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This page will be dedicated to a general overview, descriptions, and information related to the Netgear NTV200-100NAS media player.
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After analyzing and extracting the firmware by way of dumping the NAND flash, we discovered a flaw that allowed for code executing as root. This is a bit more complex than others, but it is still very straightforward to do.
Any of the "apps" on the device (flash applets) are downloaded from this url: http://updates1.netgear.com (yes, it's HTTP)
Using dnsspoof, we can spoof that url to point to a webserver that we control.
On that webserver, create the directory structure outlined below:
Since we will be using the Texas Hold'em app to gain root, download and place in that folder this file: http://updates1.netgear.com/ntv200/us/game/texas.tar
This is a two step process:
- Step 1
- Place a symlink labeled "hackme" pointing to /
- Step 2
- Drop the actual payload through the symlink
So, we first modify texas.tar - Add a symlink of hackme to / Copy that as texas.tar in the directory above, save it, and click the Texas Hold'em app. It will black screen, hit home a few times. Delete the texas.tar, and replace it with the new texas.tar that is created below:
Modify the tar, replace the symlink with a a folder structure:
Add a file in that directory called rcc.user calling telnet
This file is run via bash as root and will persist at every boot. Login using the username root, no password!