NULL Pointer Dereference Affecting ffmpeg package, versions >=0.0.0
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- published19 Feb 2025
- disclosed18 Feb 2025
- credit0x20z
Introduced: 18 Feb 2025
CVE-2025-25471 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
FFmpeg is a FFmpeg static library ruby binding that is compiled for iOS and CocoaPods.
Affected versions of this package are vulnerable to NULL Pointer Dereference due to an integer underflow in the tts_count variable. When sc->tts_count is 0, decrementing it causes it to wrap around to UINT_MAX, leading to an out-of-bounds access.
PoC
git clone https://github.com/FFmpeg/FFmpeg.git
cd FFmpeg
./configure --cc=clang --cxx=clang++ --toolchain=clang-asan --extra-cflags="-I$HOME/ffmpeg_build/include -O0 -fno-omit-frame-pointer -g" --extra-cxxflags="-O0 -fno-omit-frame-pointer -g" --extra-ldflags="-L$HOME/ffmpeg_build/include -fsanitize=address -fsanitize=undefined -lubsan" --disable-optimizations --disable-stripping --enable-cross-compile
make -j30
./ffmpeg -y -i poc tmp.mp4