this post was submitted on 01 Jul 2024
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[–] dgerard@awful.systems 9 points 4 months ago* (last edited 4 months ago) (2 children)

This is slightly weird. There's a company called "DNSfilter" that's been advertising itself for a few years as an "AI-powered DNS resolver" - since well before the present hype. I suspect their "AI" bit is threat detection with machine learning in. They appear to be going for the lucrative boring enterprise market.

This thread suspects the whole 0ms.dev thing was written with LLMs and the "mirrors" bit is basically an open proxy.

You sure they're skimming results? I saw what looks like a filter to add to an adblocker ...

[–] self@awful.systems 5 points 4 months ago

You sure they’re skimming results? I saw what looks like a filter to add to an adblocker …

see I don’t have a smoking gun on this, but if it is a garden variety adblocker and whatever the accelerator does (it’s extremely unclear) running on cloudflare workers, they at least have the ability to MiTM and modify DNS queries, and open proxies are always a security nightmare. my impression is the filter list they link is either what that endpoint uses to filter, or it’s LLM vomit they kept in because it felt more legitimate.

this might be worth poking at more in a controlled setting — a command line DNS-over-HTTP client using their endpoints and some exploration of the open proxy with curl (especially with sites that utilize credentials, with great care taken to use disposable accounts for this) might be illuminating

[–] froztbyte@awful.systems 5 points 4 months ago (2 children)

and the “mirrors” bit is basically an open proxy

could test this by setting up a simple example page and seeing the originating source for the traffic

same technique as previous, using an http (not https) canary:

geo_info: {'loc': '51.5085,-0.1257', 'org': 'AS13335 Cloudflare, Inc.', 'city': 'London', 'country': 'GB', 'region': 'England', 'ip': '141.101.98.196', 'timezone': 'Europe/London', 'postal': 'E1W', 'asn': {'route': '141.101.98.0/24', 'type': 'hosting', 'asn': 'AS13335', 'domain': 'cloudflare.com', 'name': 'Cloudflare, Inc.'}}
useragent: (no user-agent specified)
request_headers: {'Host': 'canarytokens.com', 'X-Real-Ip': '141.101.98.196', 'X-Forwarded-For': '2a06:98c0:3600::103, 141.101.98.196', 'X-Forwarded-Host': 'canarytokens.org', 'Connection': 'close', 'Accept-Encoding': 'gzip', 'Cf-Ray': '89f1a3a114752508-LHR', 'X-Forwarded-Proto': 'https', 'Cf-Visitor': '{"scheme":"https"}', 'Cf-Ew-Via': '15', 'Cdn-Loop': 'cloudflare; subreqs=1', 'Cf-Connecting-Ip': '2a06:98c0:3600::103'}
request_args: {}
[–] froztbyte@awful.systems 5 points 4 months ago

idle thought: since this is (as @self highlighted) effectively an open proxy, you could also just resource-bomb it quite easily

not that I'm planning to, but it'd be dirt bloody easy and it would be a very quick test as to the claims on the site

[–] froztbyte@awful.systems 4 points 4 months ago

while looking into this I was surprised to find that hickory doesn't seem to have a cli binary in its crates. did find crab-hole and adguardian in the process though, gonna have to play with those later