CVE-2020-27760

Name	CVE-2020-27760
Description	In `GammaImage()` of /MagickCore/enhance.c, depending on the `gamma` value, it's possible to trigger a divide-by-zero condition when a crafted input file is processed by ImageMagick. This could lead to an impact to application availability. The patch uses the `PerceptibleReciprocal()` to prevent the divide-by-zero from occurring. This flaw affects ImageMagick versions prior to ImageMagick 7.0.8-68.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DLA-2523-1
NVD severity	medium

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
imagemagick (PTS)	stretch	8:6.9.7.4+dfsg-11+deb9u8	vulnerable
	stretch (security)	8:6.9.7.4+dfsg-11+deb9u11	fixed
	buster, buster (security)	8:6.9.10.23+dfsg-2.1+deb10u1	vulnerable
	bullseye, sid	8:6.9.11.60+dfsg-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
imagemagick	source	stretch	8:6.9.7.4+dfsg-11+deb9u11		DLA-2523-1
imagemagick	source	(unstable)	8:6.9.11.24+dfsg-1

Notes

[buster] - imagemagick <ignored> (Minor issue)
https://github.com/ImageMagick/ImageMagick/issues/1717
ImageMagick: https://github.com/ImageMagick/ImageMagick/commit/c5fcdea6a6ae27cf3db20c28b176e87b1a584e06
ImageMagick6: https://github.com/ImageMagick/ImageMagick6/commit/83cd04f580ccf4cc194813777c1fcfba78e602aa