CVE-2020-25674

Name	CVE-2020-25674
Description	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. This flaw affects ImageMagick versions prior to 7.0.8-68.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2523-1, DLA-3357-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
imagemagick (PTS)	bullseye	8:6.9.11.60+dfsg-1.3+deb11u4	fixed
	bullseye (security)	8:6.9.11.60+dfsg-1.3+deb11u3	fixed
	bookworm	8:6.9.11.60+dfsg-1.6+deb12u2	fixed
	bookworm (security)	8:6.9.11.60+dfsg-1.6+deb12u1	fixed
	trixie	8:6.9.13.12+dfsg1-1	fixed
	sid	8:7.1.1.39+dfsg1-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
imagemagick	source	stretch	8:6.9.7.4+dfsg-11+deb9u11	DLA-2523-1
imagemagick	source	buster	8:6.9.10.23+dfsg-2.1+deb10u2	DLA-3357-1
imagemagick	source	(unstable)	8:6.9.11.24+dfsg-1

Notes

https://github.com/ImageMagick/ImageMagick/issues/1715
ImageMagick: https://github.com/ImageMagick/ImageMagick/commit/67b871032183a29d3ca0553db6ce1ae80fddb9aa
ImageMagick6: https://github.com/ImageMagick/ImageMagick6/commit/2fdff8e040cd4401498d89f3c3d1f89cffd118b0