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CVE-2016-20012

Published: 15 September 2021

OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session.

Priority

Negligible

CVSS 3 base score: 5.3

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
Upstream Ignored
(see notes)
Ubuntu 21.10 (Impish Indri) Ignored

Ubuntu 21.04 (Hirsute Hippo) Ignored

Ubuntu 20.04 LTS (Focal Fossa) Ignored

Ubuntu 18.04 LTS (Bionic Beaver) Ignored

Ubuntu 16.04 ESM (Xenial Xerus) Ignored

Ubuntu 14.04 ESM (Trusty Tahr) Ignored

openssh-ssh1
Launchpad, Ubuntu, Debian
Upstream Ignored
(frozen on openssh 7.5p)
Ubuntu 21.10 (Impish Indri) Ignored

Ubuntu 21.04 (Hirsute Hippo) Ignored

Ubuntu 20.04 LTS (Focal Fossa) Ignored

Ubuntu 18.04 LTS (Bionic Beaver) Ignored

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Notes

AuthorNote
seth-arnold
openssh-ssh1 is provided for compatibility with old devices that
cannot be upgraded to modern protocols. Thus we may not provide security
support for this package if doing so would prevent access to equipment.
The upstream OpenSSH developers see this as an important
security feature and do not intend to 'fix' it.

References