Linksys WRT54G runs Linux

Configuration and operational information about stumbled AP's

Linksys WRT54G runs Linux

Postby Thorn » Mon Jul 07, 2003 10:28 am

The Linksys WRT54G runs Linux, and all the firmware has been GPL'd and now available for download.

Check out:

I see two things possibly happening in the immediate future:
1) Good: New tweaks/add-on functions, etc. for this model AP/Router.
2) Bad: New attacks on this AP/Router based on uploading modified firmware code into APs with default settings. I hope this comes with some sort of default WEP or WPA.
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Postby peekitty » Mon Jul 07, 2003 11:13 am

You can flash the firmware from the wireless side?:eek: I'd stay away from such a device on principal, give me that old-time USB port...

For what it's worth, SMC and Dell have produced Linux-based APs and there's no history of these devices being compromised.
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Postby sint@x » Thu Jul 10, 2003 3:29 pm

Actually I bought one a week ago. I wouldn't recommend getting Linksys anymore. This thing is buggy and won't allow me to use wep or wpa. I tried with my 2wire card , usb adapter, and linksys adapter. No such luck.
I have disabled ssid broadcast and enabled mac filter to help from be found but sometimes NS still detects it from my work truck.

Oh and yea you smell a noob :p
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Postby lincomatic » Thu Jul 10, 2003 7:28 pm

Originally posted by sint@x
Oh and yea you smell a noob :p

welcome, n00b. we don't all bite ;)
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Postby Madhadder » Fri Jul 11, 2003 12:08 am

At least not hard enough to leave a mark......... :D

We don't mind "Noobs", that actually contribute to the forums....

It's the ones who dont' do the research and ask for help to
do Illeagal stuff.. These "Noobs" will ALWAYS face the
rath of the General....
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Postby Thorn » Tue Jul 22, 2003 6:08 am

Back on topic...

Rob Flickenger, the amazing in inventor of the Pringle Cantenna and co-developer of NoCat, has just released a firmware generator for the WRT54G. Quoting Mr. Flickenger from the NoCat list:

Code: Select all
Allright, here it is:


A 5k perl script that generates firmware that the WRT54G will accept.


* Perl, and String::CRC32 (from CPAN)
* mkcramfs, v1.1 (from SourceForge)
* wget, if you want it to download firmware from Linksys for you


* Auto-download the original firmware from Linksys
* Extract the original CramFS for your own edification
* Builds a new CramFS root on the fly, computes the proper header, and
generates the firmware

I've used it to make a couple of good copies so far, but it's still
very alpha.  It is released under the GPL.



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Postby hoof_hearted » Wed Aug 06, 2003 8:00 pm

So does this mean you could make your own firmware (with your code changes) that might really use all zeros for the encryption keys behind the scenes. Then all those people that you drive past with the SSID of 'linksys' (and I bet a password of admin) and set em up with some custom firmware. (Maybe the advanced version would just use a bogus checkbox for remote admin and add some code that would try and send a mail announcement to

This seems to be some scary potential.
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