Entries Tagged "computer security"

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Wired on Identity Theft

This is a good editorial from Wired on identity theft.

Following are the fixes we think Congress should make:

Require businesses to secure data and levy fines against those who don’t. Congress has mandated tough privacy and security standards for companies that handle health and financial data. But the rules for credit agencies are woefully inadequate. And they don’t cover other businesses and organizations that handle sensitive personal information, such as employers, academic institutions and data brokers. Congress should mandate strict privacy and security standards for anyone who handles sensitive information, and apply tough financial penalties against companies that fail to comply.

Require companies to encrypt all sensitive customer data. Any standard created to protect data should include technical requirements to scramble the data—both in storage and during transit when data is transferred from one place to another. Recent incidents involving unencrypted Bank of America and CitiFinancial data tapes that went missing while being transferred to backup centers make it clear that companies think encryption is necessary only in certain circumstances.

Keep the plan simple and provide authority and funds to the FTC to ensure legislation is enforced. Efforts to secure sensitive data in the health and financial industries led to laws so complicated and confusing that few have been able to follow them faithfully. And efforts to monitor compliance have been inadequate. Congress should develop simpler rules tailored to each specific industry segment, and give the FTC the necessary funding to enforce them.

Keep Social Security numbers for Social Security. Social Security numbers appear on medical and voter-registration forms as well as on public records that are available through a simple internet search. This makes it all too easy for a thief to obtain the single identifying number that can lead to financial ruin for victims. Americans need a different unique identifying number specifically for credit records, with guarantees that it will never be used for authentication purposes.

Force credit agencies to scrutinize credit-card applications and verify the identity of credit-card applicants. Giving Americans easy access to credit has superseded all other considerations in the cutthroat credit-card business, helping thieves open accounts in victims’ names. Congress needs to bring sane safeguards back into the process of approving credit—even if it means adding costs and inconveniencing powerful banking and financial interests.

Extend fraud alerts beyond 90 days. The Fair Credit Reporting Act allows anyone who suspects that their personal information has been stolen to place a fraud alert on their credit record. This currently requires a creditor to take “reasonable” steps to verify the identity of anyone who applies for credit in the individual’s name. It also requires the creditor to contact the individual who placed the fraud alert on the account if they’ve provided their phone number. Both conditions apply for 90 days. Of course, nothing prevents identity thieves from waiting until the short-lived alert period expires before taking advantage of stolen information. Congress should extend the default window for credit alerts to a minimum of one year.

Allow individuals to freeze their credit records so that no one can access the records without the individuals’ approval. The current credit system opens credit reports to almost anyone who requests them. Individuals should be able to “freeze” their records and have them opened to others only when the individual contacts a credit agency and requests that it release a report to a specific entity.

Require opt-in rather than opt-out permission before companies can share or sell data. Many businesses currently allow people to decline inclusion in marketing lists, but only if customers actively request it. This system, known as opt-out, inherently favors companies by making it more difficult for consumers to escape abusive data-sharing practices. In many cases, consumers need to wade through confusing instructions, and send a mail-in form in order to be removed from pre-established marketing lists. The United States should follow an opt-in model, where companies would be forced to collect permission from individuals before they can traffic in personal data.

Require companies to notify consumers of any privacy breaches, without preventing states from enacting even tougher local laws. Some 37 states have enacted or are considering legislation requiring businesses to notify consumers of data breaches that affect them. A similar federal measure has also been introduced in the Senate. These are steps in the right direction. But the federal bill has a major flaw: It gives companies an easy out in the case of massive data breaches, where the number of people affected exceeds 500,000, or the cost of notification would exceeds $250,000. In those cases, companies would not be required to notify individuals, but could comply simply by posting a notice on their websites. Congress should close these loopholes. In addition, any federal law should be written to ensure that it does not pre-empt state notification laws that take a tougher stance.

As I’ve written previously, this won’t solve identity theft. But it will make it harder and protect the privacy of everyone. These are good recommendations.

Posted on June 29, 2005 at 7:18 AM • View Comments

Interview with Marcus Ranum

There’s some good stuff in this interview.

There’s enough blame for everyone.

Blame the users who don’t secure their systems and applications.

Blame the vendors who write and distribute insecure shovel-ware.

Blame the sleazebags who make their living infecting innocent people with spyware, or sending spam.

Blame Microsoft for producing an operating system that is bloated and has an ineffective permissions model and poor default configurations.

Blame the IT managers who overrule their security practitioners’ advice and put their systems at risk in the interest of convenience. Etc.

Truly, the only people who deserve a complete helping of blame are the hackers. Let’s not forget that they’re the ones doing this to us. They’re the ones who are annoying an entire planet. They’re the ones who are costing us billions of dollars a year to secure our systems against them. They’re the ones who place their desire for fun ahead of everyone on earth’s desire for peace and [the] right to privacy.

Posted on June 27, 2005 at 1:14 PM • View Comments

Underhanded C Contest

As far as I know, this is the only security-related programming contest: the Underhanded C Contest. The object is to write clear, readable C code with hidden malicious behavior; in other words, to hide evil stuff in code that passes visual inspection of source by other programmers.

This year’s challenge: covert fingerprinting.

Posted on June 21, 2005 at 12:34 PM • View Comments

Defining "Access" in Cyberspace

I’ve been reading a lot of law journal articles. It’s interesting to read legal analyses of some of the computer security problems I’ve been wrestling with.

This is a fascinating paper on the concepts of “access” and “authorized access” in cyberspace. The abstract:

In the last twenty-five years, the federal government and all fifty states have enacted new criminal laws that prohibit unauthorized access to computers. These new laws attempt to draw a line between criminality and free conduct in cyberspace. No one knows what it means to access a computer, however, nor when access becomes unauthorized. The few courts that have construed these terms have offered divergent interpretations, and no scholars have yet addressed the problem. Recent decisions interpreting the federal statute in civil cases suggest that any breach of contract with a computer owner renders use of that computer an unauthorized access. If applied to criminal cases, this approach would broadly criminalize contract law on the Internet, potentially making millions of Americans criminals for the way they write e-mail and surf the Web.

This Article presents a comprehensive inquiry into the meaning of unauthorized access statutes. It begins by explaining why legislatures enacted unauthorized access statutes, and why early beliefs that such statutes solved the problem of computer misuse have proved remarkably naïve. Next, the Article explains how the courts have construed these statutes in an overly broad way that threatens to criminalize a surprising range of innocuous conduct involving computers. In the final section, the Article offers a normative proposal for interpreting access and authorization. This section argues that courts should reject a contract theory of authorization, and should narrow the scope of unauthorized access statutes to circumvention of code-based restrictions on computer privileges. The section justifies this proposal on several grounds. First, the proposal will best mediate the line between securing privacy and protecting the liberty of Internet users. Second, the proposal mirrors criminal law’s traditional treatment of crimes that contain a consent element. Third, the proposed approach is consistent with the basic theories of punishment. Fourth, the proposed interpretation avoids possible constitutional difficulties that may arise under the broader constructions that courts recently have favored.

It’s a long paper, but I recommend reading it if you’re interested in the legal concepts.

Posted on June 14, 2005 at 7:16 AM • View Comments

Attack Trends: 2004 and 2005

Counterpane Internet Security, Inc., monitors more than 450 networks in 35 countries, in every time zone. In 2004 we saw 523 billion network events, and our analysts investigated 648,000 security “tickets.” What follows is an overview of what’s happening on the Internet right now, and what we expect to happen in the coming months.

In 2004, 41 percent of the attacks we saw were unauthorized activity of some kind, 21 percent were scanning, 26 percent were unauthorized access, 9 percent were DoS (denial of service), and 3 percent were misuse of applications.

Over the past few months, the two attack vectors that we saw in volume were against the Windows DCOM (Distributed Component Object Model) interface of the RPC (remote procedure call) service and against the Windows LSASS (Local Security Authority Subsystem Service). These seem to be the current favorites for virus and worm writers, and we expect this trend to continue.

The virus trend doesn’t look good. In the last six months of 2004, we saw a plethora of attacks based on browser vulnerabilities (such as GDI-JPEG image vulnerability and IFRAME) and an increase in sophisticated worm and virus attacks. More than 1,000 new worms and viruses were discovered in the last six months alone.

In 2005, we expect to see ever-more-complex worms and viruses in the wild, incorporating complex behavior: polymorphic worms, metamorphic worms, and worms that make use of entry-point obscuration. For example, SpyBot.KEG is a sophisticated vulnerability assessment worm that reports discovered vulnerabilities back to the author via IRC channels.

We expect to see more blended threats: exploit code that combines malicious code with vulnerabilities in order to launch an attack. We expect Microsoft’s IIS (Internet Information Services) Web server to continue to be an attractive target. As more and more companies migrate to Windows 2003 and IIS 6, however, we expect attacks against IIS to decrease.

We also expect to see peer-to-peer networking as a vector to launch viruses.

Targeted worms are another trend we’re starting to see. Recently there have been worms that use third-party information-gathering techniques, such as Google, for advanced reconnaissance. This leads to a more intelligent propagation methodology; instead of propagating scattershot, these worms are focusing on specific targets. By identifying targets through third-party information gathering, the worms reduce the noise they would normally make when randomly selecting targets, thus increasing the window of opportunity between release and first detection.

Another 2004 trend that we expect to continue in 2005 is crime. Hacking has moved from a hobbyist pursuit with a goal of notoriety to a criminal pursuit with a goal of money. Hackers can sell unknown vulnerabilities—”zero-day exploits”—on the black market to criminals who use them to break into computers. Hackers with networks of hacked machines can make money by selling them to spammers or phishers. They can use them to attack networks. We have started seeing criminal extortion over the Internet: hackers with networks of hacked machines threatening to launch DoS attacks against companies. Most of these attacks are against fringe industries—online gambling, online computer gaming, online pornography—and against offshore networks. The more these extortions are successful, the more emboldened the criminals will become.

We expect to see more attacks against financial institutions, as criminals look for new ways to commit fraud. We also expect to see more insider attacks with a criminal profit motive. Already most of the targeted attacks—as opposed to attacks of opportunity—originate from inside the attacked organization’s network.

We also expect to see more politically motivated hacking, whether against countries, companies in “political” industries (petrochemicals, pharmaceuticals, etc.), or political organizations. Although we don’t expect to see terrorism occur over the Internet, we do expect to see more nuisance attacks by hackers who have political motivations.

The Internet is still a dangerous place, but we don’t foresee people or companies abandoning it. The economic and social reasons for using the Internet are still far too compelling.

This essay originally appeared in the June 2005 issue of Queue.

Posted on June 6, 2005 at 1:02 PM • View Comments

Attack on the Bluetooth Pairing Process

There’s a new cryptographic result against Bluetooth. Yaniv Shaked and Avishai Wool of Tel Aviv University in Israel have figured out how to recover the PIN by eavesdropping on the pairing process.

Pairing is an important part of Bluetooth. It’s how two devices—a phone and a headset, for example—associate themselves with one another. They generate a shared secret that they use for all future communication. Pairing is why, when on a crowded subway, your Bluetooth devices don’t link up with all the other Bluetooth devices carried by everyone else.

According to the Bluetooth specification, PINs can be 8-128 bits long. Unfortunately, most manufacturers have standardized on a four decimal-digit PIN. This attack can crack that 4-digit PIN in less than 0.3 sec on an old Pentium III 450MHz computer, and in 0.06 sec on a Pentium IV 3Ghz HT computer.

At first glance, this attack isn’t a big deal. It only works if you can eavesdrop on the pairing process. Pairing is something that occurs rarely, and generally in the safety of your home or office. But the authors have figured out how to force a pair of Bluetooth devices to repeat the pairing process, allowing them to eavesdrop on it. They pretend to be one of the two devices, and send a message to the other claiming to have forgotten the link key. This prompts the other device to discard the key, and the two then begin a new pairing session.

Taken together, this is an impressive result. I can’t be sure, but I believe it would allow an attacker to take control of someone’s Bluetooth devices. Certainly it allows an attacker to eavesdrop on someone’s Bluetooth network.

News story here.

Posted on June 3, 2005 at 10:19 AM • View Comments

Major Israeli Computer Espionage Case

This is a fascinating story of computer espionage.

Dozens of leading companies and top private investigators were named yesterday as suspects in a massive industrial espionage investigation that local police have been conducting for the past six months.

The companies suspected of commissioning the espionage, which was carried out by planting Trojan horse software in their competitors’ computers, include the satellite television company Yes, which is suspected of spying on cable television company HOT; cell-phone companies Pelephone and Cellcom, suspected of spying on their mutual rival Partner; and Mayer, which imports Volvos and Hondas to Israel and is suspected of spying on Champion Motors, importer of Audis and Volkswagens. Spy programs were also located in the computers of major companies such as Strauss-Elite, Shekem Electric and the business daily Globes.

Read the whole story; it’s filled with interesting details. To me, the most interesting is that even though the Trojan was installed on computers at dozens of Israel’s top companies, it was discovered only because the Trojan writer also used it to spy after his ex-in-laws.

There’s a lesson here for all computer criminals.

Edited to add: Much more information here.

Posted on May 31, 2005 at 7:17 AM • View Comments

Holding Computer Files Hostage

This one has been predicted for years. Someone breaks into your network, encrypts your data files, and then demands a ransom to hand over the key.

I don’t know how the attackers did it, but below is probably the best way. A worm could be programmed to do it.

1. Break into a computer.

2. Generate a random 256-bit file-encryption key.

3. Encrypt the file-encryption key with a common RSA public key.

4. Encrypt data files with the file-encryption key.

5. Wipe data files and file-encryption key.

6. Wipe all free space on the drive.

7. Output a file containing the RSA-encrypted, file encryption key.

8. Demand ransom.

9. Receive ransom.

10. Receive encrypted file-encryption key.

11. Decrypt it and send it back.

In any situation like this, step 9 is the hardest. It’s where you’re most likely to get caught. I don’t know much about anonymous money transfer, but I don’t think Swiss bank accounts have the anonymity they used to.

You also might have to prove that you can decrypt the data, so an easy modification is to encrypt a piece of the data with another file-encryption key so you can prove to the victim that you have the RSA private key.

Internet attacks have changed over the last couple of years. They’re no longer about hackers. They’re about criminals. And we should expect to see more of this sort of thing in the future.

Posted on May 30, 2005 at 8:18 AM • View Comments

Insider Threats

CERT (at Carnegie Mellon) just released a study on insider threats. They analyze 49 insider attacks between 1996 and 2002, and draw some conclusions about the attacks and attackers. Nothing about the prevalence of these attacks, and more about the particulars of them.

The report is mostly obvious, and isn’t worth more than a skim. But the particular methodology only tells part of the story.

Because the study focuses on insider attacks on information systems rather than attacks using information systems, it’s primarily about destructive acts. Of course the major motive is going to be revenge against the employer.

Near as I can tell, the report ignores attacks that use information systems to otherwise benefit the attacker. These attacks would include embezzlement—which at a guess is much more common than revenge.

The report also doesn’t seem to acknowledge that the researchers are only looking at attacks that were noticed. I’m not impressed by the fact that most of the attackers got caught, since those are the ones that were noticed. This reinforces the same bias: network disruption is far more noticeable than theft.

These are worrisome threats, but I’d be more concerned about insider attacks that aren’t nearly so obvious.

Still, there are some interesting statistics about those who use information systems to get back at their employers.

For example of the latter, the study’s “executive summary” notes that in 62 percent of the cases, “a negative work-related event triggered most of the insiders’ actions.” The study also found that 82 percent of the time the people who hacked their company “exhibited unusual behavior in the workplace prior to carrying out their activities.” The survey surmises that’s probably because the insiders were angry at someone they worked with or for: 84 percent of attacks were motivated by a desire to seek revenge, and in 85 percent of the cases the insider had a documented grievance against their employer or a co-worker….

Some other interesting (although not particularly surprising) tidbits: Almost all—96 percent—of the insiders were men, and 30 percent of them had previously been arrested, including arrests for violent offenses (18 percent), alcohol or drug-related offenses (11 percent), and non-financial-fraud related theft offenses (11 percent).

Posted on May 18, 2005 at 9:28 AM • View Comments

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Sidebar photo of Bruce Schneier by Joe MacInnis.