CVE-2020-16293

Name	CVE-2020-16293
Description	A null pointer dereference vulnerability in compose_group_nonknockout_nonblend_isolated_allmask_common() in base/gxblend.c of Artifex Software GhostScript v9.50 allows a remote attacker to cause a denial of service via a crafted PDF file. This is fixed in v9.51.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	DLA-2335-1, DSA-4748-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ghostscript (PTS)	buster	9.27~dfsg-2+deb10u5	fixed
	buster (security)	9.27~dfsg-2+deb10u6	fixed
	bullseye (security), bullseye	9.53.3~dfsg-7+deb11u2	fixed
	bookworm, sid	10.0.0~dfsg-9	fixed

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

Package	Type	Release	Fixed Version	Origin
ghostscript	source	stretch	9.26a~dfsg-0+deb9u7	DLA-2335-1
ghostscript	source	buster	9.27~dfsg-2+deb10u4	DSA-4748-1
ghostscript	source	(unstable)	9.51~dfsg-1

Notes

https://bugs.ghostscript.com/show_bug.cgi?id=701795
https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=7870f4951bcc6a153f317e3439e14d0e929fd231 (9.51)