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Romanian websites for Google, Microsoft, Yahoo, PayPal, and other operators were briefly redirected to a rogue server on Wednesday. The redirect is most likely a result of a decade-old hacking technique that underscores the fragility of the Internet's routing system.
For a span of one to several hours on Wednesday morning, people typing Google.ro, Yahoo.ro, and Romanian-specific addresses for other sites connected to a website that was purportedly run by an Algerian hacker, according to numerous security blog posts, including this one from Kaspersky Lab. Researchers said the most likely explanation for the redirection is a technique known as DNS poisoning, in which domain name system routing tables are tampered with, causing domain names to resolve to incorrect IP addresses.
DNS Poisoning May Have Hit Google, Microsoft, PayPal and Yahoo In Romania [arstechnica.com]