|
Google Public DNS: DNS security threats and mitigations |
|
|
|
Source: Google - Posted by Dave Wreski
|
Here's a great overview of DNS and its intrinsic security issues, and how Google hopes to address them, and improve the security of DNS on the Internet. Because of the open, distributed design of the Domain Name System, and its use of the User Datagram Protocol (UDP), DNS is vulnerable to various forms of attack. Public or "open" recursive DNS resolvers are especially at risk, since they do not restrict incoming packets to a set of allowable source IP addresses. We are mostly concerned with two common types of attacks:
- Spoofing attacks leading to DNS cache poisoning. Various types of DNS spoofing and forgery exploits abound, which aim to redirect users from legitimate sites to malicious websites. These include so-called "Kaminsky attacks", in which attackers take authoritative control of an entire DNS zone.
- Denial-of-service (DoS) attacks. Attackers may launch DDoS attacks against the resolvers themselves, or hijack resolvers to launch DoS attacks on other systems. Attacks that use DNS servers to launch DoS attacks on other systems by exploiting large DNS record/response size are known as amplification attacks.
Each class of attack is discussed further below.
Read this full article at Google
Only registered users can write comments.
Please login or register. Powered by AkoComment! |
