Unsigned Integer Overflow in ESP32-audioI2S

Executive Summary

This is an unsigned integer overflow in the ESP32-audioI2S library version 3.4.5 where buffer size calculations overflow due to UINT16_MAX multiplications. The overflow creates undersized PSRAM buffers, leading to heap out-of-bounds access during audio operations.

Useful 0 Not Useful 0

Detection Guidance

Detect this vulnerability by checking if your ESP32-audioI2S library version is 3.4.5. Inspect the src/Audio.cpp file for buffer size calculations using UINT16_MAX * 10 or UINT16_MAX without overflow checks. Use Address Sanitizer (ASAN) during compilation to identify heap out-of-bounds access during audio playback.

Useful 0 Not Useful 0

Impact Analysis

It causes denial of service by crashing ESP32 devices or freezing audio streams. It may also enable heap corruption, potentially allowing remote code execution or leaking sensitive audio data during normal playback of standard audio formats.

Useful 0 Not Useful 0

Mitigation Strategies

Upgrade the ESP32-audioI2S library to a patched version. Add bounds checking to buffer size calculations to prevent unsigned integer overflow. Implement heap memory validation before audio operations. Monitor device logs for heap corruption or out-of-bounds errors during audio processing.

Useful 0 Not Useful 0