CVE-2020-27771

NameCVE-2020-27771
DescriptionIn RestoreMSCWarning() of /coders/pdf.c there are several areas where calls to GetPixelIndex() could result in values outside the range of representable for the unsigned char type. The patch casts the return value of GetPixelIndex() to ssize_t type to avoid this bug. This undefined behavior could be triggered when ImageMagick processes a crafted pdf file. Red Hat Product Security marked this as Low severity because although it could potentially lead to an impact to application availability, no specific impact was demonstrated in this case. 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)
ReferencesDLA-2602-1
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+deb9u8vulnerable
stretch (security)8:6.9.7.4+dfsg-11+deb9u13fixed
buster, buster (security)8:6.9.10.23+dfsg-2.1+deb10u1vulnerable
bullseye, sid8:6.9.11.60+dfsg-1.3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
imagemagicksourcestretch8:6.9.7.4+dfsg-11+deb9u12DLA-2602-1
imagemagicksource(unstable)8:6.9.11.24+dfsg-1

Notes

[buster] - imagemagick <ignored> (Minor issue)
https://github.com/ImageMagick/ImageMagick/issues/1753
ImageMagick: https://github.com/ImageMagick/ImageMagick/commit/872ffe6d0131beec8b47568a4874ffaca91a872e
ImageMagick: https://github.com/ImageMagick/ImageMagick/commit/9dd1c7e1f8f6c137bfd3293be2554f59456c7b62
ImageMagick6: https://github.com/ImageMagick/ImageMagick6/commit/a07ecde4c1c3a3efaa628434adc903295f6bb2b3

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