DescriptionThe fill_threshhold_buffer function in base/gxht_thresh.c in Artifex Software, Inc. Ghostscript 9.20 allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted PostScript document.
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
Debian Bugs860869

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ghostscript (PTS)stretch9.26a~dfsg-0+deb9u6fixed
stretch (security)9.26a~dfsg-0+deb9u7fixed
buster, buster (security)9.27~dfsg-2+deb10u4fixed
bullseye (security), bullseye9.53.3~dfsg-7+deb11u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[wheezy] - ghostscript <no-dsa> (Not directly reproducible, to re-evaluate once the upstream fix is known);h=362ec9daadb9992b0def3520cd1dc6fa52edd1c4
I got the reproducer file from the bug submitter and tried to reproduce it.
Results are the following: sid/stretch with 9.20~dfsg-3 are
affected, it even segfaults. But with wheezy 9.05~dfsg-6.3+deb7u2
and jessie 9.06~dfsg-2+deb8u4, we have no segfault and valgrind
reports no buffer overrun. -- Raphael Hertzog

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