I wrote about ransomware about a year ago. The only things that have changed since then are that the result of becoming infected have gotten far more severe and the number of victims has increased exponentially. Today's variants not only encrypt your data and demand payment to decrypt it, they also steal your data and threaten to expose it to the world if payment is not made. Under that scheme, even if you have proper and sufficient backups to restore your data, making the encryption moot, there is the threat that your data will be published for all to see.
We are not immune from these attacks here in the midwest. Last fall, the University of Nebraska Medical Center and Nebraska Medicine were breached. Associated costs are many tens of millions of dollars. More recently, and even closer to home, DMACC suffered a ransomware attack early last month that shut their network and classes down for almost two weeks.
Phishing provided the initial foothold for the bad actors behind these and many other similar incidents. Vigilance and skepticism when reading email remains key. Don't fall for the emotions that all phishing actors try to evoke -
- Fear - something bad will happen if you don't click on the link in the message
- Greed - something good will happen if you do click on the link in the message
- Urgency - hurry up and click on the link in the message right now
- Concern/Empathy -
- I’m stranded in an unfamiliar city
- I’m falsely accused, in jail, and need bail money
- I’ve been mugged and am in the hospital
Don't click on links in email messages unless you're certain they are legitimate. Don't open attachments in email messages unless you're certain of the sender's identity and the content of the message makes sense to you. If you have any questions about the message, err on the side of safety and seek help by contacting email@example.com.
On June 18th Information Technology will replace the security certificate used to secure connections to Eduroam WiFi on campus. All UNI-owned and managed devices will be automatically reconfigured for the new connection and nothing will be required. However, personally owned laptops, tablets, and smart phones will potentially be asked to accept a new security certificate the first time they connect to Eduroam WiFi on June 17th. These prompts could look something like the screen captures below.
If you have questions or trouble connecting to Eduroaom WiFi on campus, please visit this IT support article. You can also contact your IT support by submitting a "Get IT Help" request from the Service Hub Portal.
Mobile devices, such as tablets, smartphones, and smartwatches, have become one of the primary technologies we use in both our personal and professional lives. What makes these devices so powerful are the thousands of apps we can choose from. These apps enable us to be more productive, communicate and share with others, train and educate, or just have more fun. Here are steps you can take to securely use and make the most of today’s mobile apps. Read them at https://www.sans.org/newsletters/ouch/securely-using-mobile-apps/
Have I Been Hacked? No matter how secure you are, sooner or later you may have an accident and become "hacked". Below are clues you might have been hacked and if so, what to do. See https://www.sans.org/security-awareness-training/resources/what-do-when-hacked for more information.
Trying to securely make the most of today’s technology can be overwhelming for almost all of us, but it can be especially challenging for family members not as used to or as familiar with technology. Therefore, we wanted to share some key steps to help secure family members who may be struggling with technology and might misunderstand the risks that come with using it. Read more at https://www.sans.org/security-awareness-training/resources/securing-generation-gap
While online holiday shopping is nothing new, more of us will be avoiding the malls and brick-and-mortar stores this year — which opens up big opportunities for cybercriminals. This, along with COVID-19, is expected to anchor most of the scam and phishing lures in circulation this season. Read more at https://threatpost.com/online-holiday-shopping-phishing/161412/
A common misconception about cyber attackers is that they use only highly advanced tools and techniques to hack into peoples’ computers or accounts. Cyber attackers have learned that the easiest ways to steal your information, hack your accounts, or infect your systems is by simply tricking you into doing it for them using a technique called social engineering. Read more on this month's OUCH! newsletter from SANS, https://www.sans.org/security-awareness-training/resources/social-engineering-attacks
Some UNI account passphrases expired over the summer of 2020 and were extended temporarily to reduce the challenges related to remote work and learning. These temporarily extended accounts will expire on Wednesday, September 23, 2020 and begin receiving email notifications about their passphrase expiring starting on Tuesday, September 8th, 2020.
If you have received an expiration email for your CatID or a departmental account, you can change the passphrase yourself by visiting myUNIverse, and choosing the impacted account under “Passphrase Central”.
Note: The expiration date listed in “Passphrase Central” will be incorrect, but these accounts will expire on or before September 23.
How do you tell which account needs to change the passphrase? Look at the username listed in the email notification to determine which account has expired.
If you need assistance changing your passphrase, you can reach out for help through servicehub.uni.edu or by calling the IT Service Desk at 319-273-5555.
You can sign up for the CatID Account Recovery Setup under Passphrase Central and reset your CatID account at any time.
Ransomware is a type of malicious software (malware) that is designed to hold your files or computer hostage, demanding payment for you to regain access. Ransomware has become very common because it is so profitable for criminals. More details are available in the OUCH! newsletter on the SANS website, https://www.sans.org/security-awareness-training/resources/ransomware
Zoom has been getting a lot of attention from the media and the criminal elements of the Internet due to its sudden, massive surge in popularity–10 million users to 200+ million users. There is not a popular application or operating system out there that has not had its share of major incidents. For example, Microsoft releases security patches at least once every month. Most of the time Microsoft is fixing vulnerabilities that can be used to hijack a computer system. Google regularly issues patches for Google Chrome that fix vulnerabilities that could allow a malicious website to execute code on the computer. Sometimes we get multiple patches a week from Google. Likewise, the same happens to Mozilla Firefox.
Hopefully I am not scaring you away from your computer, but I want to make sure our look at Zoom is taken in context. Where were the news articles about Windows, Chrome, and Firefox? They have a much larger user base than Zoom. Yet these security issues have become so routine, they often only get noticed by IT people like myself that are actively watching for security alerts.
Further, many of the articles we are seeing are from Zoom users doing unwise things that are completely out of the control of Zoom. A recent article I saw was about Zoom users uploading recordings of their Zoom meeting online for everyone on the Internet to see. There is nothing Zoom can do to stop people from uploading files to the Internet so that anyone can see them–these same people probably upload all sorts of files with improper permissions. Another article covered a user that disabled passwords on their Zoom meetings to make it easier for their participants to join–it also makes it easy for the bad guys to join. Most of the Zoombombing incidents have been caused by the host or participants accidentally (or in some cases intentionally) sharing the meeting ID and password publicly for anyone to find. Sometimes this happens because they have set their calendars to be publicly accessible. A lot of this reporting is sensationalism just to get clicks and advertising revenue in a time when web news sites are actually under enormous financial pressure. Most advertisers have been cutting back altogether or rejecting advertising on articles that mention keywords related to the pandemic. This has driven the pay per click/view in advertising way, way down.
However, there is also legitimate criticism of Zoom that has been reported.
- Zoom claimed they used AES 256 encryption but in some instances AES 128 would be used. AES 256 is used for Top Secret communications by the government, UNI and most of the Internet actually uses AES 128 for most encryption needs. If Zoom had said they used AES 128 or just simply said AES, it would have been fine. Shortly after discovery, Zoom migrated fully to AES 256.
- Zoom claimed to use end-to-end encryption. The traditional tech meaning of end-to-end has been that communications are encrypted by one user and are not decrypted until they get to the other user, so no points in the middle could see unencrypted data. That technique actually does not work well in a large video meeting where the same information needs to be broadcast to multiple users. So they actually encrypt from the client to the server, decrypt there, then encrypt again when the data is sent back to the other clients in the meeting. The actual video and audio data is encrypted with a shared encryption key used by all users on the same call. This admittedly is a poor implementation of encryption, but it is an efficient way to communicate while still enabling some privacy. WebEx, a competitor to Zoom, does have true end-to-end encryption as an option, but when it is used many features of the software get disabled–so most meetings in WebEx are not end-to-end encrypted either. When pointed out to Zoom, they admitted they were not using the same definition for end-to-end encryption as most tech companies now use. Zoom has announced plans to improve the quality of encryption used in Zoom.
- Zoom used an off-the-shelf software development kit (SDK) for mobile apps designed by Facebook to allow Zoom users to use Facebook as their authentication credentials. When the SDK was used, it also sent limited analytics data about the mobile device back to Facebook. Such analytics sharing is very, very common in mobile apps and all over the Internet, but it must be disclosed if you dig into the privacy policies and documentation. When discovered, Zoom removed the SDK and integrated Facebook authentication in a different manner.
- Zoom used a workaround on the Mac versions to allow the software to install and run without requiring the user to approve access to the webcam and microphone as Mac OS normally requires now. This was done to make the software easier to use, but legitimate software using such a technique is a major faux pas and opened up the system to other apps being able to gain the same access. This "feature" was removed back in July of 2019.
- Zoom had an issue where malicious links sent via chat could cause a user’s computer username and password to be sent to a remote server if the link was clicked. This is as much a flaw in Windows as it is in Zoom. All Zoom did in that instance was pass a server link sent via its chat feature to Windows for processing and Windows decided in its wisdom to send the username and password for the computer to the remote server listed in the link–but this would only happen if the user clicked the link. This issue has since been patched by Zoom.
Now, all of the above criticisms of Zoom are valid. However, I have seen plenty of other software programs and websites make the exact same or similar mistakes. Here are a couple examples, but this list could be endless.
- Microsoft added intensive analytics and data gathering to Windows 10 and then back-ported the analytics to their older versions of Windows in an automatic update without adequate disclosure to the users.
Again, I am not saying that Zoom did no wrong, just that it is entirely typical in how the modern tech community regularly sidelines the privacy and security of users in the name of innovation. We are aware of what Zoom really is doing and view it as no more risky than any other communications and educational platform we regularly use.
As for what you should do to protect yourself when using Zoom, the same advice for Zoom also applies to email, web links, etc. Do not click on links unless you absolutely trust the person that sent it. Likewise, only accept file transfers within Zoom from users you absolutely trust. Whenever possible, do not disable the security features UNI has set as defaults for Zoom. If problems with participants are anticipated, contact the IT Service Desk for advice on configuring Zoom to minimize possible disruptions. Like any other application, Zoom should be updated when security updates come out. Zoom has been quick to patch as issues have been identified.
Likewise, you should keep your operating system, browsers, and other software up-to-date. Many attacks actually use multiple vulnerabilities strung together. Further, you should be vigilant when using the computer. Watch out for things that just do not make sense. Many attacks still require user participation in some fashion–approving an application to run, manually starting an application that was downloaded, allowing a program administrative rights, downloading a suspicious attachment, etc. Be skeptical of anything that seems out of the ordinary. Certainly never trust pop-ups and websites that claim your computer is "infected" or that direct you to call a number to have your computer fixed. Please watch out for phishing attacks, see our website at https://it.uni.edu/phishing for more details about them.
The last thing I will point out is to keep a perspective on other technologies we use all the time and compare their security to that of Zoom. For example, most people do not hesitate to use email, but depending on who you send your email to or how it is routed over the Internet, it is completely possible for it to travel entirely unencrypted over the public Internet. Even if it is encrypted, each mail server along the path will have access to the decrypted contents. Yet we use email all the time for private conversations, online password resets, etc. Social network sites are gathering all types of data from all over the Internet. Google is gathering data from most websites, from its search, from email, and even partnering with credit card companies to link purchases to people to deliver targeted advertising. Many phone conversations, but not all, are routed over the public Internet with minimal security. Yet most of us use these technologies all the time. As such, we should all be more aware of the risks our data and information are subject to all the time, and be vigilant about protecting information we would prefer to be kept private.
I do not have any concerns using Zoom and see it as a perfectly acceptable technology to use in higher education, but I am aware of its limitations. There is always a trade-off between usability and security that must be balanced. In fact, for home users Zoom recently changed that balance towards more secure defaults to protect their novice users. Like any technology, some responsibility lies on the users to properly use the software. That said, I certainly would never use Zoom as the British government did for a cabinet meeting–there the security implications are significant enough to warrant end-to-end encryption with unique login credentials for each user. But admittedly, that would have been much more difficult to set up on short notice.
Let IT-Information Security know if you have any further questions or concerns. We will be happy to address them. We can be reached at firstname.lastname@example.org. Also, I will fully admit there is room for debate about when a tech company actually "crosses-the-line." Many of us would draw the line in different spots, so there is room for healthy debate in my assessment.
Eric Lukens, IT-Information Security