Threats – New & Insidious (4 of 5)
{"Image DocumentName": "Threats \u2013 New & Insidious (4 of 5)", "Image ImageDescription": "DNS Redirection: Internet service providers (ISPs) such as Time Warner Cable claim they re trying to help with DNS redirection, but the reality seems to come down to money. Domain Name System (DNS) redirection overrides your browser s normal behavior when you can t reach a webpage. Instead of displaying the normal 404 File Not Found error, the ISP sends you to a page of the ISP s choosing usually a page full of paid advertising and links. Innocent though that practice may be, computer viruses can do the same thing, redirecting your browser to a hostile page the first time you misspell a domain. With ISPs, you can opt out of their DNS redirection (you ll find links below all the ads); with viruses, stay on your toes. Make sure you know what your browser s default 404 page looks like, and take action if you see anything different. Open DNS Resolvers: Another danger lies in the way some DNS servers are configured. An open resolver can offer information it isn t authorized to provide. Not only are open resolvers exploited in distributed denial-of-service (DDoS) attacks , but an attacker can poison the DNS cache, providing false information and incorrect resolutions that must be detected to be corrected. If your browser trips over a case of cache poisoning, the agents in charge of a hostile server can glean detailed information about your system especially if you re in the middle of an important transaction. How can typical users solve this dilemma? The chilling answer: They can t. It s up to Internet service providers to address the problem. (DNS spoofing (or DNS cache poisoning) is a computer hacking attack, whereby data is introduced into a Domain Name System (DNS) name server\u2019s cache database, causing the name server to return an incorrect IP address, diverting traffic to another computer (often the attacker s).", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}