CVE-2020-27842

Name	CVE-2020-27842
Description	There's a flaw in openjpeg's t2 encoder in versions prior to 2.4.0. An attacker who is able to provide crafted input to be processed by openjpeg could cause a null pointer dereference. The highest impact of this flaw is to application availability.
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-2975-1, DSA-4882-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openjpeg2 (PTS)	stretch	2.1.2-1.1+deb9u4	vulnerable
	stretch (security)	2.1.2-1.1+deb9u7	fixed
	buster, buster (security)	2.3.0-2+deb10u2	fixed
	bullseye	2.4.0-3	fixed
	bookworm, sid	2.4.0-6	fixed

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

Package	Type	Release	Fixed Version	Origin
openjpeg2	source	stretch	2.1.2-1.1+deb9u7	DLA-2975-1
openjpeg2	source	buster	2.3.0-2+deb10u2	DSA-4882-1
openjpeg2	source	(unstable)	2.4.0-1

Notes

https://github.com/uclouvain/openjpeg/issues/1294
Fixed by: https://github.com/uclouvain/openjpeg/commit/fbd30b064f8f9607d500437b6fedc41431fd6cdc (v2.4.0)