IDG News Service — A popular Bitcoin discussion forum warned on Monday some user passwords may have been intercepted after the site’s DNS (Domain Name System) registrar was breached.in Japan called Anonymous Speech, wrote an administrator for the forum who goes by the nickname “Theymos.” Anonymous Speech could not immediately be reached for comment.
Tampering with a DNS server is a powerful attack. A hacker can direct traffic destined for one website to one that he or she controls, even if a person types in the correct domain name in the URL address bar of a browser.
The attacker could then execute a man-in-the-middle attack on Bitcointalk.org, intercepting encrypted forum submissions, passwords sent during login sessions, authentication cookies, private messages and more, Theymos wrote.
The attack occurred between 06:00 UTC on Sunday and 20:00 UTC Monday. People who logged into the site during this period should change their passwords, Theymos wrote.
Since many people tend to re-use passwords, hackers usually try to see if the captured login credentials are valid on other services.
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