Heap Buffer Overflow in FFmpeg VideoToolbox Encoder

Executive Summary

This vulnerability is a heap buffer overflow in FFmpeg versions up to 9.0.2. It occurs in the VideoToolbox encoder component when frames larger than the encoder's dimensions are copied into undersized CVPixelBuffers. Attackers can exploit this by providing input whose resolution increases during processing, leading to crashes or memory corruption.

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Detection Guidance

This vulnerability involves heap buffer overflow in FFmpeg's VideoToolbox encoder when processing frames larger than encoder dimensions. Detection requires monitoring FFmpeg processes for crashes or memory corruption during video encoding tasks. Check logs for segmentation faults or heap corruption errors in FFmpeg logs or system logs.

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Impact Analysis

This vulnerability could allow attackers to crash applications using FFmpeg or corrupt memory, potentially leading to arbitrary code execution. Users processing media files with vulnerable FFmpeg versions may experience application failures or system instability.

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Mitigation Strategies

Upgrade FFmpeg to the latest version beyond 9.0.2. Avoid using VideoToolbox encoders for untrusted input or implement input validation to ensure frame dimensions match encoder limits. Monitor FFmpeg processes for abnormal behavior during encoding tasks.

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