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
There are many fake sites and apps out there trying to take advantage of everyone's concern about the covid-19 threat. It's impossible to list all of them, but these are a couple examples. In general, seek news and information from known safe sources of information.
- A malicious website pretending to host a map of Coronavirus cases around the world (corona-virus-map [dot] com) actually contains the AZORult Trojan that will steal information, including sensitive data.
- A malicious android app that pretends to be a “Coronavirus Tracking App” which is ransomware that will infect the phone and lock it until payment is received. The malicious app is downloaded at (coronavirusapp [dot] site).
Because it works! Here's a real life story... https://isc.sans.edu/forums/diary/Why+Phishing+Remains+So+Popular/25742/
Security researchers have identified 24 Android apps delivering the recently-discovered Joker Trojan. As we've previously reported, Joker made its way onto Google Play as early as June, and it exfiltrates data while signing victims up for premium subscriptions.
The list of affected apps can be found here: https://hotforsecurity.bitdefender.com/blog/if-you-have-any-of-these-24-android-apps-installed-delete-them-now-21514.html
Hy-Vee Issues Warning to Customers After Discovering Point-of-Sale Breach
UPDATE: Hy-Vee now has a page that provides dates and locations that were affected by this breach. Visit https://www.hy-vee.com/paymentcardincident/ to check for dates and locations when your card information may have been stolen.
Though the firm cannot cite specific locations in which its point-of-sale (PoS) systems were affected due to an ongoing investigation, supermarket chain Hy-Vee notified its customers this week that a security breach occurred on certain systems. Thus far, it's believed that transactions at "Hy-Vee fuel pumps, drive-thru coffee shops, and restaurants (Market Grilles, Market Grille Expresses, and Wahlburgers)" may be vulnerable to hackers. A spokesperson said, "We believe the actions we have taken stopped the unauthorized activity on our payment processing systems."
Registers in Hy-Vee grocery stores utilize a different system and are reportedly not affected in the same way as those in the auxiliary enterprises. More information is available on the Hy-Vee site at https://www.hy-vee.com/corporate/news-events/announcements/notice-of-payment-card-data-incident/
Mobile devices, such as smartphones, smart watches, and tablets, continue to advance and innovate at an astonishing rate. As a result, some people replace their mobile devices as frequently as every year. Unfortunately, people often do not realize how much personal data is on these devices. See the latest OUCH! newsletter from SANS for assistance in this sometimes overlooked task.
Cyber criminals continue to come up with new and creative ways to fool people. A new type of scam is gaining popularity— personalized scams. Cyber criminals find or purchase information about millions of people, then use that information to personalize their attacks. Below we show you how these scams work and walk you through a common example. The more you know about these scams, the easier it is for you to spot and stop them.
Read the details in this month's OUCH! newsletter from SANS.
On Friday, February 1, major DNS (Domain Name System) software and public DNS providers will remove support for workarounds accommodating authoritative DNS servers that don’t follow published operational standards. UNI's DNS servers are compliant with the necessary standards, however, sites using authoritative servers that don’t meet standards may find their resources unreachable by large portions of the Internet. To be clear, the solution for an unreachable site lies with the unreachable site, not with UNI. Additional information is here.
January 28 is Data Privacy Day (DPD), an annual effort to promote data privacy awareness and education. This year's DPD events, sponsored by the National Cyber Security Alliance (NCSA), focus around the theme, A New Era in Privacy.
The NCSA Stay Safe Online website will feature a live stream of the Data Privacy Day 2019 - Live From LinkedIn event, which includes presentations on opportunities and challenges and the future of privacy, as well as a TED-style talk with the Amazon Web Services Global principal security architect.
The National Cybersecurity and Communications Integration Center (NCCIC), part of the Cybersecurity and Infrastructure Security Agency (CISA), encourages users and administrators to review NCSA's tips on Managing Your Privacy and the following NCCIC tips:
Caribou Coffee chain announces card breach impacting 239 stores, including the Cedar Falls store
"All customers who used a credit or debit card at one of the affected stores between August 28, 2018, and December 3, 2018, should consider their card details compromised and take precautions such as asking for a card replacement, reviewing credit card reports, and enrolling in identity protection programs. Users can consult the list of impacted stores via the company's data breach notice, posted on its homepage. Caribou Coffee officials said they detected that something was wrong last month, on November 28, when its IT staff was alerted of "unusual activity" on its network via its security monitoring processes."
To read the complete article see: https://www.zdnet.com/article/caribou-coffee-chain-announces-card-breach-impacting-239-stores/