CVE-2019-0816

NameCVE-2019-0816
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 code/issues, web search, more)
NVD severitylow (attack range: local)
Debian Bugs926043

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
cloud-init (PTS)jessie0.7.6~bzr976-2fixed
stretch0.7.9-2vulnerable
buster18.3-6fixed
bullseye, sid19.2-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
cloud-initsource(unstable)18.3-6low926043
cloud-initsourcejessie(not affected)

Notes

[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.)
https://code.launchpad.net/~jasonzio/cloud-init/+git/cloud-init/+merge/363445
https://support.microsoft.com/en-us/help/4491476/extraneous-ssh-public-keys-added-to-authorized-keys-file-on-linux-vm

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