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500 million impacted by Marriott database breach

Mon 3 Dec 2018
FYI, this story is more than a year old

Today, Marriott disclosed a large-scale data breach impacting up to 500 million customers who have stayed at a Starwood-branded hotel within the last four years.

While details of the breach are still sparse, Marriott stated that there was unauthorised access to a database tied to customer reservations stretching from 2014 to September 10, 2018. For a majority of impacted customers (approximately 327 million), the breached data includes some combination of name, mailing address, phone number, email address, passport number, Starwood Preferred Guest account information, date of birth, gender, arrival and departure information, reservation date, and communication preferences.

For some of those guests, their credit card numbers and expiration dates were exposed, however, they were encrypted using the Advanced Encryption Standard (AES-128). Marriott president and chief executive officer Arne Sorenson says, “We are doing everything we can to support our guests, and using lessons learned to be better moving forward.”

A root cause of the breach is currently unknown, but Marriott indicated that the intruders encrypted the information before exfiltrating the data. 

Security expert Brian Krebs reported that Starwood reported its own breach in 2015, shortly after acquisition by Marriott.

At the time, Starwood said that their breach timeline extended back one year, to roughly November 2014.

Incomplete remediation of breaches is extremely common, and when compounded by asset management challenges introduced by mergers and acquisitions, seeing lateral movement and exfiltration after an initial hack is not unreasonable. Starwood properties impacted are as follows:

  • Westin
  • Sheraton
  • The Luxury Collection
  • Four Points by Sheraton
  • W Hotels
  • St. Regis
  • Le Méridien
  • Aloft
  • Element
  • Tribute Portfolio
  • Design Hotels 
What should you do about it?

Malwarebytes suggests that if you’re a customer:

  • Change your password for your Starwood Preferred Guest Rewards Program immediately. Random passwords generated by a password manager of your choice should be most helpful.
  • Review your banking and credit card accounts for suspicious activity.
  • Consider a credit freeze if you’re concerned your financial information was compromised.
  • Watch out for breach-related scams; cybercriminals know this is a massive, newsworthy breach so they will pounce at the chance to ensnare users through social engineering. Review emails supposedly from Marriott with caution.

If you’re a business looking for tips to prevent getting hit by a breach:

  • Invest in an endpoint protection product and data loss prevention program to make sure alerts on similar attacks get to your security staff as quickly as possible.
  • Take a look at your asset management program:
    • Do you have 100% accounting of all of your external facing assets?
    • Do you have uniform user profiles across your business for all use cases?
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