NULL Pointer Dereference Affecting ffmpeg package, versions [0,]
Threat Intelligence
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- published19 Feb 2025
- disclosed18 Feb 2025
- credit0x20z
Introduced: 18 Feb 2025
NewCVE-2025-25471 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
A fix was pushed into the master branch but not yet published.
Overview
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