In ImageMagick, there are outside the range of representable values of type 'long' and signed integer overflow at MagickCore/quantize.c.
Name: Suhwan Song (Seoul National University)
In IntensityCompare() of /magick/quantize.c, there are calls to PixelPacketIntensity() which could return overflowed values to the caller when ImageMagick processes a crafted input file. To mitigate this, the patch introduces and uses the ConstrainPixelIntensity() function, which forces the pixel intensities to be within the proper bounds in the event of an overflow.
I marked this as impact Low because while the issue could potentially cause an impact to availability, none was demonstrated - UndefinedBehaviorSanitizer just showed that there is undefined behavior present.
This flaw is out of support scope for Red Hat Enterprise Linux 5, 6, and 7. Inkscape is not affected because it no longer uses a bundled ImageMagick in Red Hat Enterprise Linux 8. For more information regarding support scopes, please see https://access.redhat.com/support/policy/updates/errata .
Created ImageMagick tracking bugs for this issue:
Affects: epel-8 [bug 1901251]
Affects: fedora-all [bug 1901252]
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):