Many administrators would think they have this locked down but the devil can be in the details. The local network can be a surprisingly vulnerable target. Hijacking the Local Network With ARP Spoofing Here are a few different techniques that attackers use to poison DNS cache. How Does a DNS Cache Poisoning Attack Work?ĭNS cache poisoning is when your closest DNS server has an entry that sends you to the wrong address – usually one an attacker controls. Attackers take advantage of this complacency and inattentiveness to steal credentials or more. Humans trust DNS to a fault, and never really check if the address in their browser is the address they expected. DNS is currently a trust first system, which is why it’s easy to take advantage of. This was an intentional attack designed to keep traffic away from WikiLeaks with some success.ĭNS cache poisoning attacks are sneaky and difficult to catch for average people. WikiLeaks was also targeted by attackers who used a DNS cache poisoning attack to hijack traffic to their own WikiLeaks-like version. One person misconfigures a server, and suddenly hundreds of millions of people feel the effects. This incident demonstrates how dependent on DNS we are. It’s gotten better over the years, but one misconfigured DNS server that pulled DNS entries from a server in China – and all of a sudden, no one can get to Facebook.
Examples and Effects of DNS Cache PoisoningĭNS wasn’t designed to manage the modern internet at all. Your DNS server then saves that new entry to your cache for faster response times. If your closest DNS server doesn’t know the IP address you need, it asks other upstream DNS servers until it finds the IP address for the website you are trying to hit. Each server stores a list of DNS records it knows – this is called a cache. To keep your DNS requests quick, the original developers created a distributed DNS system. It translates end-user friendly URLs like to the IP address like 192.168.1.169 which are used by computers for networking.ĭNS caching is the system that stores these addresses in DNS servers all around the world. Think of it like the phonebook for the internet. DNS is the worldwide catalog for IP addresses and domain names. What is DNS Spoofing and Cache Poisoning?īefore we talk about the attack, we need a refresher on what is DNS and DNS caching.
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