Online Digital Forensics Courses and Labs

Funded by National Science Foundation (NSF)
Funded by Florida Center for Cybersecurity (Cyber Florida) Capacity Building Program

IoT Remote Access Attack


Courtesy of Manufacturers

Instructor: Dr. Yier Jin, 352-294-0401, yier.jin@ece.ufl.edu

Prerequisite:

  • Knowledge of basic usage of a command line.
  • Knowledge of basic usage of Linux machine.

Goals of this tutorial:

In this tutorial, the learner will learn how to use SSH to access a device and modify its firmware. They will crack a device's password using Telnetd Brute Force and hack a password-protected RTSP stream. After cracking the device's password, the learner can perform a physical attack through a serial port. These will be done using a Xiaofang camera.

Overview:

  • SSH into the Xiaofang camera and modify its firmware
  • Crack the camera's password using Telnetd Brute Force
  • Hack into the camera's password-protected RTSP stream

Hardware Needed:

  • Xiaofang smart camera, made by Xiaomi
  • TL-WN725N wireless adapter
  • SD Card

Software Needed:

  • Virtual Box (if you do not have Virtual Box installed please see Lab Setup). The system image is provided in the "environment" folder of the flash drive.
  • If performing this tutorial remotely, the necessary files can be downloaded here.
  • Win32DiskImager (Disk image burner for windows, see 'environment' of flash drive)
  • VLC Player (provided in test operating system)
  • Hydra (provided in test operating system)
  • Mi Home App (Download from AppStore, Android/iOS supported, account:sslab.ece.ufl@gmail.com/Ww36306834). You can use the provided account or create your own account.

Environment Setup:

Setting up the Virtual Machine:

Open Virtual Box and go to File/Import Appliance. Underneath of "Appliance to Import" select the IoT Security Ubuntu VM.ova. Boot up "IoT Security Ubuntu VM" and login with account: security/enjoy.

Figure 1: VirtualBox homescreen showing IoT Security Ubuntu VM

Plug in the TL-WN725N wireless adapter and connect it to the VM by going to Devices/USB and selecting "Realtek 802.11n WLAN Adapter".

Figure 2: Selecting the network adapter

Setting Up the Wireless Shared Network within Test Operating System:

To get the wireless interface name open Terminal and enter the following command:

iwconfig

You might need a few minutes to wait for the current output results with the wireless interface information. The 'iwconfig' command might be blocked while acquiring results but it's ok. You should see the following outputs in Terminal:

Figure 3: "iwconfig" command output

Type the following command to setup a shared wireless network for later use:

sudo create_ap wlx74da38e1ddae enp0s3 hotspot_name changeme

Please Note:

If create_ap gets stuck at the unmanage device step, try using the following command to fix it:

sudo create_ap --fix-unmanaged

Figure 4: "create_ap" command output

Use your phone to connect to and test this shared network. Please ALWAYS keep this terminal window open to maintain the shared wireless network.


Camera Setup:

Connecting the Xiaofang Camera to the Wi-Fi without the Mi Home App:

Visit the following website: https://codepen.io/ril3y/full/gXyzmO/. Fill out the SSID and password using the same hotspot name and password you used earlier to generate the QR code.

Figure 5: QR code generator

Plug the power cable into the Xiaofang camera, press the setup button on the bottom of the camera, and face the camera to the QR code. Wait until the LED keeps flashing blue instead of yellow.

If this doesn't work, please setup the Xiaofang camera with the Mi Home App. If this worked please proceed to the Remote Attack section.

Setting Up the Xiaofang Camera with the Mi Home App:

Make sure that your phone is still connected to the shared wireless network you created. Download and open the "Mi Home" app on your phone.

Log in to Mi Home with the account sslab.ece.ufl@gmail.com/Ww36306834. After logging in go to the "Profile" tab and switch the region to "Mainland China".

Press "add device" and then "add manually" to open the Xiaofang setup page. Press the "Xiaofang SMART camera" to start the Xiaofang Setup routine. Enter the password of the shared wireless network.

Unbox the Xiaofang camera and connect it to the power cable if it is not already. Press the reset button on the bottom of the Xiaofang camera and face the generated QR code to camera. After voice notice from camera, press the "Heard Scanned Successfully".

Leave the app open. Don't worry about the connection process because due to the Xiaomi regulation you can never successfully pair the Xiaofang camera outside of the Chinese mainland. The goal of this procedure is to make the Xiaofang Camera connect with our wireless network. Check the Xiaofang camera connection either with the blinking blue LED on the back of camera, or with the output debug information of the "create_ap" terminal window.


Remote Attack:

Downloading the Modified Firmware Image:

The modified firmware image is already downloaded and placed into the "environment/Xiaofang" folder. The image name is "fanghacks_v0.2.0.img".

Preparing an SD Card with the firmware (Flashing the SD Card):

An SD card has already been flashed with the necessary firmware. In case you need to reflash the SD card read the following paragraph:

Insert the 4GB micro SD card into your computer. Launch Win32DiskImager and choose the right image file and device, fanghacks_v0.2.0.img and micro SD card respectively. Click "Write".

Placing the SD card into the camera:

Boot the device without the SD card. Wait until the blue LED keeps flashing and then insert the SD card. If the SD card is mounted correctly you should hear a "Ding Ding" sound. If not, Please do not proceed to the next step and reflash the micro SD card.

Note: To prevent the SD Card form being mounted incorrectly please do not boot the device with the SD card inserted and then re-insert it.

Finding the Xiaofang camera IP address:

Open a new terminal window and use the following command to check the Xiaofang camera IP address:

cat /var/log/syslog | grep dnsmasq-dhcp

Usually the last "dnsmasq -dhcp REQUEST" message contains the IP address of the recently connected Xiaofang camera. Since you have connected your phone earlier it may show up. As seen in the image below 192.168.12.200 wasn't selected as the Xiaofang's IP address because the last log indicates it belongs to an android phone.

Figure 6: Finding the Xiaofang's IP Address

Verifying the IP address just found:

To verify the IP address check the camera 80 port status using the following command inserting the IP address you found for "IP_ADDRESS":

telnet IP_ADDRESS 80

You should see a similar output to the following image:

Figure 7: Verifying the Xiaofang's IP Address

Open Firefox and visit "http://device-ip/cgi-bin/hello.cgi" where "device-ip" is your camera's IP address. You should see the following page:

Figure 8: Page opened in Firefox

Enabling the SD card firmware:

To enable the SD card firmware visit "http://device-ip/cgi-bin/status" and click "Apply". You should see the screen below:

Figure 9: Enabling the firmware

Configuration to Enable SSH and RTSP Service:

Connect the Xiaofang camera with Wi-Fi, and visit "http://device-ip/cgi-bin/scripts", where device-ip is the IP address for your camera. Start "00-stop-cloud", "11-dropbear", and "20-rtsp-server". Check that those three statuses are green except for "00-stop-cloud", if not please call for assistance.

Verify the firmware is running by attempting to SSH into the camera with the following command:

ssh root@device-ip

You will see that the camera is password protected.

Attempting to view the camera's RTSP stream

The Real Time Streaming Protocol (RTSP) is a network control protocol designed for use in entertainment and communications systems to control streaming media servers. The RTSP service within the Xiaofang system can give us the ability to watch the real-time video stream shot by the camera.

Launch VLC Player and navigate to Media/Open Network Stream. Open the following stream "rtsp://my_ip:554/media/stream1", where my_ip is your camera's ip, then check the real-time camera video stream.

Figure 10: VLC Menu

You can see the RTSP is protected by password, preventing you from viewing the stream.

Figure 11: Stream protected by password

With the SSH/Telnetd access, attendees can find out the RTSP password by either checking the process parameters or the configuration file of Xiaofang system.

SSH/Telnetd brute force:

Provided are a SSH/Telnetd brute force script called "hydra" and an IoT device weak password list which contains the default SSH password of Xiaofang. Go to "~/Work/ssh" by executing

cd ~/Work/ssh

Once there, execute the following command to view the list of passwords that hydra will use to attemp to log in to the camera:

cat ssh-betterdefaultpasslist.txt

Now run hydra to perform a brute force attack on the password for the Xiaofang camera:

hydra -V -C ssh-betterdefaultpasslist.txt -t 4 device-ip ssh

Figure 12: Running Hydra

Once succeeded, we now know the password for the camera. We can have remote access to modify and check the online system of the Xiaofang camera. Use the following command to SSH into the device and verify the cracked password:

ssh root@device-ip

When prompted for the password enter the password you discovered from the brute force attack.

RTSP Hacking:

As seen before, the RTSP service is protected by password. Now that you have SSH access to the camera the RTSP password can be discovered by checking the process parameters or the configuration file of Xiaofang system.

Login to the Xiaofang camera SSH service with the cracked password, if you are not already, and then execute the following command to locate the suspicious process:

ps | grep rtsp

Figure 13: Username and Password found

The username and password should be seen after one of the rtsp-related files has been found. You can also check the configuration file "/media/mmcblk0p2/data/etc/scripts/20-rtsp-server" to find out corresponding password.

Use the username and password you found to view the real time stream feed captured by your Xiaofang camera.


Take Away:

References: