In ImageMagick 7.0.8-67 there is a heap-buffer-overflow at coders/png.c:9026:46 in WriteOnePNGImage.
WriteOnePNGImage() from coders/png.c (the PNG coder) has a for loop with an improper exit condition that can allow an out-of-bounds READ via heap-buffer-overflow. This occurs because it is possible for the colormap to have less than 256 valid values but the loop condition will loop 256 times, attempting to pass invalid colormap data to the event logger. The patch replaces the hardcoded 256 value with a call to MagickMin() to ensure the proper value is used.
This could impact application availability when a specially crafted input file is processed by ImageMagick.
Name: Suhwan Song (Seoul National University)
Created ImageMagick tracking bugs for this issue:
Affects: epel-8 [bug 1901233]
Affects: fedora-all [bug 1901235]
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):
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.