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

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3answers
387 views

Security implications of an exploited router

So I completely understand that routers and local networks need to be kept locked down, etc. What real security threats can come about from an attacker who has remotely accessed (telnet or web gui) ...
5
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5answers
4k views

Why can we not block DNS Amplification attack by blocking UDP packets or DNS response packet?

I mean if the attacker tries to ask all the open DNS resolver respond to a web server. The web server can just block its UDP ports. If the all the DNS response go to a Authoritative ...
2
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1answer
366 views

External network DNS spoofing

I've been thinking recently if its possible to DNS spoof an external network. Let's say for example you are attacker.com and your victim is of course victim.com. Then I've thought of 2 scenarios: 1. ...
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1answer
83 views

Redirect attack [closed]

I just discovered that our server other's website for example: http://destiny.mbtosi.com/styles/new/images/no.png should say "This Web Page no longer exists." but in 50% hits it shows an image from ...
0
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1answer
123 views

The importance of changing DNS when Using Antifiltering software

Is it safe that sometimes my Anti-filtering program does not change the DNS address?
1
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1answer
163 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 ...
17
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3answers
4k views

DNS Amplification DDOS attack

During the weekend I made some tests to simulate an DNS Amplification DDOS attack. sending about 90Mb/s traffic I was able to generate about x.x Gb/s amplified traffic which sent our datacenter ...
15
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7answers
1k views

Would it be possible to overload a large part of the internet, and if so then how?

Last week a news article went viral about a Dutch web hosting/data center company that was allegedly using a DNS amplification attack to DDoS an anti-spam company, because they blacklisting the ...
4
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2answers
4k views

DNS Spoofing vs DNS Cache Poisoning

What is the difference between DNS Spoofing and DNS Cache Poisoning ??? It seems like there are little differences between two attacks, with an exception that DNS server is actually might cache the ...
3
votes
3answers
3k views

To DMZ, or not to DMZ

So for an assignment, we need to create a scheme (and eventually also the set-up) of a couple of servers in a network. The 'networks' are: Internal network DMZ The internet And the servers we ...
5
votes
3answers
646 views

Why would you want to run DNS servers externally?

Something that's never made much sense to me is when environments have DNS servers which are publicly accessible (on the internet). This more often than not seems to leave them vulnerable to Cache ...
0
votes
1answer
562 views

DNS Cache Poisoning and Snooping

I'm trying to do two things here. The first is poison the cache of a target DNS server. A scan has suggested the network I'm attacking is vulnerable to CVE-1999-0024. My understanding of this ...
3
votes
1answer
225 views

Why is a separate reconnaissance server needed for DNS cache poisoning?

I'm trying to understand how Metasploit's DNS BailiWicked Host Attack module works. One of the required module options is a "reconnaissance" nameserver (option RECONS). What I understand from the ...
5
votes
2answers
342 views

Is this a DNS attack?

The following graph shows the UDP DNS queries/sec (blue) and DNS responses/sec (red) of traffic passing a router over the preiod of 4 days. DNS query is a DNS packet with query/response flag set to 0 ...
2
votes
1answer
458 views

How to verify DNSKEY by using its corresponding DS

A DNSKEY on a name server can be verified by using it DS stored on its parental name server. According to RFC4034: The DS record refers to a DNSKEY RR by including a digest of that DNSKEY RR. The ...
6
votes
1answer
496 views

Should content delivery depend on FCrDNS (forward-confirmed reverse DNS) look-ups and why?

First, let me clear that this isn't a duplicate of Does deliberately wrong information from a DNS server violate standards generally accepted good practices? thread, as I'm not interested in legal ...
0
votes
2answers
2k views

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 ...
2
votes
1answer
466 views

What is a DNS leak?

I'm planning on getting a VPN service (probably Privateinternetaccess) and read that it is imperative to plug DNS leaks. The only information I found on google describing what these are is here and I ...
2
votes
2answers
292 views

DNS cache poisoning

What are the things the attacker needs to know from the victim to perform DNS cache poisoning ? for example : IP , Port number and Transaction number what else ?
13
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3answers
681 views

Do any DNS registrars support multi factor authentication?

I am looking for a DNS registrar that supports strong multi-factor authentication. Does any DNS registrar support multi-factor? Is this a legitimate need?
21
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3answers
789 views

What are some risks of purchasing a “used” domain name

If you purchase an existing domain name that was already used by someone else what are the ways in which the domain could have been broken by the previous owner? Are such problems common and are there ...
8
votes
3answers
13k views

How can I identify open DNS resolvers in my network?

This article highlights how open DNS resolvers are being used to create DDOS attacks across the internet. How can I identify whether any of our DNS servers are open? If I find that we are running ...
6
votes
1answer
2k views

Which security risks are associated with alternative DNS providers?

I'm considering using an alternative DNS provider on my computer. Which risks do I run if I use one? I already know that the DNS provider may return a malicious IP address when I'm trying to access ...
1
vote
2answers
213 views

anti virus acting up/DNS poisoning

I was running my desktop and the AV deleted a file that it said was a virus (this was not during a scan, just normal usage). Now I'm just browsing the web and I got a couple of DNS poisoning attacks ...
4
votes
2answers
1k views

How do I find all domains hosted on a single host?

I found several websites offer a function that allows you to list all domains hosted on the same machine, e.g you supply a.com, and it tells you b.com and c.com are both hosted on the same machine as ...
5
votes
3answers
500 views

Does NAT break source port randomization?

The standard defense against the Kaminsky attack is to use source port randomization for all DNS requests. Does NAT break the security benefits of source port randomization? In more detail, consider ...
0
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1answer
352 views

How have DNS recursion attacks happened?

There are a few resources describing how to carry out DNS recursion attacks. Is there any good explanation to help me understand how these attacks work and if systems on my network are still ...
2
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0answers
539 views

Hack scenario when a person has a non-superuser shell [closed]

Suppose that there are following three machines in the network: Machine A: Microsoft Server 2003 Service Pack 2 FileZilla 0.9.29 beta ftp server (TCP 21) Mcafee ePolicy server (81), remote desktop ...
2
votes
1answer
118 views

How did DNSChanger rogue name servers work?

I know DNS changer, changes DNS server with its own Evil DNS server on an infected computer, then the DNS servers point to their own rogue nameservers and the nameservers change the ads on websites ...
16
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4answers
652 views

Global Blackout is a myth?

In order to shut the Internet down, anonymous claimed that putting-down the 13 root DNS servers of the Internet and therefore disabling the HTTP Internet, the most widely used function of the Web, ...
3
votes
2answers
191 views

Unecrypted connection to server - safe?

I am using heroku and cloudflare. I am going to release my website but I don't want do it without SSL. Now I always need an heroku addon to add my SSL certificates which costs $20/month. Cloudflare ...
0
votes
1answer
1k views

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 ...
1
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1answer
203 views

How does http://un****-us.com/ work?

There is this site un**-us.com which supposedly allows you to bypass ISP rules such as content restriction on a particular area. Now , it is well known that routing your traffic through a web proxy ...
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votes
1answer
181 views

Is .bank owned by banking industry or not? [closed]

According to https://idc-insights-community.com/financial/financial-services-technology/the-four-letter-word-that-could-change-the-busines Banking Industry was lobbying for .bank But as I read this ...
4
votes
3answers
492 views

Are there DNS analysis tools that could detect bad DNS results?

Are there any tools (or at least methods that would work, if no free tools currently exist) which one could use to detect false DNS results? It would be very simply to detect an attack along the ...
2
votes
2answers
2k views

DDoS Protection for DNS providers

Zerigo, our DNS provider has reported to have been under heavy DDOS attack in the last 24 hours or so. Considering the distributed nature of DNS, and their architecture consisting of 5 main DNS ...
4
votes
1answer
273 views

Does deliberately wrong information from a DNS server violate standards generally accepted good practices?

For certain host names my DNS gives me a wrong ip address (the ip address of a transparent proxy) for which inverse DNS look up does not give me back the host I originally looked up. This is related ...
3
votes
1answer
257 views

Can NSEC domain enumeration happen for zones with wildcard records?

In DNSSEC, NSEC records are used to provide proof of nonexistence. The trouble is that these records provide pointers to existent domain names (the closest known domain in either direction) ...
3
votes
2answers
4k views

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?
3
votes
2answers
586 views

How does DNS Changer malware detection work?

This malware directs your computer to use DNS servers under control of the badguys. These DNS servers were taken over by the FBI. They were replaced with clean ones, to prevent service disruption, but ...
1
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1answer
2k views

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?
6
votes
2answers
975 views

Could somebody explain how DNS poisoning might occur in this scenario?

I read the following statement in a security blog using the same source port over and over again for dns queries instead of randomizing them is a vulnerability for dns poisoning Could somebody ...
1
vote
1answer
336 views

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 ...
1
vote
1answer
133 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 ...
4
votes
3answers
974 views

Does DNS pinning protect against all DNS rebinding attack?

I found an example of a DNS rebinding attack scenario in the paper "Dynamic Pharming Attacks and Locked Same-origin Policies for Web Browsers". Figure 1: An example of a dynamic pharming attack ...
2
votes
4answers
14k 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 ...
5
votes
7answers
17k views

Are services like Hide My Ass and UnoDNS reasonably safe to use?

While in Germany, I want to keep using my Netflix account, watch PBS, CNBC. I have found following services: A VPN: https://hidemyass.com/vpn/promo/1/5/ A DNS: http://www.unotelly.com/unodns/ I an ...
19
votes
6answers
3k views

Why do DDoS attacks cost a fortune to stop?

I have read so many stories that a major DDoS attack is causing companies thousands of dollars to mitigate. I have two questions: Is this because they try to keep the servers accessible to real site ...
1
vote
1answer
3k views

What are the risks of removing ISATAP from the default global block list?

The process of installing Microsofts pseudo VPN called Direct Access requires me to remove the ISATAP name from the default global block list by running this command: dnscmd /config ...
5
votes
1answer
207 views

Kaminsky Bug Exploitation

I am trying to exploit the Kaminsky bug for a school assignment. The specific version of the bug that I want to exploit is sending a forged packet with false information about www.domain.com so that ...