Breach goes from bad to worse for Target and its customers

Company now says up to 70 million cards exposed -- up from 40 million -- and that hackers accessed more data than previously thought

Target's acknowledgement Friday that personal data of 70 million people, not 40 million as previously thought, may have been exposed to hackers in a recent data breach raises new questions about the incident and how it could affect victims.

Target today also said that an ongoing investigation of the data breach has revealed that "guest information" such as names, mailing addresses, phone numbers, and email addresses of customers may have been accessed by the same thieves who hacked into its systems last month.

Much of the exposed data is "partial in nature," the company said in a statement this morning. In cases where a customer email address is available, Target said it would attempt to contact affected individuals.

"We know that it is frustrating for our guests to learn that this information was taken and we are sorry they are having to endure this," said Target chairman and CEO Gregg Steinhafel in the statement.

Target in mid-December revealed that hackers had broke into its systems between Nov. 27 and Dec. 15 and accessed data on up to 40 million debit and credit cards. At the time, Target said that hackers gained access to cardholder names, credit or debit card numbers, card expiration dates and CVV security codes.

Target now says that its subsequent investigation found that data from 30 million more cards was exposed. "This theft is not a new breach, but was uncovered as part of the ongoing investigation," the company said.

The update shows that the breach exposed data on about one third of the adult population of the United States, noted James Huguelet, and independent security consultant who specializes in retail security. "It now implies that consumers who shopped at Target outside of the approximately one month the breach was active have now become potentially affected by this breach," he said. Target's statement suggests that in some cases, only an individual's e-mail address might have been compromised, while in others, the mailing address might have been exposed. Huguelet said the "partial" exposure implies "that multiple systems containing different types of information were compromised [though] that's purely speculative at this point."

Hackers using the stolen information can now target victims with highly sophisticated spear-phishing attacks Huguelet warned.

"I can see a criminal being able to create a very effective attack with each e-mail sent having been customized to include the target's name, address, and phone number. This could very well lead to a massive wave of identity theft across the United States," he said.

Huguelet suggested that all Target customers accept the retailer's offer to provide free credit monitoring, though he added, "I'm surprised that Target is not making this available immediately." Attacks could already be underway and the credit monitoring may come too late for some victims, he said.

Steve Ward, a spokesman for security vendor Invincea, said Target customers should already be on high alert for phishing attacks. The stolen data allows attackers to craft very convincing emails in attempts to pry loose sensitive data.

"Seventy million active email addresses is a treasure trove for cyber criminal. They now have emails they know are active and linked to Target," he said. Where possible, he suggests that individuals with email addresses linked to Target deactivate them.

If the email address is too difficult to change, individuals have to be continually on the lookout for phishing attempts, not just for days, but for months and perhaps years as well, he said.

Credit and debit card information stolen from Target is already being used in new ways. Compromised cards are being marketed online with information on the state, city and ZIP code of the Target store where they were used.

Fraud experts suggest that the location information will likely allow buyers of the stolen data to use spoofed versions of cards issued to people in their immediate vicinity.

Local use of a card makes it more likely that crooks can use it for a longer period of time because fraud detection tools used by banks and other card issuers use locations and frequency of card use to determine potential criminal activity. Banks often decline transactions or require additional authentication only for card transactions that originate from new or unexpected locations.

The breach could be very costly for Target, especially considering the findings of its investigation. TJX and Heartland were hit with similar massive attacks have so far paid well over $100 million in breach-related costs, many in relation to outside investigations.

In the statement today, Target said it expects fourth-quarter sales and earnings to be substantially lower than the results expected before the breach was discovered.

The adjusted earning per share for the fourth quarter is now $1.20 to $1.30 compared to prior guidance of $1.50 to $1.60. Sales during the quarter are now expected to be nearly 2.5% lower than previously expected.

Jaikumar Vijayan covers data security and privacy issues, financial services security and e-voting for Computerworld. Follow Jaikumar on Twitter at @jaivijayan, or subscribe to Jaikumar's RSS feed . His email address is jvijayan@computerworld.com.

Read more about cybercrime and hacking in Computerworld's Cybercrime and Hacking Topic Center.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Show Comments

Blog Posts

Building a human-curated brand

If the FANG (Facebook, Amazon, Netflix, Google) sector and their measured worth are the final argument for the successful 21st Century model, then they are beyond reproach. Fine-tuning masses of algorithms to reduce human touchpoints and deliver wild returns to investors—all with workforces infinitesimally small compared to the giants of the 20th Century—has been proven out.

Will Smith

Co-founder and head of new markets, The Plum Guide

Sustainability trends brands can expect in 2020

​Marketers have made strides this year in sustainability with the number of brands rallying behind the Not Business As Usual alliance for action against climate change being a sign of the times. While sustainability efforts have gained momentum this year, 2020 is shaping up to be the year brands are really held accountable for their work in this area.

Ben King

CSR manager & sustainability expert, Finder

The trouble with Scotty from Marketing

As a Marketer, the ‘Scotty from Marketing’ meme troubles me.

Natalie Robinson

Director of marketing and communications, Melbourne Polytechnic

If you think it can benefit both consumer and seller then it would be great

Simon Bird

Why Ford is counting on the Internet of Things to drive customer engagement

Read more

It's a good idea. Customers really should control their data. Now I understand why it's important.

Elvin Huntsberry

Salesforce CMO: Modern marketers have an obligation to give customers control of their data

Read more

Instagram changes algorithms every time you get used to them. It really pisses me off. What else pisses me off? The fact that Instagram d...

Nickwood

Instagram loses the like in Australia; industry reacts positively

Read more

I tried www.analisa.io to see my Instagram Insight

Dina Rahmawati

7 marketing technology predictions for 2016

Read more

The saying is pretty tongue in cheek. It's not saying that marketers are bad people, nor that they don't take themselves seriously. There...

LYF Solutions

The trouble with Scotty from Marketing - The CMO view - CMO Australia

Read more

Latest Podcast

More podcasts

Sign in