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A Bridge Too Far
Defeating Wired 802.1X with a 
Transparent Bridge Using Linux
Alva Lease ‘Skip’ DuckwallIV
Exorcystat gmaild0t com
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Who Is This Guy?
• Been working with Linux since before the 1.0 
kernel (1993ish)
• Unix admin by trade –transitioned to IT security
• Likes alphabet soup:
–GCUX, GSEC, GCFA, RHCE, SCSA (missing 12 letters)
–Sitting for the GSE written in the middle of August
• Works for Northrop Grumman on a team that 
performs full scope penetration tests ☺
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The Objective
To introduce a device on a wired 802.1X secured 
network with the following properties:
1. Transparent (undetectable) to the network 
2. Remote communication and interaction
3. The ability to inject traffic on to the network
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What We Need
• Linux Box with 2 network ports
• Extra Ethernet Cable
• A Workstation authenticating to the local 
network using wired 802.1X of some sort 
• Another box that we use to handle the 
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A laptop/Netbook with an additional 
USB network device running Linux
–Obviously Difficult to Hide
–Powerful x86 CPU/memory/HD
–Best used for in person demos ☺
Small x86 Computer (industrial/mini pc)
–Atom CPU (x86) with 1-2gb memory
–Storage via laptop HD or flash
–Fanless in many cases
–Built in Dual Gig Ethernet in some
–4”x4.5”x1” approximately
Plug Computer
• Embedded Marvell CPU (ARM) running Linux
• 512mb ram/512mb internal flash
• Can use SD cards for storage / Boot
• Fanless
• Built in Ethernet/USB port
• Looks like a weird “wall wart”
Choice of Linux Distro
• Backtrack 4r2 for x86 CPUs
–Quiet by default (no services start by default, no 
network by default, etc)
–Well tested and used
–Lots of built-in toys
–Yes, I know 5 is out.  Already had it working with 4.
• Ubuntu 9.04 for my plug computer
–Newer versions of the hardware might not support it
–Moving forward will probably switch to Debianor roll 
my own distribution
Quick Review: Ethernet Frame
For TCP/IP (without using 802.1q VLANS) this is 
what an Ethernet frame looks like
–Destination/Source Addresses are MAC addresses
–Either an Ethernet frame or Address Resolution 
Length / 
8 bytes
6 bytes
6 bytes
2 bytes
variable 46-
1500 bytes
4 bytes
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