Support • (786) 621-8600 Contact us
Demo

Recent Posts

  • Home

Equifax Hackers Stole 200k Credit Card Accounts in One Fell Swoop

Visa and MasterCard are sending confidential alerts to financial institutions across the United States this week, warning them about more than 200,000 credit cards that were stolen in the epic data breach announced last week at big-three credit bureau Equifax. At first glance, the private notices obtained by KrebsOnSecurity appear to suggest that hackers initially breached Equifax starting in November 2016. But Equifax says the accounts were all stolen at the same time — when hackers accessed the company’s systems in mid-May 2017.

equifax-hq

Both Visa and MasterCard frequently send alerts to card-issuing financial institutions with information about specific credit and debit cards that may have been compromised in a recent breach. But it is unusual for these alerts to state from which company the accounts were thought to have been pilfered.

In this case, however, Visa and MasterCard were unambiguous, referring to Equifax specifically as the source of an e-commerce card breach.

In a non-public alert sent this week to sources at multiple banks, Visa said the “window of exposure” for the cards stolen in the Equifax breach was between Nov. 10, 2016 and July 6, 2017. A similar alert from MasterCard included the same date range.

“The investigation is ongoing and this information may be amended as new details arise,” Visa said in its confidential alert, linking to the press release Equifax initially posted about the breach on Sept. 7, 2017.

The card giant said the data elements stolen included card account number, expiration date, and the cardholder’s name. Fraudsters can use this information to conduct e-commerce fraud at online merchants.

It would be tempting to conclude from these alerts that the card breach at Equifax dates back to November 2016, and that perhaps the intruders then managed to install software capable of capturing customer credit card data in real-time as it was entered on one of Equifax’s Web sites.

Indeed, that was my initial hunch in deciding to report out this story. But according to a statement from Equifax, the hacker(s) downloaded the data in one fell swoop in mid-May 2017.

“The attacker accessed a storage table that contained historical credit card transaction related information,” the company said. “The dates that you provided in your e-mail appear to be the transaction dates. We have found no evidence during our investigation to indicate the presence of card harvesting malware, or access to the table before mid-May 2017.”

Equifax did not respond to questions about how it was storing credit card data, or why only card data collected from customers after November 2016 was stolen.

In its initial breach disclosure on Sept. 7, Equifax said it discovered the intrusion on July 29, 2017. The company said the hackers broke in through a vulnerability in the software that powers some of its Web-facing applications.

In an update to its breach disclosure published Wednesday evening, Equifax confirmed reports that the application flaw in question was a weakness disclosed in March 2017 in a popular open-source software package called Apache Struts (CVE-2017-5638)

“Equifax has been intensely investigating the scope of the intrusion with the assistance of a leading, independent cybersecurity firm to determine what information was accessed and who has been impacted,” the company wrote. “We know that criminals exploited a U.S. website application vulnerability. The vulnerability was Apache Struts CVE-2017-5638. We continue to work with law enforcement as part of our criminal investigation, and have shared indicators of compromise with law enforcement.”

The Apache flaw was first spotted around March 7, 2017, when security firms began warning that attackers were actively exploiting a “zero-day” vulnerability in Apache Struts. Zero-days refer to software or hardware flaws that hackers find and figure out how to use for commercial or personal gain before the vendor even knows about the bugs.

By March 8, Apache had released new versions of the software to mitigate the vulnerability. But by that time exploit code that would allow anyone to take advantage of the flaw was already published online — making it a race between companies needing to patch their Web servers and hackers trying to exploit the hole before it was closed.

Screen shots apparently taken on March 10, 2017 and later posted to the vulnerability tracking site xss[dot]cx indicate that the Apache Struts vulnerability was present at the time on annualcreditreport.com — the only web site mandated by Congress where all Americans can go to obtain a free copy of their credit reports from each of the three major bureaus annually.

In another screen shot apparently made that same day and uploaded to xss[dot]cx, we can see evidence that the Apache Struts flaw also was present in Experian’s Web properties.

Equifax has said the unauthorized access occurred from mid-May through July 2017, suggesting either that the company’s Web applications were still unpatched in mid-May or that the attackers broke in earlier but did not immediately abuse their access.

It remains unclear when exactly Equifax managed to fully eliminate the Apache Struts flaw from their various Web server applications. But one thing we do know for sure: The hacker(s) got in before Equifax closed the hole, and their presence wasn’t discovered until July 29, 2017.

Update, Sept. 15, 12:31 p.m. ET: Visa has updated their advisory about these 200,000+ credit cards stolen in the Equifax breach. Visa now says it believes the records also included the cardholder’s Social Security number and address, suggesting that (ironically enough) the accounts were stolen from people who were signing up for credit monitoring services through Equifax.

Equifax also clarified the breach timeline to note that it patched the Apache Struts flaw in its Web applications only after taking the hacked system(s) offline on July 30, 2017. Which means Equifax left its systems unpatched for more than four months after a patch (and exploit code to attack the flaw) was publicly available.

Source: KREBS ON SECURITY

Adobe, Microsoft Plug Critical Security Holes

Adobe and Microsoft both on Tuesday released patches to plug critical security vulnerabilities in their products. Microsoft’s patch bundles fix close to 80 separate security problems in various versions of its Windows operating system and related software — including two vulnerabilities that already are being exploited in active attacks. Adobe’s new version of its Flash Player software tackles two flaws that malware or attackers could use to seize remote control over vulnerable computers with no help from users.

brokenwindows

Of the two zero-day flaws being fixed this week, the one in Microsoft’s ubiquitous .NET Framework (CVE-2017-8759) is perhaps the most concerning. Despite this flaw being actively exploited, it is somehow labeled by Microsoft as “important” rather than “critical” — the latter being the most dire designation.

More than two dozen flaws Microsoft remedied with this patch batch come with a “critical” warning, which means they could be exploited without any assistance from Windows users — save for perhaps browsing to a hacked or malicious Web site.

Regular readers here probably recall that I’ve often recommended installing .NET updates separately from any remaining Windows updates, mainly because in past instances in which I’ve experienced problems installing Windows updates, a .NET patch was usually involved.

For the most part, Microsoft now bundles all security updates together in one big patch ball for regular home users — no longer letting people choose which patches to install. One exception is patches for the .NET Framework, and I stand by my recommendation to install the patch roll-ups separately, reboot, and then tackle the .NET updates. Your mileage may vary.

Another vulnerability Microsoft fixed addresses “BlueBorne” (CVE-2017-8628), which is a flaw in the Bluetooth wireless data transmission standard that attackers could use to snarf data from Bluetooth-enabled devices that are physically nearby and with Bluetooth turned on.

For more on this month’s Patch Tuesday from Microsoft, check out Microsoft’s security update guide, as well as this blog from Ivanti (formerly Shavlik).

brokenflash-aAdobe’s newest Flash version — v. 27.0.0.130 for Windows, Mac and Linx systems — corrects two critical bugs in Flash. For those of you who still have and want Adobe Flash Player installed in a browser, it’s time to update and/or restart your browser.

Windows users who browse the Web with anything other than Internet Explorer may need to apply the Flash patch twice, once with IE and again using the alternative browser (Firefox, Opera, e.g.).

Chrome and IE should auto-install the latest Flash version on browser restart (users may need to manually check for updates and/or restart the browser to get the latest Flash version). Chrome users may need to restart the browser to install or automatically download the latest version. When in doubt, click the vertical three dot icon to the right of the URL bar, select “Help,” then “About Chrome”: If there is an update available, Chrome should install it then. Chrome will replace that three dot icon with an up-arrow inside of a circle when updates are ready to install).

Better yet, consider removing or at least hobbling Flash Player, which is a perennial target of malware attacks. Most sites have moved away from requiring Flash, and Adobe itself is sunsetting this product (albeit not for another long two more years).

Windows users can get rid of Flash through the Add/Remove Programs menu, unless they’re using Chrome, which bundles its own version of Flash Player. To get to the Flash settings page, type or cut and paste “chrome://settings/content” into the address bar, and click on the Flash result.

Source: KREBS ON SECURITY

Ayuda! (Help!) Equifax Has My Data!

Equifax last week disclosed a historic breach involving Social Security numbers and other sensitive data on as many as 143 million Americans. The company said the breach also impacted an undisclosed number of people in Canada and the United Kingdom. But the official list of victim countries may not yet be complete: According to information obtained by KrebsOnSecurity, Equifax can safely add Argentina — if not also other Latin American nations where it does business — to the list as well.

equihaxEquifax is one of the world’s three-largest consumer credit reporting bureaus, and a big part of what it does is maintain records on consumers that businesses can use to learn how risky it might be to loan someone money or to extend them new lines of credit. On the flip side, Equifax is somewhat answerable to those consumers, who have a legal right to dispute any information in their credit report which may be inaccurate.

Earlier today, this author was contacted by Alex Holden, founder of Milwaukee, Wisc.-based Hold Security LLC. Holden’s team of nearly 30 employees includes two native Argentinians who spent some time examining Equifax’s South American operations online after the company disclosed the breach involving its business units in North America.

It took almost no time for them to discover that an online portal designed to let Equifax employees in Argentina manage credit report disputes from consumers in that country was wide open, protected by perhaps the most easy-to-guess password combination ever: “admin/admin.”

We’ll speak about this Equifax Argentina employee portal — known as Veraz or “truthful” in Spanish — in the past tense because the credit bureau took the whole thing offline shortly after being contacted by KrebsOnSecurity this afternoon. The specific Veraz application being described in this post was dubbed Ayuda or “help” in Spanish on internal documentation.

The landing page for the internal administration page of Equifax’s Veraz portal. Click to enlarge.

Once inside the portal, the researchers found they could view the names of more than 100 Equifax employees in Argentina, as well as their employee ID and email address. The “list of users” page also featured a clickable button that anyone authenticated with the “admin/admin” username and password could use to add, modify or delete user accounts on the system. A search on “Equifax Veraz” at Linkedin indicates the unit currently has approximately 111 employees in Argentina.

A partial list of active and inactive Equifax employees in Argentina. This page also let anyone add or remove users at will, or modify existing user accounts.

Each employee record included a company username in plain text, and a corresponding password that was obfuscated by a series of dots.

The “edit users” page obscured the Veraz employee’s password, but the same password was exposed by sloppy coding on the Web page.

However, all one needed to do in order to view said password was to right-click on the employee’s profile page and select “view source,” a function that displays the raw HTML code which makes up the Web site. Buried in that HTML code was the employee’s password in plain text.

A review of those accounts shows all employee passwords were the same as each user’s username. Worse still, each employee’s username appears to be nothing more than their last name, or a combination of their first initial and last name. In other words, if you knew an Equifax Argentina employee’s last name, you also could work out their password for this credit dispute portal quite easily.

But wait, it gets worse. From the main page of the Equifax.com.ar employee portal was a listing of some 715 pages worth of complaints and disputes filed by Argentinians who had at one point over the past decade contacted Equifax via fax, phone or email to dispute issues with their credit reports. The site also lists each person’s DNI — the Argentinian equivalent of the Social Security number — again, in plain text. All told, this section of the employee portal included more than 14,000 such records.

750 pages worth of consumer complaints — more than 14,000 in all — complete with the Argentinian equivalent of the SSN (the DNI) in plain text. This page was auto-translated by Google Chrome into English.

Jorge Speranza, manager of information technology at Hold Security, was born in Argentina and lived there for 40 years before moving to the United States. Speranza said he was aghast at seeing the personal data of so many Argentinians protected by virtually non-existent security.

Speranza explained that — unlike the United States — Argentina is traditionally a cash-based society that only recently saw citizens gaining access to credit.

“People there have put a lot of effort into getting a loan, and for them to have a situation like this would be a disaster,” he said. “In a country that has gone through so much — where there once was no credit, no mortgages or whatever — and now having the ability to get loans and lines of credit, this is potentially very damaging.”

Shortly after receiving details about this epic security weakness from Hold Security, I reached out to Equifax and soon after heard from a Washington, D.C.-based law firm that represents the credit bureau.

I briefly described what I’d been shown by Hold Security, and attorneys for Equifax said they’d get back to me after they validated the claims. They later confirmed that the Veraz portal was disabled and that Equifax is investigating how this may have happened. Here’s hoping it will stay offline until it is fortified with even the most basic of security protections.

According to Equifax’s own literature, the company has operations and consumer “customers” in several other South American nations, including Brazil, Chile, Ecuador, Paraguay, Peru and Uruguay. It is unclear whether the complete lack of security at Equifax’s Veraz unit in Argentina was indicative of a larger problem for the company’s online employee portals across the region, but it’s difficult to imagine they could be any worse.

“To me, this is just negligence,” Holden said. “In this case, their approach to security was just abysmal, and it’s hard to believe the rest of their operations are much better.”

I don’t have much advice for Argentinians whose data may have been exposed by sloppy security at Equifax. But I have urged my fellow Americans to assume their SSN and other personal data was compromised in the breach and to act accordingly. On Monday, KrebsOnSecurity published a Q&A about the breach, which includes all the information you need to know about this incident, as well as detailed advice for how to protect your credit file from identity thieves.

[Author’s note: I am listed as an adviser to Hold Security on the company’s Web site. However this is not a role for which I have been compensated in any way now or in the past.]

Source: KREBS ON SECURITY

The Equifax Breach: What You Should Know

It remains unclear whether those responsible for stealing Social Security numbers and other data on as many as 143 million Americans from big-three credit bureau Equifax intend to sell this data to identity thieves. But if ever there was a reminder that you — the consumer — are ultimately responsible for protecting your financial future, this is it. Here’s what you need to know and what you should do in response to this unprecedented breach.

Some of the Q&As below were originally published in a 2015 story, How I Learned to Stop Worrying and Embrace the Security Freeze. It has been updated to include new information specific to the Equifax intrusion.

Q: What information was jeopardized in the breach?

A: Equifax was keen to point out that its investigation is ongoing. But for now, the data at risk includes Social Security numbers, birth dates, addresses on 143 million Americans. Equifax also said the breach involved some driver’s license numbers (although it didn’t say how many or which states might be impacted), credit card numbers for roughly 209,000 U.S. consumers, and “certain dispute documents with personal identifying information for approximately 182,000 U.S. consumers.”

Q: Was the breach limited to Americans?

A: No. Equifax said it believes the intruders got access to “limited personal information for certain UK and Canadian residents.” It has not disclosed what information for those residents was at risk or how many from Canada and the UK may be impacted.

Q: What is Equifax doing about this breach?

A: Equifax is offering one free year of their credit monitoring service. In addition, it has put up a Web site — www.equifaxsecurity2017.com — that tried to let people determine whether they were affected.

Q: That site tells me I was not affected by the breach. Am I safe?

A: As noted in this story from Friday, the site seems hopelessly broken, often returning differing results for the same data submitted at different times. In the absence of more reliable information from Equifax, it is safer to assume you ARE compromised.

Q: I read that the legal language in the terms of service that consumers must accept before enrolling in the free credit monitoring service from Equifax requires one to waive their rights to sue the company in connection with this breach. Is that true?

A: Not according to Equifax. The company issued a statement over the weekend saying that nothing in that agreement applies to this cybersecurity incident.

Q: So should I take advantage of the credit monitoring offer?

A: It can’t hurt, but I wouldn’t count on it protecting you from identity theft.

Q: Wait, what? I thought that was the whole point of a credit monitoring service?

A: The credit bureaus sure want you to believe that, but it’s not true in practice. These services do not prevent thieves from using your identity to open new lines of credit, and from damaging your good name for years to come in the process. The most you can hope for is that credit monitoring services will alert you soon after an ID thief does steal your identity.

Q: Well then what the heck are these services good for?

A: Credit monitoring services are principally useful in helping consumers recover from identity theft. Doing so often requires dozens of hours writing and mailing letters, and spending time on the phone contacting creditors and credit bureaus to straighten out the mess. In cases where identity theft leads to prosecution for crimes committed in your name by an ID thief, you may incur legal costs as well. Most of these services offer to reimburse you up to a certain amount for out-of-pocket expenses related to those efforts. But a better solution is to prevent thieves from stealing your identity in the first place.

Q: What’s the best way to do that?

A: File a security freeze — also known as a credit freeze — with the four major credit bureaus.

Q: What is a security freeze?

A: A security freeze essentially blocks any potential creditors from being able to view or “pull” your credit file, unless you affirmatively unfreeze or thaw your file beforehand. With a freeze in place on your credit file, ID thieves can apply for credit in your name all they want, but they will not succeed in getting new lines of credit in your name because few if any creditors will extend that credit without first being able to gauge how risky it is to loan to you (i.e., view your credit file). And because each credit inquiry caused by a creditor has the potential to lower your credit score, the freeze also helps protect your score, which is what most lenders use to decide whether to grant you credit when you truly do want it and apply for it.

Q: What’s involved in freezing my credit file?

A: Freezing your credit involves notifying each of the major credit bureaus that you wish to place a freeze on your credit file. This can usually be done online, but in a few cases you may need to contact one or more credit bureaus by phone or in writing. Once you complete the application process, each bureau will provide a unique personal identification number (PIN) that you can use to unfreeze or “thaw” your credit file in the event that you need to apply for new lines of credit sometime in the future. Depending on your state of residence and your circumstances, you may also have to pay a small fee to place a freeze at each bureau. There are four consumer credit bureaus, including EquifaxExperianInnovis and Trans Union.  It’s a good idea to keep your unfreeze PIN(s) in a folder in a safe place (perhaps along with your latest credit report), so that when and if you need to undo the freeze, the process is simple.

Q: How much is the fee, and how can I know whether I have to pay it?

A: The fee ranges from $0 to $15 per bureau, meaning that it can cost upwards of $60 to place a freeze at all four credit bureaus (recommended). However, in most states, consumers can freeze their credit file for free at each of the major credit bureaus if they also supply a copy of a police report and in some cases an affidavit stating that the filer believes he/she is or is likely to be the victim of identity theft. In many states, that police report can be filed and obtained online. The fee covers a freeze as long as the consumer keeps it in place. Consumers Union has a useful breakdown of state-by-state fees.

Q: But what if I need to apply for a loan, or I want to take advantage of a new credit card offer?

A: You thaw the freeze temporarily (in most cases the default is for 24 hours).

Q: What’s involved in thawing my credit file? And do I need to thaw it at all three bureaus?

A: The easiest way to unfreeze your file for the purposes of gaining new credit is to spend a few minutes the phone with the company from which you hope to gain the line of credit (or research the matter online) to see which credit bureau they rely upon for credit checks. It will most likely be one of the major bureaus. Once you know which bureau the creditor uses, contact that bureau either via phone or online and supply the PIN they gave you when you froze your credit file with them. The thawing process should not take more than 24 hours, but hiccups in the thawing process sometimes make things take longer. It’s best not to wait until the last minute to thaw your file.

Q: It seems that credit bureaus make their money by selling data about me as a consumer to marketers. Does a freeze prevent that?

A: A freeze on your file does nothing to prevent the bureaus from collecting information about you as a consumer — including your spending habits and preferences — and packaging, splicing and reselling that information to marketers.

Q: Can I still use my credit or debit cards after I file a freeze? 

A: Yes. A freeze does nothing to prevent you from using existing lines of credit you may have.

Q: I’ve heard about something called a fraud alert. What’s the difference between a security freeze and a fraud alert on my credit file?

A: With a fraud alert on your credit file, lenders or service providers should not grant credit in your name without first contacting you to obtain your approval — by phone or whatever other method you specify when you apply for the fraud alert. To place a fraud alert, merely contact one of the credit bureaus via phone or online, fill out a short form, and answer a handful of multiple-choice, out-of-wallet questions about your credit history. Assuming the application goes through, the bureau you filed the alert with must by law share that alert with the other bureaus.

Consumers also can get an extended fraud alert, which remains on your credit report for seven years. Like the free freeze, an extended fraud alert requires a police report or other official record showing that you’ve been the victim of identity theft.

An active duty alert is another alert available if you are on active military duty. The active duty alert is similar to an initial fraud alert except that it lasts 12 months and your name is removed from pre-approved firm offers of credit or insurance (prescreening) for 2 years.

Q: Why would I pay for a security freeze when a fraud alert is free?

A: Fraud alerts only last for 90 days, although you can renew them as often as you like. More importantly, while lenders and service providers are supposed to seek and obtain your approval before granting credit in your name if you have a fraud alert on your file, they are not legally required to do this — and very often don’t.

Q: Hang on: If I thaw my credit file after freezing it so that I can apply for new lines of credit, won’t I have to pay to refreeze my file at the credit bureau where I thawed it?

A: It depends on your state. Some states allow bureaus to charge $5 for a temporary thaw or a lift on a freeze; in other states there is no fee for a thaw or lift. However, even if you have to do this once or twice a year, the cost of doing so is almost certainly less than paying for a year’s worth of credit monitoring services. Again, Consumers Union has a handy state-by-state guide listing the freeze and unfreeze laws and fees.

Q: What about my kids? Should I be freezing their files as well? Is that even possible? 

A: Depends on your state. Roughly half of the U.S. states have laws on the books allowing freezes for dependents. Check out The Lowdown on Freezing Your Kid’s Credit for more information.

Q: Is there anything I should do in addition to placing a freeze that would help me get the upper hand on ID thieves?

A: Yes: Periodically order a free copy of your credit report. By law, each of the three major credit reporting bureaus must provide a free copy of your credit report each year — via a government-mandated site: annualcreditreport.com. The best way to take advantage of this right is to make a notation in your calendar to request a copy of your report every 120 days, to review the report and to report any inaccuracies or questionable entries when and if you spot them. Avoid other sites that offer “free” credit reports and then try to trick you into signing up for something else.

Q: I just froze my credit. Can I still get a copy of my credit report from annualcreditreport.com? 

A: According to the Federal Trade Commission, having a freeze in place should not affect a consumer’s ability to obtain copies of their credit report from annualcreditreport.com.

Q: If I freeze my file, won’t I have trouble getting new credit going forward? 

A: If you’re in the habit of applying for a new credit card each time you see a 10 percent discount for shopping in a department store, a security freeze may cure you of that impulse. Other than that, as long as you already have existing lines of credit (credit cards, loans, etc) the credit bureaus should be able to continue to monitor and evaluate your creditworthiness should you decide at some point to take out a new loan or apply for a new line of credit.

Q: Can I have a freeze AND credit monitoring? 

A: Yes, you can. However, it may not be possible to sign up for credit monitoring services while a freeze is in place. My advice is to sign up for whatever credit monitoring may be offered for free, and then put the freezes in place.

Q: Beyond this breach, how would I know who is offering free credit monitoring? 

A: Hundreds of companies — many of which you have probably transacted with at some point in the last year — have disclosed data breaches and are offering free monitoring. California maintains one of the most comprehensive lists of companies that disclosed a breach, and most of those are offering free monitoring.

Q: I see that Trans Union has a free offering. And it looks like they offer another free service called a credit lock. Why shouldn’t I just use that?

A: I haven’t used that monitoring service, but it looks comparable to others. However, I take strong exception to the credit bureaus’ increasing use of the term “credit lock” to steer people away from securing a freeze on their file. I notice that Trans Union currently does this when consumers attempt to file a freeze. Your mileage may vary, but their motives for saddling consumers with even more confusing terminology are suspect. I would not count on a credit lock to take the place of a credit freeze, regardless of what these companies claim (consider the source).

Q: I read somewhere that the PIN code Equifax gives to consumers for use in the event they need to thaw a freeze at the bureau is little more than a date and time stamp of the date and time when the freeze was ordered. Is this correct? 

A: Yes. However, this does not appear to be the case with the other bureaus.

Q: Does this make the process any less secure? 

A: Hard to say. An identity thief would need to know the exact time your report was ordered. Unless of course Equifax somehow allowed attackers to continuously guess and increment that number through its Web site (there is no indication this is the case). However, having a freeze is still more secure than not having one.

Q: Someone told me that having a freeze in place wouldn’t block ID thieves from fraudulently claiming a tax refund in my name with the IRS, or conducting health insurance fraud using my SSN. Is this true?

A: Yes. There are several forms of identity theft that probably will not be blocked by a freeze. But neither will they be blocked by a fraud alert or a credit lock. That’s why it’s so important to regularly review your credit file with the major bureaus for any signs of unauthorized activity.

Q: Okay, I’ve got a security freeze on my file, what else should I do?

A: It’s also a good idea to notify a company called ChexSystems to keep an eye out for fraud committed in your name. Thousands of banks rely on ChexSystems to verify customers that are requesting new checking and savings accounts, and ChexSystems lets consumers place a security alert on their credit data to make it more difficult for ID thieves to fraudulently obtain checking and savings accounts. For more information on doing that with ChexSystems, see this link

Q: Anything else?

A: ID thieves like to intercept offers of new credit and insurance sent via postal mail, so it’s a good idea to opt out of pre-approved credit offers. If you decide that you don’t want to receive prescreened offers of credit and insurance, you have two choices: You can opt out of receiving them for five years or opt out of receiving them permanently.

To opt out for five years: Call toll-free 1-888-5-OPT-OUT (1-888-567-8688) or visit www.optoutprescreen.com. The phone number and website are operated by the major consumer reporting companies.

To opt out permanently: You can begin the permanent Opt-Out process online at www.optoutprescreen.com. To complete your request, you must return the signed Permanent Opt-Out Election form, which will be provided after you initiate your online request. 

Source: KREBS ON SECURITY