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As depicted above, zWarDial found roughly 2,400 exposed meetings in less than 24 hours. The distribution of Zoom meetings found by zWarDial, indexed by industry.
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These include at least one tech company that’s taken to social media warning people about the need to password protect Zoom meetings! KrebsOnSecurity is not naming the companies involved, but was able to verify dozens of them by matching the name of the meeting organizer with corporate profiles on LinkedIn.īy far the largest group of companies exposing their Zoom meetings are in the technology sector, and include a number of security and cloud technology vendors.
The results were staggering, and revealed details about Zoom meetings scheduled by some of the world’s largest companies, including major banks, international consulting firms, ride-hailing services, government contractors, and investment ratings firms. That information included the link needed to join each meeting the date and time of the meeting the name of the meeting organizer and any information supplied by the meeting organizer about the topic of the meeting. Lo shared the output of one day’s worth of zWarDial scanning, which revealed information about nearly 2,400 upcoming or recurring Zoom meetings. “Having a password enabled on the meeting is the only thing that defeats it,” he said. Only meetings that are protected by a password are undetectable by zWarDial, Lo said. Each instance, he said, has a success rate of approximately 14 percent, meaning for each random meeting number it tries, the program has a 14 percent chance of finding an open meeting. Lo said a single instance of zWarDial can find approximately 100 meetings per hour, but that multiple instances of the tool running in parallel could probably discover most of the open Zoom meetings on any given day. “This gives me the room information without having to log in.” “Zoom recently said they fixed this but I’m using a totally different URL and passing a cookie along with that URL,” Lo said, describing part of how the tool works on the back end.
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Lo said zWarDial evades Zoom’s attempts to block automated meeting scans by routing the searches through multiple proxies in Tor, a free and open-source software that lets users browse the Web anonymously. Lo and fellow SecKC members recently created zWarDial, which borrows part of its name from the old phone-based war dialing programs that called random or sequential numbers in a given telephone number prefix to search for computer modems.
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New data and acknowledgments by Zoom itself suggest the latter may be more likely.Įarlier this week, KrebsOnSecurity heard from Trent Lo, a security professional and co-founder of SecKC, Kansas City’s longest-running monthly security meetup.
This suggests that many Zoom users have disabled passwords by default and/or that Zoom’s new security feature simply isn’t working as intended for all users.
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Nevertheless, the incidence of Zoombombing has skyrocketed over the past few weeks, even prompting an alert by the FBI on how to secure meetings against eavesdroppers and mischief-makers. Zoom also said it would block repeated attempts to scan for meeting IDs, and that it would no longer automatically indicate if a meeting ID was valid or invalid. Zoom responded by saying it was enabling passwords by default in all future scheduled meetings. The Check Point researchers said enabling passwords on each meeting was the only thing that prevented them from randomly finding a meeting. Security experts at Check Point Research did exactly that last summer, and found they were able to predict approximately four percent of randomly generated Meeting IDs. Naturally, hackers have figured out they can simply guess or automate the guessing of random IDs within that space of digits. According to its makers, zWarDial can find on average 110 meetings per hour, and has a success rate of around 14 percent.Įach Zoom conference call is assigned a Meeting ID that consists of 9 to 11 digits. ZWarDial, an automated tool for finding non-password protected Zoom meetings.
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