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Re: "hacking" a wireless ap firmware
From: Michael Puchol <mpuchol () sonar-security com>
Date: Fri, 07 Jul 2006 18:59:57 +0200

Hi,

You can start looking here:

http://www.openwrt.org

and

http://www.dd-wrt.org

which are alternative linux-based firmware, supporting many features, such as captive portals, IDS systems, etc.

However, the simplest way to "hack" an AP to perform nasty things would be to change the DHCP DNS entries to ones you own, so all clients would be checking against your servers...this is why I use static DNS even with DHCP. An exception to this is when you have a captive portal, which must supply you its own DNS entries, otherwise it cannot perform the function it is designed for.

Regards,

Mike

Norbert Fran├žois wrote:
Hi everybody...

After a discussion with a friend of mine, I argued that it was
possible to change the behaviour of a firmware, so that an attacker
could put a backdoor inside, for instance :S...

Perhaps I spoke a bit quickly, 'cause now I feel a bit lost in
modifying the firmware :(.

Basically, every access point proposes you to update its firmware...
Most of the fime, these firmware are sold in a *.bin format. After
having tried to search for relevant strings in the bin, disassembling
it and loosing time, I'm still at the same point :(.

Do you have any experience in firmware modification ? Do you know in
which language firwares are written ? Maybe tryin' a decompilation
could help me...

Thanks a lot

Norbert

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