CVE-2012-0920

Name	CVE-2012-0920
Description	Use-after-free vulnerability in Dropbear SSH Server 0.52 through 2012.54, when command restriction and public key authentication are enabled, allows remote authenticated users to execute arbitrary code and bypass command restrictions via multiple crafted command requests, related to "channels concurrency."
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-2456-1
Debian Bugs	661150

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
dropbear (PTS)	buster	2018.76-5+deb10u1	fixed
	buster (security)	2018.76-5+deb10u2	fixed
	bullseye	2020.81-3+deb11u1	fixed
	bookworm	2022.83-1+deb12u1	fixed
	sid, trixie	2024.84-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
dropbear	source	squeeze	0.52-5+squeeze1		DSA-2456-1
dropbear	source	(unstable)	2012.55-1	low		661150

this is limited to authenticated users with enforced command restrictions