CVE-2021-20206

NameCVE-2021-20206
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs983659

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
golang-github-appc-cni (PTS)stretch0.3.0+dfsg-1vulnerable
buster0.4.0+dfsg-1vulnerable
bullseye, sid0.8.1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
golang-github-appc-cnisource(unstable)0.8.1-1983659

Notes

[buster] - golang-github-appc-cni <no-dsa> (Minor issue; can be fixed via point release)
https://github.com/containernetworking/cni/pull/808
https://bugzilla.redhat.com/show_bug.cgi?id=1919391
check details, impact on docker.io?

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