DescriptionA security feature bypass exists in Azure SSH Keypairs, due to a change in the provisioning logic for some Linux images that use cloud-init, aka 'Azure SSH Keypairs Security Feature Bypass Vulnerability'.
SourceCVE (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)
Debian Bugs926043

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
cloud-init (PTS)buster20.2-2~deb10u2fixed
bookworm, sid22.4.2-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
cloud-initsourcejessie(not affected)


[stretch] - cloud-init <no-dsa> (Doesn't affect default provisioning for Azure, only limited use cases)
[jessie] - cloud-init <not-affected> (version uses a different mechanism to set public keys.)

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