full-disclosure - [FD] FFmpeg 7.0+ Type Confusion in FFmpeg Function Pointer Calls (libavformat/utils.c)

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Message-ID: <CAFmK-GxJ_K+swcQ2zdKVbGhqthe48O1bGjtLZ+pSM=yFVVUiqg@mail.gmail.com>
Date: Sun, 7 Sep 2025 01:41:28 -0400
From: Ron E <ronaldjedgerson@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] FFmpeg 7.0+ Type Confusion in FFmpeg Function Pointer Calls
	(libavformat/utils.c)

FFmpeg invokes function pointers through incorrect type casting, leading to
type confusion. UndefinedBehaviorSanitizer logs mismatched signatures in
utils.c:528. Crafted inputs can cause UB, misaligned function dispatch, and
possible arbitrary code execution depending on platform ABI. (FFmpeg 7.0 –
8.0)

*Impact:*

   -

   DoS in normal builds.
   -

   Potential information disclosure or RCE under certain
   compilers/architectures.

*Proof of Concept:*UBSAN_OPTIONS=print_stacktrace=1
ASAN_OPTIONS=abort_on_error=1 ./ffmpeg -i malicious.m3u8 -c copy out.mp4

*Output:*
runtime error: call to function (unknown) through pointer to incorrect
function type
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