Spectrum ISP SSL/TLS Interception Bug(andrewgazelka.notion.site)
andrewgazelka.notion.site
Spectrum ISP SSL/TLS Interception Bug
https://andrewgazelka.notion.site/SSL-Issue-2c46ce90d17f80a9bc30ff3402f7f865
8 comments
Is it naive of me to ask why it is being just casually accepted that a major ISP is mitm'ing TLS traffic?
They are also probably collecting DNS records from millions of customers too or inspecting SNI on TLS handshakes to know what sites each customer is visiting.
ECH and DOH people!
ECH and DOH people!
None of that requires messing with the connection though. You can't draw just passively observe and get the same info.
They most certainly are. Large ISPs use Nokia Deepfield or Kentik for network monitoring, observability and user metrics. Both work due to volumes of metadata from net flows and DNS.
My gut tells me the broken intercept is a Nokia product.
My gut tells me the broken intercept is a Nokia product.
This is correct, it's even open source: https://github.com/deepfield/dnsflow.
> "Encrypted Client Hello (ECH) - Enabled, limited effect"
Not sure what TFA means with this, reads like ECH doesn't help
Coincidentally, this article's webpage breaks copy & paste in its tables for presumed reasons of being "cutesy" with table click behavior. Can people please stop doing idiotic shit like this?
Not sure what TFA means with this, reads like ECH doesn't help
Coincidentally, this article's webpage breaks copy & paste in its tables for presumed reasons of being "cutesy" with table click behavior. Can people please stop doing idiotic shit like this?
OT: Letter-spacing horrible. Backslash: SSL\TLS.
During one particularly annoying episode where it effectively became a DOS I had my router log all dropped packets and then rebooted it. Immediately after reconnecting it drops a few incoming martians and invalid packets as if they were still expecting an active connection where there shouldn't have been any. The IPs were mostly upstream endpoints or gateways but at least once it was from a residential IP instead.
Between the weird arbitrary nature of the SSL/TLS handshake issues and the possible spoofing from upstream gateways I get the impression this is much more than just a bug.