full-disclosure - [FD] Broken, Abandoned, and Forgotten Code, Part 5

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Message-ID: <CACxx4MR8uzjZiHABK39UkW2yoGQmMPoNuW-Jft7nwYchH8Jy-w@mail.gmail.com>
Date: Thu, 21 May 2015 13:01:23 -0700
From: Zach C <uid000@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Broken, Abandoned, and Forgotten Code, Part 5

Part 5 is up. In this and the next several parts we start analyzing
the structure of Netgear R6200 firmware updates. We switch over to the
HTTP daemon because it's less broken and a little easier to analyze
than upnpd.

The overall goal is to reverse engineer the firmware format so we can
generate a malicious firmware image to use when exploiting the
SetFirmware SOAP action described in parts 1-4.

Binary patching, emulating with QEMU, and debugging with IDA Pro are
recommended for the next several installments. Here is some
recommended reading to help get that set up:
- Remote Debugging with QEMU and IDA Pro
http://shadow-file.blogspot.com/2015/01/dynamically-analyzing-wifi-routers-upnp.html
- Patching, Emulating, and Debugging a Netgear Embedded Web Server
http://shadow-file.blogspot.com/2015/01/patching-emulating-and-debugging.html

If you missed my post to Full Disclosure where I introduced the
series, here's that:
http://seclists.org/fulldisclosure/2015/May/44

As always I welcome feedback via email or Twitter. I'm @zcutlip.

I hope you enjoy it.

Cheers!
Zach

-- 
:wq!

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