Heap Buffer Overflow in FFmpeg RIST Protocol

Executive Summary

This is a heap buffer overflow in FFmpeg's RIST protocol reader (libavformat/librist.c). The librist_read() function ignores the size argument and copies the full received payload into a caller-provided buffer, causing an overflow if the payload exceeds the buffer size. It is triggered via the async:rist:// URL scheme when a remote sender sends a packet with a payload larger than the buffer.

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Detection Guidance

Detecting this vulnerability requires checking the FFmpeg version and monitoring network traffic for RIST protocol usage. Inspect FFmpeg binaries for versions before commit 1c10bcc. Use network monitoring tools like Wireshark to capture and analyze RIST protocol packets for unusually large payloads.

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Impact Analysis

A remote attacker could exploit this to execute arbitrary code, crash the application, or gain unauthorized access to system resources. Since FFmpeg is widely used for media processing, this could affect servers, applications, or devices processing RIST streams.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling remote code execution or unauthorized data access if exploited. A heap buffer overflow may allow attackers to read or write sensitive memory, potentially exposing personal data covered under GDPR or protected health information under HIPAA.

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Mitigation Strategies

Immediately update FFmpeg to the latest version or apply the patch from commit 1c10bcc. Disable the async:rist:// URL scheme if not required. Monitor network traffic for suspicious RIST packets and restrict access to RIST protocol endpoints.

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