this post was submitted on 08 Mar 2024
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But that also depends on the issuer that WebEx used. If this really was a MITM without someone fucking up and bypassing a warning, whoever the root CA is issuing for WebEx can no longer be trusted.
More likely they dialed in via mobile rather than use “Computer Audio” and that is easily defeated using a Stingray-type device.
Yes, in that case, it most likely was using an insecure channel to directly dial into the conference. Still, the entire certificate infrastructure is mere security theater, unless you're actually going through the trouble of checking every individual certificate yourself.
That’s the open secret of the Web, all security on it is just fake. The list of root certificates is way too long to provide any security.
Think it’s likely to impact people with regular threat models?
Any obvious solutions?
Public WiFi is the main problem, anybody connected to the same WiFi could potentially intercept all of your Web traffic. You could use a VPN to avoid that one.
Certificate transparency, pinning, etc