CVE-2021-20206

Name	CVE-2021-20206
Description	An improper limitation of path name flaw was found in containernetworking/cni in versions before 0.8.1. When specifying the plugin to load in the 'type' field in the network configuration, it is possible to use special elements such as "../" separators to reference binaries elsewhere on the system. This flaw allows an attacker to execute other existing binaries other than the cni plugins/types, such as 'reboot'. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	983659

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-github-appc-cni (PTS)	buster	0.4.0+dfsg-1	vulnerable
	bullseye	0.8.1-1	fixed
	sid, trixie, bookworm	1.1.2-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-github-appc-cni	source	(unstable)	0.8.1-1			983659

Notes

[buster] - golang-github-appc-cni <postponed> (Limited support, minor issue)
[stretch] - golang-github-appc-cni <no-dsa> (Minor issue)
https://github.com/containernetworking/cni/pull/808
https://bugzilla.redhat.com/show_bug.cgi?id=1919391