There are 4 places in HistogramCompare() in MagickCore/histogram.c where an integer overflow is possible during simple math calculations. This occurs in the rgb values and `count` value for a color. The patch uses casts to `ssize_t` type for these calculations, instead of `int`. This flaw could impact application reliability in the event that ImageMagick processes a crafted input file. This flaw affects ImageMagick versions prior to 7.0.9-0.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25666
Reference (s):
- https://bugzilla.redhat.com/show_bug.cgi?id=1891612
- URL: https://bugzilla.redhat.com/show_bug.cgi?id=1891612
- MLIST:[debian-lts-announce] 20210323 [SECURITY] [DLA 2602-1] imagemagick security update
- URL: https://lists.debian.org/debian-lts-announce/2021/03/msg00030.html