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One Hat Cyber Team
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216.73.216.112
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65.21.180.239
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Linux gowhm.eplangoweb.com 5.4.0-216-generic #236-Ubuntu SMP Fri Apr 11 19:53:21 UTC 2025 x86_64
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Apache
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8.0.30
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cpanel-p0f
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existential-notes.txt
----------------------------- Some random food for thought: ----------------------------- 1) If you run p0f on any reasonably popular server, you will probably see quite a few systems that seem to be leaking memory in TCP headers (e.g. ACK number or second timestamp set on SYN packets, URG pointer without URG flag, etc). You will also see HTTP traffic with non-stripped Proxy-Authorization headers and other hilarious abnormalities. Unfortunately, pinpointing the sources of many of these leaks is pretty hard; they often trace to proprietary corporate proxies and firewalls, and unless it's *your* proxy or firewall, you won't be finding out more. If you wish to put some investigative effort into this, there are quite a few bugs waiting to be tracked down, though :-) 2) After some hesitation, I decided *against* the inclusion of encrypted traffic classification features into p0f. Timing, packet size, and direction information lets you, for example, reliably differentiate between interactive SSH sessions and SFTP uploads or downloads; automated and human password entry attemps; or failed and successful auth. The same goes for SSL: you can tell normal HTTPS browsing from file uploads, from attempts to smuggle, say, PPP over SSL. In the end, however, it seems like stretch to cram it into p0f; one day, I might improve my ancient 'fl0p' tool, instead: http://lcamtuf.coredump.cx/soft/fl0p-devel.tgz