CVE-2024-53845 – AES/CBC Constant IV Vulnerability in ESPTouch v2

https://notcve.org/view.php?id=CVE-2024-53845

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. • 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/fd224e83bbf133833638b277c767b • CWE-327: Use of a Broken or Risky Cryptographic Algorithm CWE-909: Missing Initialization of Resource •