A hacker group has posted the details of 453,000 Yahoo customers online, according to reports.
According to a report on technology news website Ars Technica, the hackers posted login details of the user accounts they claim to have retrieved in plain text from an unidentified service on Yahoo.
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The hacking group, known as D33Ds Company, said it used a union-based SQL injection to get the information that was posted online, according to the Ars Technica report.
Ars Technica reported that a message from the hackers appeared with the online details. It read: "We hope that the parties responsible for managing the security of this subdomain will take this as a wake-up call, and not as a threat. There have been many security holes exploited in web servers belonging to Yahoo! Inc. that have caused far greater damage than our disclosure. Please do not take them lightly. The subdomain and vulnerable parameters have not been posted to avoid further damage."
The details revealed are reported to belong to a voice over Internet Protocol (VoIP) service called Yahoo Voices.