3 ms·

They removed OS spoofing just recently, and there isn't a mitigation for Raptor, some think meek might help with Raptor, but its very much up in the air.

qualeed 1y ago
There is partial mitigation for RAPTOR: Counter-RAPTOR from 2017 (https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7958620 https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=795...) with mostly the same authors. I haven't kept up with the space much since then, so am unaware if there is more recent work. In any case, there are valid threat models where you want to mitigate website fingerprinting but aren't necessarily concerned with AS-level adversaries.
- trod1234 1y ago
  I've seen that, but I didn't see much of a mitigation, though I'll go back and recheck just to be sure, I was pressed for time last time I look at that. In fairness, most of big tech are AS-level adversaries at this point. Active attack through BGP-hijacking may be partially mitigated, but this isn't really needed for the most pernicious attacks which are interception/injection from a regional entity that's routing to the broader internet (outbound connections). The same entities can do early transparent encryption termination for outbound connections (to the general web) since they have their own private signing keys tied to root trust CAs (just not the one the valid cert was issued to), and that lets them collect a treasure trove of forensic artifacts to improve their citizen dossier for advertisers/highest-bidder, or inject content that is ephemeral in nature.
- wfn 1y ago
  > There is partial mitigation for RAPTOR: Counter-RAPTOR from 2017 (https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7958620 https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=795...) Oh I had missed that, thank you btw! Need more of those BGP monitoring systems... (and they performed an actual live BGP attack (not just simulation), neat)
immibis 1y ago
Note this means instead of always sending a Windows user-agent, they send either Windows, Mac, or Linux: one of three user-agents. They don't send more than that, e.g. they don't reveal your Windows version.
- ranger_danger 1y ago
  It was always trivial to find the real OS behind a tor browser user because navigator.platform has never been spoofed by TBB, even when the user-agent was.

qualeed 1y ago

There is partial mitigation for RAPTOR: Counter-RAPTOR from 2017 (https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7958620 https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=795...) with mostly the same authors. I haven't kept up with the space much since then, so am unaware if there is more recent work. In any case, there are valid threat models where you want to mitigate website fingerprinting but aren't necessarily concerned with AS-level adversaries.

trod1234 1y ago
I've seen that, but I didn't see much of a mitigation, though I'll go back and recheck just to be sure, I was pressed for time last time I look at that. In fairness, most of big tech are AS-level adversaries at this point. Active attack through BGP-hijacking may be partially mitigated, but this isn't really needed for the most pernicious attacks which are interception/injection from a regional entity that's routing to the broader internet (outbound connections). The same entities can do early transparent encryption termination for outbound connections (to the general web) since they have their own private signing keys tied to root trust CAs (just not the one the valid cert was issued to), and that lets them collect a treasure trove of forensic artifacts to improve their citizen dossier for advertisers/highest-bidder, or inject content that is ephemeral in nature.
wfn 1y ago
> There is partial mitigation for RAPTOR: Counter-RAPTOR from 2017 (https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7958620 https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=795...) Oh I had missed that, thank you btw! Need more of those BGP monitoring systems... (and they performed an actual live BGP attack (not just simulation), neat)

immibis 1y ago

Note this means instead of always sending a Windows user-agent, they send either Windows, Mac, or Linux: one of three user-agents. They don't send more than that, e.g. they don't reveal your Windows version.

ranger_danger 1y ago
It was always trivial to find the real OS behind a tor browser user because navigator.platform has never been spoofed by TBB, even when the user-agent was.