpWebRequest to request some pages and read info from them. I tried running it through Tor. I installed the Vidalia Bundle and Widecap. My ...
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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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Can Tor browser bundle be attacked like this?

When using the Tor browser bundle, you load the check.torproject.org on start. It tells you when there is a security update to downloads, and let's you click a link to get it. The way for users to ...
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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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How CDN operator will decide content fo me if i am using google public DNS [closed]

As i saw most of the internet is being load balanced even at DNS . And DNS load balancers takes decision on behalf of client's DNS . So I Am just curious to know if i will use 8.8.8.8 as nameserver in ...
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281 views

Certificate validation Local DNS hosts file

I've a question regarding a certificate validation error I'm getting. I'm performing an https request from one machine to another (windows machines). On the destination machine I've configured a ...
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116 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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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 ...
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277 views

Save to setup localhost.example.com to test wildcard SSL?

I have a domain with a wildcard SSL certificate (i.e. "*.example.com"). I also develop using WAMP setups, which I would like to be able to test HTTPS on. There are several tutorials on how to setup a ...
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What is the technical rationale behind intermediary email servers?

EFF's Survelliance Self-Defense (SSD) project has an illustration of how email over SMTP goes through intermediate mail exchange servers: AFAIK each intermediate servers is expected to add its own ...
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Enabling port forwarding on port 53 on a DNS server, why is it a risk?

Well, actually I know that the risk is that somebody from an external network could access IPs and hostnames of the machines on a local network, but I am struggling to understand if this is it or if ...
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Alternative to ICANN? [closed]

What are major DNS services offered that aren't state-controlled. Better yet, why can't we take Bitcoin's model and create a truly decentralized system with P2P DNS? I see potential reasons behind ...
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How to investigate this anomaly?

According to the IT managers, this problem is neither at the server nor at the client but is suspected to be somewhere inbetween e.g. some DNS server that has been infected. Do you recognize this ...