CVE-2020-6078

Name	CVE-2020-6078
Description	An exploitable denial-of-service vulnerability exists in the message-parsing functionality of Videolabs libmicrodns 0.1.0. When parsing mDNS messages in mdns_recv, the return value of the mdns_read_header function is not checked, leading to an uninitialized variable usage that eventually results in a null pointer dereference, leading to service crash. An attacker can send a series of mDNS messages to trigger this vulnerability.
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	DSA-4671-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
vlc (PTS)	buster	3.0.17.4-0+deb10u1	fixed
	buster (security)	3.0.17.4-0+deb10u2	fixed
	bullseye (security), bullseye	3.0.18-0+deb11u1	fixed
	bookworm, sid	3.0.18-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
libmicrodns	source	(unstable)	(unfixed)
vlc	source	jessie	(unfixed)	end-of-life
vlc	source	stretch	3.0.10-0+deb9u1		DSA-4671-1
vlc	source	buster	3.0.10-0+deb10u1		DSA-4671-1
vlc	source	(unstable)	3.0.8-4

Notes

[jessie] - vlc <end-of-life> (Not supported in jessie LTS)
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1001
These were addressed on the source level in 3.0.9, but 3.0.8-4 disables the plugin