A través de un comunicado de prensa Yahoo acaba de confirmar un robo masivo de data de sus servidores con información privada de los usuarios de sus servicios en línea.

Pero a diferencia de lo que se pensaba en un primer momento no fueron datos de 200 millones de usuarios, Yahoo cree que la cantidad de usuarios afectados es de 500 millones.

De acuerdo a Yahoo, la investigación que están llevando a cabo indica sugiere que la información robada no contiene contraseñas sin proteger.  Además tampoco contiene datos de tarjetas de crédito o información bancaria, ya que esta data no está guardada en el sistema  afectado.

También creen que el autor del robo es un cibercriminal patrocinado por un gobierno y que en la actualidad no se encuentra en la red de Yahoo.  La empresa informa que están trabajando junto con las autoridades para resolver este robo.

Comunicado de Prensa de Yahoo:

A recent investigation by Yahoo! Inc. (NASDAQ:YHOO) has confirmed that a copy of certain user account information was stolen from the company’s network in late 2014 by what it believes is a state-sponsored actor. The account information may have included names, email addresses, telephone numbers, dates of birth, hashed passwords (the vast majority with bcrypt) and, in some cases, encrypted or unencrypted security questions and answers. The ongoing investigation suggests that stolen information did not include unprotected passwords, payment card data, or bank account information; payment card data and bank account information are not stored in the system that the investigation has found to be affected. Based on the ongoing investigation, Yahoo believes that information associated with at least 500 million user accounts was stolen and the investigation has found no evidence that the state-sponsored actor is currently in Yahoo’s network. Yahoo is working closely with law enforcement on this matter.

Yahoo is notifying potentially affected users and has taken steps to secure their accounts. These steps include invalidating unencrypted security questions and answers so that they cannot be used to access an account and asking potentially affected users to change their passwords. Yahoo is also recommending that users who haven’t changed their passwords since 2014 do so.

Yahoo encourages users to review their online accounts for suspicious activity and to change their password and security questions and answers for any other accounts on which they use the same or similar information used for their Yahoo account. The company further recommends that users avoid clicking on links or downloading attachments from suspicious emails and that they be cautious of unsolicited communications that ask for personal information. Additionally, Yahoo asks users to consider using Yahoo Account Key, a simple authentication tool that eliminates the need to use a password altogether.

Online intrusions and thefts by state-sponsored actors have become increasingly common across the technology industry. Yahoo and other companies have launched programs to detect and notify users when a company strongly suspects that a state-sponsored actor has targeted an account. Since the inception of Yahoo’s program in December 2015, independent of the recent investigation, approximately 10,000 users have received such a notice.

Additional information will be available on the Yahoo Security Issue FAQs page, https://yahoo.com/security-update, beginning at 11:30 am Pacific Daylight Time (PDT) on September 22, 2016.