Uninitialized Memory Use in FFmpeg C93 Video Decoder

Executive Summary

This vulnerability is in FFmpeg version 9.0.2 and earlier. It involves an uninitialized memory use issue in the C93 video decoder. The function decode_frame() fails to check how many color table bytes were copied, allowing attackers to provide a crafted truncated Interplay C93 file. This causes draw_n_color() to write uninitialized stack memory into decoded frames, potentially exposing sensitive memory contents.

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Detection Guidance

This vulnerability involves uninitialized memory use in FFmpeg's C93 video decoder when processing crafted Interplay C93 files. Detection requires analyzing media files processed by FFmpeg versions up to 9.0.2 for potential corruption or memory disclosure. Check FFmpeg version with 'ffmpeg -version' and inspect files decoded with '-c:v c93' for anomalies.

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Impact Analysis

If exploited, this vulnerability could allow attackers to read sensitive memory contents from the system running FFmpeg. This might lead to information disclosure, such as passwords or encryption keys. Attackers could use this to gain further access or escalate privileges on the affected system.

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Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by potentially exposing personal or sensitive data. GDPR requires protection of personal data, and a breach could lead to violations. HIPAA mandates safeguarding protected health information, and uninitialized memory exposure may result in non-compliance if exploited.

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Mitigation Strategies

Upgrade FFmpeg to the latest version beyond 9.0.2 where this issue is resolved. Avoid processing untrusted Interplay C93 files until patched. Monitor for unusual memory patterns in decoded frames if using affected versions.

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