An integer overflow issue was discovered in ImageMagick's ExportIndexQuantum() function in MagickCore/quantum-export.c. Function calls to GetPixelIndex() could result in values outside the range of representable for the 'unsigned char'. When ImageMagick processes a crafted pdf file, this could lead to an undefined behaviour or a crash.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://github.com/ImageMagick/ImageMagick/pull/3083 | patch third party advisory issue tracking |
| https://github.com/ImageMagick/ImageMagick/commit/5af1dffa4b6ab984b5f13d1e91c95760d75f12a6 | third party advisory patch |
| https://github.com/ImageMagick/ImageMagick6/commit/553054c1cb1e4e05ec86237afef76a32cd7c464d | third party advisory patch |
| https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html | mailing list |