Device inspection to remote root

Device inspection To remote root

Uncovering the sekritz of proprietary software on a fixed wireless terminal and weap0nizing them into a remote exploit

Where What Who

Ruxmon Melbourne Device Inspection to remote root

Tim Noise

tIM NOISE

• twitter/dnoiz1 • github/dnoiz1 • mIRC/dnz • streetz/notorious D N Z • [email protected]

Internet subscriber and pirate impersonator

Fixed Wireless Terminals

• Linux Based • System on Chip • Provide PoTS and ADSL • 3G/LTE Backhaul • Battery and Solar • Remote Managed • Deployed in Clusters

For people without copper or fiber

External Connectors

• Ether over USB

(DHCP) • Aerial socket • SIM Card slot • 2 RJ11 ports for

ADSL CPE and PoTS

Things we can probe

External Connectors

• SIM Card slot • 2 Management Ethernet Ports (NO DHCP)

• 2 RJ11 power management ports

Things we can probe

Whats Inside?Rub the torx and the genie comes out

CPU

NAND0

NAND1

UART

Removable CF Card for /

Whats Inside?Rub the torx and the genie comes out

Mini PCMCIA3G Modem

Boot ProcessRedboot the buspirate, yarr

GND

RX

TX

VCC / NC

Gaining ROOTalways want that uid 0 - the usual tricks

• Removable root Media • hashcat / jtr

• kernel paramaters • init=/bin/sh • single user mode

• Lucky for us, the root password is

printed on the PCB (not even joking)

MANAGEMENT InTERFACEthe dububdub

MANAGEMENT InTERFACEthe dububdub

Logging INConnecting using the management USB interface

PortsANDProcessessWhats running on this thing?



Back to the SourceWhere is this process stored and launched from

DECOMPYLEUsing multiline strings as comments is great!

Vulnerability 1: UNPICKLESerializing objects its so convenient for passing them over a udp socket

Vulnerability 1: UNPICKLESerializing objects its so convenient for passing them over a udp socket

Putting it all Togethermaking use of our discovered vulnerabilities




DEMO

One Step FURTHER

• Connect back payloads • Dial 1900 numbers for profit • UDP broadcast the attack • Intercept data and telephony • Insta-botnet / onion network • Other bad things

For internet bad men

QUESTIONS?

tIM NOISE

• twitter/dnoiz1 • github/dnoiz1 • mIRC/dnz • streetz/notorious D N Z • [email protected]

Internet subscriber and pirate impersonator