codeblog code is freedom — patching my itch

8/7/2005

oscon 2005 wireless sniffing

Filed under: Networking,Security — kees @ 9:03 pm

OSCON’s wireless network was okay. It didn’t seem to handle the load very well, but generally you could pick out an Access Point that was still responding to DHCP, and it would work well enough.

I feel like I’m beating a dead horse, but I’m appalled at how many people continue to not use encryption. I spent some time yesterday going through my 4.1G of packet capture logs. Generally, I scanned POP, SMTP, IRC, and HTTP traffic. I should probably find better tools than just ethereal, but after finding 45 different POP accounts that were authenticating in the clear, I stopped counting. That put me half way through Thursday, so that’s only a day and a half of OSCON wireless traffic. No one seems to protect their nick on FreeNode, so at least no one’s nick password was sent in the clear. One person logged into Flickr in the clear. One of the accounts was for the speaker I was listening to at one point. I recognized the POP account because it was up on his slides.

What’s really interesting is the number of people that didn’t authenticate in the clear but ran the rest of their traffic in the clear. For example, many people used various challenge/response systems to authenticate to POP, IMAP, SMTP, and AIM, but then all the traffic continued to stay in the clear. All their email and AIM buddy information was out on the wire.

I know there was at least one other person doing network sniffing, since I saw him running EtherPEG (which makes a live collage of all the incoming HTTP images on the wire). I started up a heavy download of images just for him, but I think he had bored himself with enless slashdot and oreilly GIFs and never looked back to see the fun I had sent over the air for him. :)

(If you don’t have a Mac and you want EtherPEG functionality, there is also DriftNet.)

© 2005, Kees Cook. This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 License.
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2 Comments »

  1. Kees, what is the best way to protect my net communications from packet sniffing? Also, what is the best way to secure IM? I don’t want to get sniffed too much :)

    Comment by Jon Phillips — 8/7/2005 @ 10:04 pm

  2. Hopefully the next blog post will be useful. Also, looks like at least one other person at OSCON has read my post. All I wanted to do was get people thinking. :)

    Comment by kees — 8/10/2005 @ 5:22 pm

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