Buffer Overflow in schreibfaul1 ESP32-audioI2S

Executive Summary

This vulnerability is a heap buffer overflow in the ESP32-audioI2S library version 3.4.5, specifically in the UnpackFrameHeader() function of the MP3 decoder. It occurs when attacker-controlled index values from an MP3 bitstream are used to access arrays without proper range checks, leading to out-of-bounds memory writes and potential heap corruption.

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Detection Guidance

Detecting this vulnerability requires analyzing the ESP32-audioI2S library for buffer overflows during MP3 decoding. Check for crashes or memory corruption when processing MP3 files. Monitor heap usage and look for out-of-bounds writes in the UnpackFrameHeader() function. Use static analysis tools like AddressSanitizer or Valgrind to detect memory issues during MP3 file processing.

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Impact Analysis

An attacker could exploit this by sending a maliciously crafted MP3 file to a vulnerable device. This could result in arbitrary code execution or a denial-of-service condition, potentially allowing the attacker to take control of the device or crash it.

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Compliance Impact

This vulnerability primarily impacts device security and reliability rather than directly violating compliance standards like GDPR or HIPAA. However, it could indirectly affect compliance by enabling arbitrary code execution or denial-of-service attacks on devices processing audio data, potentially leading to unauthorized access to sensitive information or disruption of critical services. Organizations using vulnerable ESP32-audioI2S devices may need to assess whether this risk aligns with their security and data protection policies.

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Mitigation Strategies

Immediately update the ESP32-audioI2S library to a patched version if available. Avoid processing untrusted MP3 files on vulnerable devices. Implement input validation for MP3 frame headers to prevent out-of-bounds access. Use memory-safe programming practices and enable compiler protections like stack canaries and DEP.

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