CVE-2020-27756

NameCVE-2020-27756
DescriptionIn ParseMetaGeometry() of MagickCore/geometry.c, image height and width calculations can lead to divide-by-zero conditions which also lead to undefined behavior. This flaw can be triggered by a crafted input file processed by ImageMagick and could impact application availability. The patch uses multiplication in addition to the function `PerceptibleReciprocal()` in order to prevent such divide-by-zero conditions. This flaw affects ImageMagick versions prior to 7.0.9-0.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
imagemagick (PTS)stretch8:6.9.7.4+dfsg-11+deb9u8fixed
stretch (security)8:6.9.7.4+dfsg-11+deb9u13fixed
buster, buster (security)8:6.9.10.23+dfsg-2.1+deb10u1vulnerable
bookworm, sid, bullseye8:6.9.11.60+dfsg-1.3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
imagemagicksourcestretch(not affected)
imagemagicksource(unstable)8:6.9.11.24+dfsg-1

Notes

[buster] - imagemagick <ignored> (Minor issue)
[stretch] - imagemagick <not-affected> (Vulnerable code introduced later)
https://github.com/ImageMagick/ImageMagick/issues/1725
ImageMagick: https://github.com/ImageMagick/ImageMagick/commit/f35eca82b0c294ff9d0ccad104a881c3ae2ba913
ImageMagick6: https://github.com/ImageMagick/ImageMagick6/commit/d3d96f05950275b916207bf9df03640ef3e9fd6e
Introduced in https://github.com/ImageMagick/ImageMagick6/commit/7dd318e6f7f86eb41e474e3131c59ea26af6c1b2 (6.9.9-34)

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