UBUNTU-CVE-2016-20012

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    UBUNTU-CVE-2016-20012

    Published: 15 Sept 2021Last Modified: 16 Sept 2026
    Upstream:
    CVE-2016-20012

    Summary:

    Details: 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. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product

    References: https://ubuntu.com/security/CVE-2016-20012, https://github.com/openssh/openssh-portable/pull/270, https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265, https://rushter.com/blog/public-ssh-keys/, https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak, https://www.cve.org/CVERecord?id=CVE-2016-20012

    Affected packages

    Package

    Name: openssh

    Purl: pkg:deb/ubuntu/openssh?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1:6.2p2-6

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2016-20012 | CVE-DB