UBUNTU-CVE-2016-0739

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    UBUNTU-CVE-2016-0739

    Published: 23 Feb 2016Last Modified: 22 Apr 2026
    Upstream:
    CVE-2016-0739
    Aliases:
    USN-2912-1

    Summary:

    Details: libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

    References: https://ubuntu.com/security/CVE-2016-0739, https://www.libssh2.org/adv_20160223.html, https://www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/, https://ubuntu.com/security/notices/USN-2912-1, https://www.cve.org/CVERecord?id=CVE-2016-0739

    Affected packages

    Package

    Name: libssh

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.6.1-0ubuntu3.3

    Affected versions

    0.5.4-1

    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