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New Report on Police Digital Forensics Techniques

According to a new CSIS report, “going dark” is not the most pressing problem facing law enforcement in the age of digital data:

Over the past year, we conducted a series of interviews with federal, state, and local law enforcement officials, attorneys, service providers, and civil society groups. We also commissioned a survey of law enforcement officers from across the country to better understand the full range of difficulties they are facing in accessing and using digital evidence in their cases. Survey results indicate that accessing data from service providers — much of which is not encrypted — is the biggest problem that law enforcement currently faces in leveraging digital evidence.

This is a problem that has not received adequate attention or resources to date. An array of federal and state training centers, crime labs, and other efforts have arisen to help fill the gaps, but they are able to fill only a fraction of the need. And there is no central entity responsible for monitoring these efforts, taking stock of the demand, and providing the assistance needed. The key federal entity with an explicit mission to assist state and local law enforcement with their digital evidence needs­ — the National Domestic Communications Assistance Center (NDCAC)­has a budget of $11.4 million, spread among several different programs designed to distribute knowledge about service providers’ poli­cies and products, develop and share technical tools, and train law enforcement on new services and tech­nologies, among other initiatives.

From a news article:

In addition to bemoaning the lack of guidance and help from tech companies — a quarter of survey respondents said their top issue was convincing companies to hand over suspects’ data — law enforcement officials also reported receiving barely any digital evidence training. Local police said they’d received only 10 hours of training in the past 12 months; state police received 13 and federal officials received 16. A plurality of respondents said they only received annual training. Only 16 percent said their organizations scheduled training sessions at least twice per year.

This is a point that Susan Landau has repeatedly made, and also one I make in my new book. The FBI needs technical expertise, not backdoors.

Here’s the report.

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Router Vulnerability and the VPNFilter Botnet

On May 25, the FBI asked us all to reboot our routers. The story behind this request is one of sophisticated malware and unsophisticated home-network security, and it’s a harbinger of the sorts of pervasive threats ­ from nation-states, criminals and hackers ­ that we should expect in coming years.

VPNFilter is a sophisticated piece of malware that infects mostly older home and small-office routers made by Linksys, MikroTik, Netgear, QNAP and TP-Link. (For a list of specific models, click here.) It’s an impressive piece of work. It can eavesdrop on traffic passing through the router ­ specifically, log-in credentials and SCADA traffic, which is a networking protocol that controls power plants, chemical plants and industrial systems ­ attack other targets on the Internet and destructively “kill” its infected device. It is one of a very few pieces of malware that can survive a reboot, even though that’s what the FBI has requested. It has a number of other capabilities, and it can be remotely updated to provide still others. More than 500,000 routers in at least 54 countries have been infected since 2016.

Because of the malware’s sophistication, VPNFilter is believed to be the work of a government. The FBI suggested the Russian government was involved for two circumstantial reasons. One, a piece of the code is identical to one found in another piece of malware, called BlackEnergy, that was used in the December 2015 attack against Ukraine’s power grid. Russia is believed to be behind that attack. And two, the majority of those 500,000 infections are in Ukraine and controlled by a separate command-and-control server. There might also be classified evidence, as an FBI affidavit in this matter identifies the group behind VPNFilter as Sofacy, also known as APT28 and Fancy Bear. That’s the group behind a long list of attacks, including the 2016 hack of the Democratic National Committee.

Two companies, Cisco and Symantec, seem to have been working with the FBI during the past two years to track this malware as it infected ever more routers. The infection mechanism isn’t known, but we believe it targets known vulnerabilities in these older routers. Pretty much no one patches their routers, so the vulnerabilities have remained, even if they were fixed in new models from the same manufacturers.

On May 30, the FBI seized control of toknowall.com, a critical VPNFilter command-and-control server. This is called “sinkholing,” and serves to disrupt a critical part of this system. When infected routers contact toknowall.com, they will no longer be contacting a server owned by the malware’s creators; instead, they’ll be contacting a server owned by the FBI. This doesn’t entirely neutralize the malware, though. It will stay on the infected routers through reboot, and the underlying vulnerabilities remain, making the routers susceptible to reinfection with a variant controlled by a different server.

If you want to make sure your router is no longer infected and cannot be reinfected, you need to do more than reboot your router, the FBI’s warning notwithstanding. You need to reset the router to its factory settings. That means you need to reconfigure it for your network, which can be a pain if you’re not sophisticated in these matters. If you want to make sure your router cannot be reinfected, you need to update the firmware with any security patches from the manufacturer. This is harder to do and may strain your technical capabilities, though it’s ridiculous that routers don’t automatically download and install firmware updates on their own. Some of these models probably do not even have security patches available. Honestly, the best thing to do if you have one of the vulnerable models is to throw it away and get a new one. (Your ISP will probably send you a new one free if you claim that it’s not working properly. And you should have a new one, because if your current one is on the list, it’s at least 10 years old.)

So if it won’t clear out the malware, why is the FBI asking us to reboot our routers? It’s mostly just to get a sense of how bad the problem is. The FBI now controls toknowall.com. When an infected router gets rebooted, it connects to that server to get fully reinfected, and when it does, the FBI will know. Rebooting will give it a better idea of how many devices out there are infected.

Should you do it? It can’t hurt.

Internet of Things malware isn’t new. The 2016 Mirai botnet, for example, created by a lone hacker and not a government, targeted vulnerabilities in Internet-connected digital video recorders and webcams. Other malware has targeted Internet-connected thermostats. Lots of malware targets home routers. These devices are particularly vulnerable because they are often designed by ad hoc teams without a lot of security expertise, stay around in networks far longer than our computers and phones, and have no easy way to patch them.

It wouldn’t be surprising if the Russians targeted routers to build a network of infected computers for follow-on cyber operations. I’m sure many governments are doing the same. As long as we allow these insecure devices on the Internet ­ and short of security regulations, there’s no way to stop them ­ we’re going to be vulnerable to this kind of malware.

And next time, the command-and-control server won’t be so easy to disrupt.

This essay previously appeared in the Washington Post

EDITED TO ADD: The malware is more capable than we previously thought.

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Cellebrite Unlocks iPhones for the US Government

Forbes reports that the Israeli company Cellebrite can probably unlock all iPhone models:

Cellebrite, a Petah Tikva, Israel-based vendor that’s become the U.S. government’s company of choice when it comes to unlocking mobile devices, is this month telling customers its engineers currently have the ability to get around the security of devices running iOS 11. That includes the iPhone X, a model that Forbes has learned was successfully raided for data by the Department for Homeland Security back in November 2017, most likely with Cellebrite technology.

[…]

It also appears the feds have already tried out Cellebrite tech on the most recent Apple handset, the iPhone X. That’s according to a warrant unearthed by Forbes in Michigan, marking the first known government inspection of the bleeding edge smartphone in a criminal investigation. The warrant detailed a probe into Abdulmajid Saidi, a suspect in an arms trafficking case, whose iPhone X was taken from him as he was about to leave America for Beirut, Lebanon, on November 20. The device was sent to a Cellebrite specialist at the DHS Homeland Security Investigations Grand Rapids labs and the data extracted on December 5.

This story is based on some excellent reporting, but leaves a lot of questions unanswered. We don’t know exactly what was extracted from any of the phones. Was it metadata or data, and what kind of metadata or data was it.

The story I hear is that Cellebrite hires ex-Apple engineers and moves them to countries where Apple can’t prosecute them under the DMCA or its equivalents. There’s also a credible rumor that Cellebrite’s mechanisms only defeat the mechanism that limits the number of password attempts. It does not allow engineers to move the encrypted data off the phone and run an offline password cracker. If this is true, then strong passwords are still secure.

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E-Mail Leaves an Evidence Trail

If you’re going to commit an illegal act, it’s best not to discuss it in e-mail. It’s also best to Google tech instructions rather than asking someone else to do it:

One new detail from the indictment, however, points to just how unsophisticated Manafort seems to have been. Here’s the relevant passage from the indictment. I’ve bolded the most important bits:

Manafort and Gates made numerous false and fraudulent representations to secure the loans. For example, Manafort provided the bank with doctored [profit and loss statements] for [Davis Manafort Inc.] for both 2015 and 2016, overstating its income by millions of dollars. The doctored 2015 DMI P&L submitted to Lender D was the same false statement previously submitted to Lender C, which overstated DMI’s income by more than $4 million. The doctored 2016 DMI P&L was inflated by Manafort by more than $3.5 million. To create the false 2016 P&L, on or about October 21, 2016, Manafort emailed Gates a .pdf version of the real 2016 DMI P&L, which showed a loss of more than $600,000. Gates converted that .pdf into a “Word” document so that it could be edited, which Gates sent back to Manafort. Manafort altered that “Word” document by adding more than $3.5 million in income. He then sent this falsified P&L to Gates and asked that the “Word” document be converted back to a .pdf, which Gates did and returned to Manafort. Manafort then sent the falsified 2016 DMI P&L .pdf to Lender D.

So here’s the essence of what went wrong for Manafort and Gates, according to Mueller’s investigation: Manafort allegedly wanted to falsify his company’s income, but he couldn’t figure out how to edit the PDF. He therefore had Gates turn it into a Microsoft Word document for him, which led the two to bounce the documents back-and-forth over email. As attorney and blogger Susan Simpson notes on Twitter, Manafort’s inability to complete a basic task on his own seems to have effectively “created an incriminating paper trail.”

If there’s a lesson here, it’s that the Internet constantly generates data about what people are doing on it, and that data is all potential evidence. The FBI is 100% wrong that they’re going dark; it’s really the golden age of surveillance, and the FBI’s panic is really just its own lack of technical sophistication.

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Yet Another FBI Proposal for Insecure Communications

Deputy Attorney General Rosenstein has given talks where he proposes that tech companies decrease their communications and device security for the benefit of the FBI. In a recent talk, his idea is that tech companies just save a copy of the plaintext:

Law enforcement can also partner with private industry to address a problem we call “Going Dark.” Technology increasingly frustrates traditional law enforcement efforts to collect evidence needed to protect public safety and solve crime. For example, many instant-messaging services now encrypt messages by default. The prevent the police from reading those messages, even if an impartial judge approves their interception.

The problem is especially critical because electronic evidence is necessary for both the investigation of a cyber incident and the prosecution of the perpetrator. If we cannot access data even with lawful process, we are unable to do our job. Our ability to secure systems and prosecute criminals depends on our ability to gather evidence.

I encourage you to carefully consider your company’s interests and how you can work cooperatively with us. Although encryption can help secure your data, it may also prevent law enforcement agencies from protecting your data.

Encryption serves a valuable purpose. It is a foundational element of data security and essential to safeguarding data against cyber-attacks. It is critical to the growth and flourishing of the digital economy, and we support it. I support strong and responsible encryption.

I simply maintain that companies should retain the capability to provide the government unencrypted copies of communications and data stored on devices, when a court orders them to do so.

Responsible encryption is effective secure encryption, coupled with access capabilities. We know encryption can include safeguards. For example, there are systems that include central management of security keys and operating system updates; scanning of content, like your e-mails, for advertising purposes; simulcast of messages to multiple destinations at once; and key recovery when a user forgets the password to decrypt a laptop. No one calls any of those functions a “backdoor.” In fact, those very capabilities are marketed and sought out.

I do not believe that the government should mandate a specific means of ensuring access. The government does not need to micromanage the engineering.

The question is whether to require a particular goal: When a court issues a search warrant or wiretap order to collect evidence of crime, the company should be able to help. The government does not need to hold the key.

Rosenstein is right that many services like Gmail naturally keep plaintext in the cloud. This is something we pointed out in our 2016 paper: “Don’t Panic.” But forcing companies to build an alternate means to access the plaintext that the user can’t control is an enormous vulnerability.

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Susan Landau’s New Book: Listening In

Susan Landau has written a terrific book on cybersecurity threats and why we need strong crypto. Listening In: Cybersecurity in an Insecure Age. It’s based in part on her 2016 Congressional testimony in the Apple/FBI case; it examines how the Digital Revolution has transformed society, and how law enforcement needs to — and can — adjust to the new realities. The book is as accessible to techies and non-techies alike, and is strongly recommended.

And if you’ve already read it, give it a review on Amazon. Reviews sell books, and this one needs more of them.

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Daphne Caruana Galizia’s Murder and the Security of WhatsApp

Daphne Caruana Galizia was a Maltese journalist whose anti-corruption investigations exposed powerful people. She was murdered in October by a car bomb.

Galizia used WhatsApp to communicate securely with her sources. Now that she is dead, the Maltese police want to break into her phone or the app, and find out who those sources were.

One journalist reports:

Part of Daphne’s destroyed smart phone was elevated from the scene.

Investigators say that Caruana Galizia had not taken her laptop with her on that particular trip. If she had done so, the forensic experts would have found evidence on the ground.

Her mobile phone is also being examined, as can be seen from her WhatsApp profile, which has registered activity since the murder. But it is understood that the data is safe.

Sources close to the newsroom said that as part of the investigation her sim card has been cloned. This is done with the help of mobile service providers in similar cases. Asked if her WhatsApp messages or any other messages that were stored in her phone will be retrieved, the source said that since the messaging application is encrypted, the messages cannot be seen. Therefore it is unlikely that any data can be retrieved.

I am less optimistic than that reporter. The FBI is providing “specific assistance.” The article doesn’t explain that, but I would not be surprised if they were helping crack the phone.

It will be interesting to see if WhatsApp’s security survives this. My guess is that it depends on how much of the phone was recovered from the bombed car.

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FBI Increases Its Anti-Encryption Rhetoric

Earlier this month, Deputy Attorney General Rod Rosenstein gave a speech warning that a world with encryption is a world without law — or something like that. The EFF’s Kurt Opsahl takes it apart pretty thoroughly.

Last week, FBI Director Christopher Wray said much the same thing.

This is an idea that will not die.

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NSA Document Outlining Russian Attempts to Hack Voter Rolls

This week brought new public evidence about Russian interference in the 2016 election. On Monday, the Intercept published a top-secret National Security Agency document describing Russian hacking attempts against the US election system. While the attacks seem more exploratory than operational ­– and there’s no evidence that they had any actual effect ­– they further illustrate the real threats and vulnerabilities facing our elections, and they point to solutions.

The document describes how the GRU, Russia’s military intelligence agency, attacked a company called VR Systems that, according to its website, provides software to manage voter rolls in eight states. The August 2016 attack was successful, and the attackers used the information they stole from the company’s network to launch targeted attacks against 122 local election officials on October 27, 12 days before the election.

That is where the NSA’s analysis ends. We don’t know whether those 122 targeted attacks were successful, or what their effects were if so. We don’t know whether other election software companies besides VR Systems were targeted, or what the GRU’s overall plan was — if it had one. Certainly, there are ways to disrupt voting by interfering with the voter registration process or voter rolls. But there was no indication on Election Day that people found their names removed from the system, or their address changed, or anything else that would have had an effect — anywhere in the country, let alone in the eight states where VR Systems is deployed. (There were Election Day problems with the voting rolls in Durham, NC ­– one of the states that VR Systems supports ­– but they seem like conventional errors and not malicious action.)

And 12 days before the election (with early voting already well underway in many jurisdictions) seems far too late to start an operation like that. That is why these attacks feel exploratory to me, rather than part of an operational attack. The Russians were seeing how far they could get, and keeping those accesses in their pocket for potential future use.

Presumably, this document was intended for the Justice Department, including the FBI, which would be the proper agency to continue looking into these hacks. We don’t know what happened next, if anything. VR Systems isn’t commenting, and the names of the local election officials targeted did not appear in the NSA document.

So while this document isn’t much of a smoking gun, it’s yet more evidence of widespread Russian attempts to interfere last year.

The document was, allegedly, sent to the Intercept anonymously. An NSA contractor, Reality Leigh Winner, was arrested Saturday and charged with mishandling classified information. The speed with which the government identified her serves as a caution to anyone wanting to leak official US secrets.

The Intercept sent a scan of the document to another source during its reporting. That scan showed a crease in the original document, which implied that someone had printed the document and then carried it out of some secure location. The second source, according to the FBI’s affidavit against Winner, passed it on to the NSA. From there, NSA investigators were able to look at their records and determine that only six people had printed out the document. (The government may also have been able to track the printout through secret dots that identified the printer.) Winner was the only one of those six who had been in e-mail contact with the Intercept. It is unclear whether the e-mail evidence was from Winner’s NSA account or her personal account, but in either case, it’s incredibly sloppy tradecraft.

With President Trump’s election, the issue of Russian interference in last year’s campaign has become highly politicized. Reports like the one from the Office of the Director of National Intelligence in January have been criticized by partisan supporters of the White House. It’s interesting that this document was reported by the Intercept, which has been historically skeptical about claims of Russian interference. (I was quoted in their story, and they showed me a copy of the NSA document before it was published.) The leaker was even praised by WikiLeaks founder Julian Assange, who up until now has been traditionally critical of allegations of Russian election interference.

This demonstrates the power of source documents. It’s easy to discount a Justice Department official or a summary report. A detailed NSA document is much more convincing. Right now, there’s a federal suit to force the ODNI to release the entire January report, not just the unclassified summary. These efforts are vital.

This hack will certainly come up at the Senate hearing where former FBI director James B. Comey is scheduled to testify Thursday. Last year, there were several stories about voter databases being targeted by Russia. Last August, the FBI confirmed that the Russians successfully hacked voter databases in Illinois and Arizona. And a month later, an unnamed Department of Homeland Security official said that the Russians targeted voter databases in 20 states. Again, we don’t know of anything that came of these hacks, but expect Comey to be asked about them. Unfortunately, any details he does know are almost certainly classified, and won’t be revealed in open testimony.

But more important than any of this, we need to better secure our election systems going forward. We have significant vulnerabilities in our voting machines, our voter rolls and registration process, and the vote tabulation systems after the polls close. In January, DHS designated our voting systems as critical national infrastructure, but so far that has been entirely for show. In the United States, we don’t have a single integrated election. We have 50-plus individual elections, each with its own rules and its own regulatory authorities. Federal standards that mandate voter-verified paper ballots and post-election auditing would go a long way to secure our voting system. These attacks demonstrate that we need to secure the voter rolls, as well.

Democratic elections serve two purposes. The first is to elect the winner. But the second is to convince the loser. After the votes are all counted, everyone needs to trust that the election was fair and the results accurate. Attacks against our election system, even if they are ultimately ineffective, undermine that trust and ­– by extension ­– our democracy. Yes, fixing this will be expensive. Yes, it will require federal action in what’s historically been state-run systems. But as a country, we have no other option.

This essay previously appeared in the Washington Post.

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