Global-buffer-overflow in libxaac: iusace_quantize_lines

Background

libxaac is an open-source library that provides an implementation of the Advanced Audio Coding (AAC) audio compression standard. It is commonly used in multimedia applications to encode and decode AAC audio streams. The library offers various functions for audio processing, including quantization and spectral analysis. However, a vulnerability has been discovered in the library's iusace_quantize_lines function, which can lead to a global buffer overflow.

Vulnerability Detail

The vulnerability in libxaac's iusace_quantize_lines function allows for a global buffer overflow when reading 4 bytes. This can be triggered by a specific input, causing the function to crash. The issue was reported through the OSS-Fuzz project, and the crash state indicates that the overflow occurs within the iusace_quantize_spec and iusace_fd_encode functions as well. The impact of this vulnerability could potentially lead to arbitrary code execution or denial of service.

Workaround

As a workaround, developers can implement input validation and bounds checking in their applications that utilize libxaac. By ensuring that the input to the iusace_quantize_lines function is within the expected range, the buffer overflow can be prevented. Here is an example of how input validation can be performed in C:

void process_audio_data(int* audio_data, int num_samples) {
  if (num_samples > MAX_SAMPLES) {
    // Handle error or truncate the input
    return;
  }

  iusace_quantize_lines(audio_data, num_samples);
}

Conclusion

In conclusion, libxaac is vulnerable to a global buffer overflow in the iusace_quantize_lines function. This vulnerability can have severe consequences, including arbitrary code execution or denial of service. It is crucial to update to a fixed version of libxaac or implement input validation to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.

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