These attacks aren’t completely unexpected. How to change your router DNS settings and avoid hijacking However, the researchers found ways to get around this, and that a third of DNS providers are vulnerable, a figure that includes the most popular DNS services. In the past, poisoning attacks were thwarted by adding encryption and other tricks to the DNS processing.
But what if you could change these remembered addresses and use destinations that were under the control of bad actors? That is essentially what cache poisoning does. When a new request comes in to match a domain name, such as, with its appropriate DNS entry, the server first checks to see if it has already done the work in its memory and sends the request on its way. What this means is that the typical DNS server maintains a list of prior requests in its memory. Recently, a group of academics have written about a new DNS attack method using cache poisoning. We have already written this information piece on protecting DNS on our Avast Business site. It discusses how to best repel this and other kinds of DNS attacks.īut the bad guys are getting cleverer.
Sadly, DNS attacks are on the rise, increasing in sophistication and also just in terms of raw numbers. Getting serious about DNS protection means understanding the risks and educating yourself about service featuresīy now, most of us know what a distributed denial of service (DDoS) attack is and how they are accomplished, through leveraging legions of endpoints sending large amounts of network traffic at a target.īut what is less well known is how this is just one of many misuses of the Domain Name System, or DNS.
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