Heap-based Buffer Over-read in ReadMNGImage in GraphicsMagick 1.4 snapshot-20171217 Q8

CVE-2017-17915 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

In GraphicsMagick 1.4 snapshot-20171217 Q8, there is a heap-based buffer over-read in ReadMNGImage in coders/png.c, related to accessing one byte before testing whether a limit has been reached.

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