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

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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 ...
2
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1answer
370 views

Is my ISP BGP/DNS hijacking?

I've noticed some very suspicious activity from my ISP. Sometimes I would notice that when I ping google.com it would resolve to an IP which is owned by my ISP. I currently don't have an example ...
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4answers
331 views

Can ISPs log IP connections?

I know most, if not all, ISPs log the IPs you had tied to your network, but do ISPs keep logs of the IPs you have tried to connect to? For example, let's say I went to google.com, would the ISP be ...
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4answers
240 views

Why isn't there a Global Root for SSL?

I was just wondering why there is a file on your computer implementing the trusted root CA's instead of something similar to DNS where there is a file on root servers that computers check against to ...
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1answer
453 views

Netgear WNDR4000 open port 53

Why is port 53 open on the WAN side of the router? And more importantly how do I close it? Port 53 is not one of my forwarded ports. Discovered by doing nmap -pT:1-64 <my-external-IP> -Pn ...
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ISP can detect DNS requests for a website. Can it do the same for websites embedded inside other websites ? [duplicate]

ISP can detect DNS requests for a web site, ie www.google.com . If I have a website ie www.mysite.com, and a webpage ie www.mysite.com/mypage.html and inside www.mysite.com/mypage.html , the web site ...
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2answers
373 views

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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1answer
1k views

Is DNS service secure?

I am based outside of the US, but I still want to watch Netflix. So I am thinking about signing up a DNS service such as unblocked-us, but I worry that as I am now querying an unknown ( relative to ...
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1answer
1k views

DSL Modem Compromised?

Just found out that the primary & secondary DNS servers have been changed to 95.211.156.101 & 5.45.75.11. I had the following setup in place. MAC filtering and WPA2 for WiFi. ...
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1answer
232 views

How secure are the new TLDs ( .us, .io, …) and do they compare to .com? [closed]

The introduction of the new top level domains (TLDs) such as .music, .books, etc. will increase the number of people and organisations adding and removing entries into the root DNS servers (.) for ...
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1answer
211 views

How does a client know that a DNS zone is DNSSEC protected?

Recently, I've been reading about DNSSEC and how it works. I found other questions and some very interesting answers on this and other websites related to this matter. However, I have a question to ...
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1answer
191 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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1answer
629 views

What is Open Resolver Project and how does it solve DNS reflection attacks?

What is Open Resolver Project and how does it give a solution for DNS reflection attack? I also read that Open Resolver Project follows BCP38. What is BCP38?
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2answers
193 views

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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1answer
107 views

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 ...
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1answer
156 views

DNS queries to compromise DNS cache

The transaction ID for DNS queries can take values from 1 to 65,536 and my computer pseudorandomly chooses one for each DNS request. If I sents 1,024 false replies per request, how many requests ...
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2answers
2k views

How can someone sinkhole domains?

The Wikipedia article about CryptoLocker says: In late-October 2013, security vendor Kaspersky Labs reported that with the help of a researcher, it had created a DNS sinkhole to block some of the ...
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1answer
183 views

Attack on authoritative DNS server with high TTLs

The way DNS works, resolvers cache query results per TTL defined in the response. Consider an authoritative DNS server that is compromised, its main A record set to a different IP and TTL of that ...
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2answers
672 views

How does dnsleaktest.com find my DNS provider

Can't see how they find this over the web. I'm on Windows, its in my network config. It changes when I use a VPN provider, but not when I use a local socks proxy connected to a remote server over ...
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1answer
81 views

DNS Redelegation - Security Risk?

I am a web developer and I use Adobe Business Catalyst. To use some of their services it is recommended you redelegate the domain. In other words change the nameservers to Business Catalyst. I have ...
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4answers
1k views

Does using Google DNS make extensions like AdBlock Plus useless?

As many of you probably do, I am not using my ISP DNS because of very low performance, and I am using Google's primary and secondary DNS (8.8.8.8 and 8.8.4.4) which are good speed-wise but, knowing ...
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3answers
357 views

Why is RFC4255 (SSHFP) not used for https?

I had this idea a few hours ago, but of course it already exists and there is even an RFC... Why don't we publish the fingerprint for the SSL/TLS certificate via DNS? We need DNSSEC to make sure the ...
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1answer
556 views

Clear the DNS server's cache?

Is there anyway for the attacker to clear the cache of a DNS server in order to poison it? For example, if someone attacked my DNS server in an attempt to spoof Google.com, they will receive the ...
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5answers
374 views

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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1answer
194 views

Should the email address in the SOA be used to validate domain control?

I'd like to validate the ability to own a DNS domain and am already considering validation that is currently in use by others such as Email validation of Whois contacts Access to the ...
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4answers
195 views

New gTLDs are coming. How will browsers handle cookies, SOP and certificates?

Given that the security "zone" varies based on the TLD, how will the new TLS be handled? For example: A browser may permit cookies to be shared and SSL certificates, and wildcard certificates ...
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1answer
102 views

Network enumeration protection [closed]

I was reading about DNS security, and readed about Zone Transfer and how can be used to retrieve host information of a network, so not allowing Zone Tranfer from external sources will be the solution ...
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4answers
11k views

Pros/cons of using a private DNS vs. a public DNS

I was wondering why a company should use a private DNS. In comparison with a public DNS, which advantages does a private one have, and which issues can a public DNS create for a company? I'm new at ...
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5answers
2k views

Can I avoid DNS spoofing by typing the IP address?

The question is in the title. I have been reading about DNS spoofing. What if I were to save the IP addresses of websites I consider sensitive and then just enter the IP address when I am using a ...
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1answer
2k views

What are the privacy pros and cons of using a public DNS server vs. your own?

Whether I'm using a normal internet connection setup, or tunnelling it through an anonymizing VPN or through TOR, what information of mine is revealed to whatever DNS server that I choose (e.g. Google ...
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1answer
351 views

Assuming no MITM, is Gmail communication 100% secure and private?

I sometimes have to use my personal Gmail account from my company workstation, where I know for fact they are using content-aware firewall(s) like Palo Alto, and potentially other nasty things like ...
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4answers
1k views

What can and can't a malicious DNS do?

I have been thinking of using http://tunlr.net/ for accessing "geo-IP banned websites" like netflix. However, I have my concerns about safety of using some third party DNS server for everything. So, ...
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3answers
120 views

Are different top level domains somehow different security wise?

If so why is the difference? I've tried to google it but nothing relevant was found.
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2k views

Is it safe to have a DNS record pointing to 127.0.0.1?

My development server is on my local machine (127.0.0.1). I have created an A record in my DNS settings that points dev.mydomain.com to 127.0.0.1 so that I can use this domain name for accessing my ...
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3answers
542 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) ...
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5answers
5k 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 ...
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1answer
550 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
92 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 ...
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1answer
134 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?
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1answer
231 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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3answers
6k 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 ...
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7answers
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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 ...
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1answer
6k 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 ...
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3answers
5k 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 ...
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3answers
941 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 ...
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1answer
965 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
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1answer
327 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 ...
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2answers
347 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 ...
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1answer
916 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
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1answer
814 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 ...