Fun with a JetDirect

Fun with a JetDirect

Well, I’ve been playing with JetDirect enabled printers and other a few Savins so I can make a video for the next Infonomicon TV. Here is what I have so far for what I want to show, starting from the simple to the arcane:

1. Intro to the concept.
2. Diagnostics page.
3. Finding Network printers using Nmap.
4. What an Nmap scan looks like (garbage print jobs)
5. Using an JetDirect box for an Nmap Zombie scan bounce.
6. Setting up a direct IP printer in Windows (I may skip this).
7. Controlling the JetDirect box with telnet/a web browser.
8. Jetadmin.
9. DoSing the printer.
10. Changing the LCD display text using HPhack, IGhphack and Hijetter.
11. Changing settings with Hijetter.
12. Using Hijetter to treat some JetDirect boxes as files/web servers.
13. Finding stored faxes and print jobs on the Jetdirect printers.


Other ideas? Many folks don't realize some of the stuff you can find out/do with a network printer, otherwise they would secure them more.

Just for sh*ts and giggles.. ping the (subnet) broadcast address and see how many printers respond ;) Probably don't have to tell you it's easy to spoof icmp :D

So I assume a network-printer is not secure within a network? Hmmm. Maybe Symantec will one day make a virusscanner for printers. :)

(Help, my printer is infected with AdWare!)

Would be interesting if you could add some additional text to be printed with every print command on every page. Or have every document sent to some location outside the company, as some kind of industrial espionage.

Well, I just recently found out how easy it is to sniff print jobs and collect them for later viewing with Ethereal.

Hey Iron, when is the next infonomicon due out? If you ever get bored, I bet a video tut on etheral alone would be very useful!

This perl script is fun..
http://www.phfactor.net/code/hpset/

Quote:

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Requirements

1. A networked HP printer, HP4M+ or later, with JetDirect card. Tested on 4M+, 8150DN, and 8500 so far. The later machines appear to lack lower case characters, for some reason, and all of them have varying lengths of strings they can display.
2. A host able to connect to said printer and run Perl.

Usage

hpset -m my.printer.com 'Chode Rules'
hpset -m hp.marketing.example.com 'YOU ARE WEASELS'

Actually, the quotes are optional:

hpset -m hp2.example.edu Lunch wasn't Really Chicken

There's also a -p argument to set the port, but as far as I know they all use port 9100. To reset the message, either reset the printer or run hpset with the default message, usually 'READY'.

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HPhack, IGhphack and Hijetter can do much the same thing.

http://www.irongeek.com/i.php?page=security/hphack

hmmm

I\m tempted to try this at work...

Quote:

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Originally posted here by Irongeek
Well, I just recently found out how easy it is to sniff print jobs and collect them for later viewing with Ethereal.

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Yep, the same goes for the insecure pop3 mail passwords... ethereal...

Sniffing the printer traffic means you have to be in the path somewhere. The 'normal' sniffing rules apply. What I found really, really troublesome is the fact that a lot of the modern printers (usually the ones with fax and scanning capabilities) store documents. Anyone with a browser can just connect to that printer and browse scanned/printed documents.

The TCP/IP stack on these printers is usually seriously flawed too. No way to configure certain aspects.. Like turning ICMP broadcast pings on/off.

That's one of the reasons I usually put all printers on a seperate network, firewall them and only allow the printserver access.