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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Jack Rhysider‏ @JackRhysider May 23
      • Report Tweet
      • Report NetzDG Violation

      I learned a lot tonight. This is what dev tools tells me in Edge by just visiting eBay. The website is port scanning my laptop, bypassing my firewall, and doing it in/from the browser. It checked 14 ports. Let's discuss. 1/5pic.twitter.com/0w4uSKiWR5

      124 replies 1,167 retweets 2,714 likes
      Show this thread
      Will Dormann‏ @wdormann May 24
      • Report Tweet
      • Report NetzDG Violation
      Replying to @JackRhysider @thegrugq

      These are the ports used by RDP, VNC, TeamViewer remote desktop, X11, etc. One one hand, should we be concerned / surprised that browsers allow this kind of automatic scanning? On the other hand, why is eBay Checking if visitors' machines allow for remote access from their LAN?

      5:31 AM - 24 May 2020
      • 44 Likes
      • General_Zod Samuel Stark Fredrik Norlin Benjamin Carr, Ph.D. 👨🏻‍💻🧬🌊🐕📷 Cyb3rtooth Steve Drzaszcz Loïc Kr0ff Karim annymosse
      7 replies 0 retweets 44 likes
        1. New conversation
        2. SickSec‏ @OriginalSicksec May 25
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          Replying to @wdormann @JackRhysider @thegrugq

          I had a lot of interactions with eBay team via chat and I think they do this to verify is really the seller are using their local PC instead of an RDP to create multiple accounts

          1 reply 0 retweets 1 like
        3. Will Dormann‏ @wdormann May 25
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          Replying to @OriginalSicksec @JackRhysider @thegrugq

          Wait, so checking for a listening RDP (or other) port is how one can determine if the person using eBay doesn't have multiple accounts? That doesn't seem sound. But then again, eBay allowed sellers to post arbitrary Javascript/ActiveX/Flash until *checks notes* almost 3 years agopic.twitter.com/Kk3hsUeGPw

          1 reply 0 retweets 1 like
        4. 1 more reply
        1. New conversation
        2. thaddeus e. grugq‏ @thegrugq May 24
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          Replying to @wdormann @JackRhysider

          Since when is it a crime to be curious?!?

          9 replies 3 retweets 44 likes
        3. ⓉⒸ‏ @TC_Johnson May 24
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          Replying to @thegrugq @wdormann @JackRhysider

          When it’s curiosity about you that’s being satisfied and not your curiosity about others.

          0 replies 0 retweets 11 likes
        4. End of conversation
        1. Flagpole to Canada‏ @Flagpole_Canada May 24
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          Replying to @wdormann @JackRhysider @thegrugq

          If your ebay credentials are stolen, and those credentials are used on your own computer, remotely, eBay won’t know that it’s a high-risk login or high-risk transaction.

          0 replies 0 retweets 0 likes
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        1. Adam Prime‏ @adamprime May 24
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          Replying to @wdormann @JackRhysider @thegrugq

          This looks like bot and/or fraud detection stuff more than ads to me. Attempting to “protect the platform”, or something like that. But who knows what myriad of ways the data can potentially be leveraged.

          0 replies 0 retweets 0 likes
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        1. New conversation
        2. Jonathan Holmes  🐔‏ @crait May 24
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          Replying to @wdormann @JackRhysider @thegrugq

          Scammers have used eBay to launder money from victims to the scammers, themselves, after connecting to the victims' computers using screensharing services, such as TeamViewer, AnyDesk, etc. I've seen it with @Kitboga's scambait livestream.

          1 reply 0 retweets 0 likes
        3. Jonathan Holmes  🐔‏ @crait May 24
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          Replying to @crait @wdormann and

          Perhaps this is some kind of anti-fraud detection or analytics gathering for something benificial? (Giving eBay the benefit of the doubt, of course.)

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. Đan Lisi‏ @discodingo0 May 24
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          Replying to @wdormann @JackRhysider @thegrugq

          Some could pay people in other countries to use their machine via remote desktop in order to avoid geo-restrictions or let your account/shop appear to be based in a different country. Commercial VPN IPs are easy to detect and block

          0 replies 0 retweets 1 like
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