Source: Matt Brown | Windows Central
What you need to know
- A vulnerability in Zoom allows hackers to obtain your Windows login name and password.
- The vulnerability relies on people clicking a link that is actually a Windows networking UNC path.
- If a person clicks the link, Zoom can send the person's login name and NTLM password hash, which can be used to obtain a person's password.
Zoom is having a moment right now. It's become the go-to form of communication for many people during the current health crisis. Unfortunately, a vulnerability within Zoom can allow hackers to obtain people's Windows login name and password. Security researcher and Twitter user Mitch (@_g0dmode) spotted the vulnerability first. BleepingComputer then followed up with its own investigation and testing.
The core of the issue revolves around how Zoom handles URLs. When you send a URL within a Zoom chat, the program converts it into a link. That's handy for websites, but the problem is that Zoom also converts Windows networking UNC paths into links. If someone clicks a link that's a UNC path, Windows will try to connect to the remote site the path goes to using SMB file-sharing protocol. By default, this action will cause Windows to send a person's login name and their NTM password hash. The NTLM password hash can be cracked using free tools, such as Hashcat, and reveal someone's password.
Security researcher Matthew Hickey (@HackerFantastic) tested this process and was able to get NTLM password hashes using the vulnerability. BleepingComputer replicated the process as well. BleepingComputer was able to dehash an "easy password" in just 16 seconds.
In addition to helping hackers obtain people's passwords, the same process can also be used to launch programs on people's computers. Fortunately, Windows will prompt you when this happens and ask if you want to run the program.
How to fix Zoom's Windows 10 user-info and password-leak problems
Hickey spoke to BleepingComputer about how to fix the issue, stating, "Zoom should not render UNC paths as hyperlinks is the fix, I have notified Zoom as I disclosed it on Twitter."
Until Zoom issues a fix, you can prevent NTML credentials from being automatically sent to a remote server when you click a UNC link. This is done with a Group Policy. Bleeping Computer outlines the process and we also have our own guide on how to do it.
Review: Sable is an endearing journey in a fresh open world
Sable is a memorable game about understanding who you are. Technical hitches make it a rough journey, but a journey worth taking all the same. Here's our review.
New video breaks down all the small changes for the bigger Surface Pro 8
If you think Surface Pro 8 only got a bigger display and faster processor, you'd be very wrong. The latest Microsoft Mechanics video breaks down all the changes like an ambient color sensor, large pixels for the camera, or how the new thermal system lets Surface Pro 8 hit a new high of 23-watt TDP.
Surface and Windows 11: Experts weigh in on Microsoft's ecosystem prospects
Microsoft's Surface devices and the world of Windows seem to be getting snugglier and snugglier. But what's the endgame there?
The NFL is back! Check out these must-have Windows apps for football fans
After months of waiting through the offseason, the NFL is finally back this week. With these Windows 10 apps, you won't miss a snap of the NFL action.