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Walmart Stored Value Cards Compromised
morcheeba writes "It appears that Walmart's pre-paid gift cards have been hacked. Customers are buying cards and finding that criminals have already emptied them of value. It seems someone has access to Walmart's database and/or registration data, and can create clones of recently activated cards. (via engadget)"
First, look at how gift cards work. Many retailers use the model where their gift card records in their database created upon activation. This means they don't even ask the manufacturers for a list of "cards printed"; they simply direct the manufacturer to produce "a million cards in this number sequence, label them $20," that sort of thing. The value is added when the record is created at issuance. I'm assuming Walm*rt is operating in a similar fashion.
It's theoretically safe, because a shoplifted card isn't redeemable. The cards never actually "store" their value, all the value is located only in the database (more correctly, the value is in the ability to redeem from the database.)
So, if someone is redeeming the cards in a distant state just hours after issuance, they're doing it by sniffing the data real-time, somewhere on the inside of Walm*rt's systems. The article implies that the thief knows when the card is issued, and cashes it in within hours. Cashing the cards in distant states implies network access to at least run the scam (although that may be an email to a conspirator.) The fact that the victims were located in different states implies the perpetrators either have central access to the database involved, or have access to the POS systems that are selling and activating the cards.
The points of access are numerous. This could be happening in the POS registers, the store POS servers, the networking gear, the central authorizing servers, the central sales logging servers, or the database. It could be someone in their security group looking at electronic journals on-line. It could be a hacker in the parking lot with 802.11 gear telnetting to any of the above equipment, emailing card info to his buddies. The redemption is probably being done via "forged" cards, which might be as simple as printing a barcode on a sticker, covering the existing barcode, and then keeping the cards after redeeming them to hide the evidence. A smart thief would redeem $149 on a $150 card to keep the card with the $1 balance on it in his pocket.
That's a lot of ground to cover for their investigators. Given their M.O. I can think of a few traps they can set to catch these guys, but they're probably going to take time to implement. And with the high probability of an inside job, who do you trust in their systems end to help you catch the bad guys?
John
I remember reading a while back that one of the major retailers, possibly walmart had gift cards with sequential serial numbers, stored on the magstripe in plaintext, so anyone with a card reader/writer can easily change the id stored on the gift card.
Theres an 800 number you can call to find out the card's balance, so it just takes a little time and guesswork to find a card number with a balance on it.
* It's probably not illegal. If walmart wants to sell snapple bottlecaps for $20 and accept them in their store to buy $20, it's not anyone's problem if their scheme doesn't work as intended.*
where do you live, in a fairytale world where comic book legal logic prevails? of course it's illegal, probably goes under fraud too and depending on how it was done maybe some misuse of power or illegal telecommunications interception.
or perhaps you say that stolen calling cards are legal to use as well and that it's legal to use credit card numbers you found from google? and that shoplifting is legal if you just manage to get out of the store? and that hacking into a bank is legal since they put their computer on the internet and you only used public protocols? sorry but that kind of logic only gets you in jail where you'd belong if you did those things.
world was created 5 seconds before this post as it is.
Walm*rt may have an error in their central authorizing servers that's "confusing" redemption replies. Imagine a server that accepts requests from tens of thousands of different registers (probably a mainframe.) All those responses have to go back to the place they came from. What if a response was corrupted and an approval went back to a wrong register?
Or what if a request was corrupted? What if some stack corruption in their register changed a 12345 into a 22345, and they just happened to match a card issued elsewhere?
Or, what if the manufacturers screwed up and printed duplicate serial numbers on the backs of a batch of cards? Jane Doe goes to buy a card, but that serial number was already purchased by John Smith in a different state. If Jane's purchase request was made "offline", the card would be given to her immediately, but the card activation would have to be made after she left. Now, if Jane redeems her card, she uses John's value. Walm*rt would have no way to go back to Jane to say "Sorry, we gave you a bad card."
For these scenarios to work with a card being cashed within hours of being issued seems highly unlikely until you remember one thing: Walm*rt operates over 8000 stores, with probably over 200,000 POS registers, each of which is cranking through perhaps two or three hundred transactions a day. When you start factoring in just how many transactions might be corrupted, having a couple of "unlikely" coincidences seems more like a statistical certainty than a random chance.
John
But, what's wrong with China changing it's laws to better support their own people? If you are seriously suggesting that we stop using Chinese products then you'd better look around. In electronics, there's hardly any other choice. Why do you single out Walmart for this? Open your eyes and look in ANY other retail store.
.50 cents an hour.
The US simply can't compete with cheap labor like this so... We use it if they want to supply it.
Perhaps it would be better for these people to slave and die in the fields instead of becoming industrialized, but I'm not sure. Every nation that has gone through this process started this way - out of necessity.
Don't weep too uncontrolably for China. At the rate they're going their economy will soon dwarf the US. Pray that their governmental system changes before them or perhaps YOU will be working for
"...Well, there's egg and bacon; egg sausage and bacon; egg and spam; egg bacon and spam; egg bacon sausage and spam..."
Where one of the cards was empty in three hours the problem is within the control of Wal Mart. If the matter is considered as a glitch in the system and the cards just expire too fast, well that is one thing...an error that Wal Mart should have caught.
If there is an insider trading information (that could NEVER happen, right?) then security is way off and Wal Mart still loses.
If the system is open to outsiders to hack and they have the ability to grab the latest cards purchased and burn data and make purchases within three hours then the system is way too open.
People who pull off these scams aren't interested in most goods - they want cash. I suppose that the easiest method is to buy a case or 10 of cigarettes or to try to return a high-dollar item. The former can be sold almost anywhere and the latter will give the thief cash, but only after a second pass at the Wal Mart chain. The latter is a high-risk approach and it isn't consistent with an ongoing breach...
If only a few stories are out about these cards, but the breach of the cash control system is so complete that the funds can be diverted within three hours, then the problem is far more common and serious than Wal Mart wants to disclose. The system must have been compromised so thoroughly that only a complete replacement would eliminate the problem. Wal Mart data mines (last I read, they had the largest database of consumer purchases on the planet) and these cards are clearly an integral part of their data capture system. The cost of "fixing" the system must be far greater than the losses thus far. Of course, that could be hundreds of millions of dollars....
In that case, people were writing down the number of a card still on the shelf, or taking pictures of the bar code or something, and then noting what the sequence is (they are in order, after all) and then going home, and using the 1-800 number to see how much money was on the card to see when it was sold.
Once they found a number with money on it, they'd modify a card that they had (printing bar codes and reprogramming magnetic strips is easy) to have that number, and go and spend somebody else's money. Easy.
Seems easy enough to track, as 1-800 numbers include caller ID type info, so just see what number was called to check the balance of the card before it was depleted of funds, and if the same number shows up a few times, call the police ...
To make matters worse, the fine print basically said that this sort of loss was the customer's problem, not the retailer's. So the retailer was refusing to pay people for the lost money ...
In any event, giving a gift card sucks, even without this scam. It has *all* the tackiness of giving cash, but with the additional tackiness of telling you where you can spend this money. If you're going to buy me a present, buy me a present. If you want to give me cash, I certainly like cash. But don't spend cash on a gift card ... either use it to buy me something, or just give me the cash.
And if this does happen to you, scream bloody murder. Do not accept anything less than all the lost money, even if the fine print says that it's not their responsiblity. Call the local media if you have to. Make a scene in the store. Call the corporate office if you have to ... you'll probably eventually get your money.
Stored value cards are _NOT_ the same as debit cards, in many important respects. For one, the customer CANNOT get cash from the card.
Stored value cards are classed exactly the same as paper gift certificates, as that is what they are. (They are also subject to escheet laws in most states.)
I was part of a small team which created the first such card - Blockbusters - and am still amazed at how fast they've proliferated.
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