ESPTouch is a connection protocol for internet of things devices. In the ESPTouchV2 protocol, while there is an option to use a custom AES key, there is no option to set the IV (Initialization Vector) prior to versions 5.3.2, 5.2.4, 5.1.6, and 5.0.8. The IV is set to zero and remains constant throughout the product's lifetime. In AES/CBC mode, if the IV is not properly initialized, the encrypted output becomes deterministic, leading to potential data leakage. To address the aforementioned issues, the application generates a random IV when activating the AES key starting in versions 5.3.2, 5.2.4, 5.1.6, and 5.0.8. This IV is then transmitted along with the provision data to the provision device. The provision device has also been equipped with a parser for the AES IV. The upgrade is applicable for all applications and users of ESPTouch v2 component from ESP-IDF. As it is implemented in the ESP Wi-Fi stack, there is no workaround for the user to fix the application layer without upgrading the underlying firmware.

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-327

CWE-909

https://github.com/EspressifApp/EsptouchForAndroid/tree/master/esptouch-v2

https://github.com/EspressifApp/EsptouchForIOS/tree/master/EspTouchDemo/ESPTouchV2

https://github.com/espressif/esp-idf/commit/4f85a2726e04b737c8646d865b44ddd837b703db

https://github.com/espressif/esp-idf/commit/8fb28dcedcc49916a5206456a3a61022d4302cd8

https://github.com/espressif/esp-idf/commit/d47ed7d6f814e21c5bc8997ab0bc68e2360e5cb2

https://github.com/espressif/esp-idf/commit/de69895f38d563e22228f5ba23fffa02feabc3a9

https://github.com/espressif/esp-idf/commit/fd224e83bbf133833638b277c767be7f7cdd97c7

https://github.com/espressif/esp-idf/security/advisories/GHSA-wm57-466g-mhrr

https://github.com/espressif/esp-idf/tree/master/components/esp_wifi