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Swisscom data breach: 800,000 customers affected

The 2017 incident took place due to a sales partner security failure.

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Swisscom has revealed its customer data systems have been compromised and information belonging to roughly 800,000 customers has been stolen.

The Worblaufen, Switzerland-based firm said on Wednesday that customer names, addresses, telephone numbers, and dates of birth were exposed due to the breach, which took place in late 2017.

Under the country's laws, this data is considered "non-sensitive" and there is no evidence that financial information was compromised.

Swisscom says that its systems were not hacked, but rather, the "misappropriation of a sales partner's access rights" led to information disclosure using valid credentials for illegal purposes.

The majority of those affected are mobile subscribers together with a handful of fixed network customers. According to the telecommunications provider, the information stored is required when a subscription agreement is reached and sales partners are given "limited access" to this data to "enable them to identify and advise customers and conclude or amend contracts with them."

While the information is protected by specific user logins and passwords, as a sales partner's own system was compromised -- and this may have given an attacker these credentials -- the security barrier was broken.

Swisscom uncovered the data breach in a routine check of systems. The sales partner has not been named and the identities of the threat actors behind the theft are yet to be unmasked.

As a result of the security incident, Swisscom intends to tighten its security for non-sensitive customer information.

"Swisscom stresses that the system was not hacked and no sensitive data, such as passwords, conversation or payment data, was affected by the incident," the company says. "Rigorous long-established security mechanisms are already in place in this case."

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Swisscom reported the incident to the Federal Data Protection and Information Commissioner (FDPIC) and has blocked the offending sales partner from accessing the firm's systems. In addition, the company intends to introduce tighter controls in the future.

Customers can check to see if their information was compromised by sending an SMS with the word "Info" to 444.

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